package decimal import ( "database/sql/driver" "encoding/json" "encoding/xml" "fmt" "math" "math/big" "math/rand" "reflect" "regexp" "strconv" "strings" "testing" "testing/quick" "time" ) type testEnt struct { float float64 short string exact string inexact string } var testTable = []*testEnt{ {3.141592653589793, "3.141592653589793", "", "3.14159265358979300000000000000000000000000000000000004"}, {3, "3", "", "3.0000000000000000000000002"}, {1234567890123456, "1234567890123456", "", "1234567890123456.00000000000000002"}, {1234567890123456000, "1234567890123456000", "", "1234567890123456000.0000000000000008"}, {1234.567890123456, "1234.567890123456", "", "1234.5678901234560000000000000009"}, {.1234567890123456, "0.1234567890123456", "", "0.12345678901234560000000000006"}, {0, "0", "", "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001"}, {.1111111111111110, "0.111111111111111", "", "0.111111111111111000000000000000009"}, {.1111111111111111, "0.1111111111111111", "", "0.111111111111111100000000000000000000023423545644534234"}, {.1111111111111119, "0.1111111111111119", "", "0.111111111111111900000000000000000000000000000000000134123984192834"}, {.000000000000000001, "0.000000000000000001", "", "0.00000000000000000100000000000000000000000000000000012341234"}, {.000000000000000002, "0.000000000000000002", "", "0.0000000000000000020000000000000000000012341234123"}, {.000000000000000003, "0.000000000000000003", "", "0.00000000000000000299999999999999999999999900000000000123412341234"}, {.000000000000000005, "0.000000000000000005", "", "0.00000000000000000500000000000000000023412341234"}, {.000000000000000008, "0.000000000000000008", "", "0.0000000000000000080000000000000000001241234432"}, {.1000000000000001, "0.1000000000000001", "", "0.10000000000000010000000000000012341234"}, {.1000000000000002, "0.1000000000000002", "", "0.10000000000000020000000000001234123412"}, {.1000000000000003, "0.1000000000000003", "", "0.1000000000000003000000000000001234123412"}, {.1000000000000005, "0.1000000000000005", "", "0.1000000000000005000000000000000006441234"}, {.1000000000000008, "0.1000000000000008", "", "0.100000000000000800000000000000000009999999999999999999999999999"}, {1e25, "10000000000000000000000000", "", ""}, {1.5e14, "150000000000000", "", ""}, {1.5e15, "1500000000000000", "", ""}, {1.5e16, "15000000000000000", "", ""}, {1.0001e25, "10001000000000000000000000", "", ""}, {1.0001000000000000033e25, "10001000000000000000000000", "", ""}, {2e25, "20000000000000000000000000", "", ""}, {4e25, "40000000000000000000000000", "", ""}, {8e25, "80000000000000000000000000", "", ""}, {1e250, "10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "", ""}, {2e250, "20000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "", ""}, {math.MaxInt64, strconv.FormatFloat(float64(math.MaxInt64), 'f', -1, 64), "", strconv.FormatInt(math.MaxInt64, 10)}, {1.29067116156722e-309, "0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000129067116156722", "", "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001290671161567218558822290567835270536800098852722416870074139002112543896676308448335063375297788379444685193974290737962187240854947838776604607190387984577130572928111657710645015086812756013489109884753559084166516937690932698276436869274093950997935137476803610007959500457935217950764794724766740819156974617155861568214427828145972181876775307023388139991104942469299524961281641158436752347582767153796914843896176260096039358494077706152272661453132497761307744086665088096215425146090058519888494342944692629602847826300550628670375451325582843627504604013541465361435761965354140678551369499812124085312128659002910905639984075064968459581691226705666561364681985266583563078466180095375402399087817404368974165082030458595596655868575908243656158447265625000000000000000000000000000000000000004440000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}, // go Issue 29491. {498484681984085570, "498484681984085570", "", ""}, {5.8339553793802237e+23, "583395537938022370000000", "", ""}, } var testTableScientificNotation = map[string]string{ "1e9": "1000000000", "2.41E-3": "0.00241", "24.2E-4": "0.00242", "243E-5": "0.00243", "1e-5": "0.00001", "245E3": "245000", "1.2345E-1": "0.12345", "0e5": "0", "0e-5": "0", "0.e0": "0", ".0e0": "0", "123.456e0": "123.456", "123.456e2": "12345.6", "123.456e10": "1234560000000", } func init() { for _, s := range testTable { s.exact = strconv.FormatFloat(s.float, 'f', 1500, 64) if strings.ContainsRune(s.exact, '.') { s.exact = strings.TrimRight(s.exact, "0") s.exact = strings.TrimRight(s.exact, ".") } } // add negatives withNeg := testTable[:] for _, s := range testTable { if s.float > 0 && s.short != "0" && s.exact != "0" { withNeg = append(withNeg, &testEnt{-s.float, "-" + s.short, "-" + s.exact, "-" + s.inexact}) } } testTable = withNeg for e, s := range testTableScientificNotation { if string(e[0]) != "-" && s != "0" { testTableScientificNotation["-"+e] = "-" + s } } } func TestNewFromFloat(t *testing.T) { for _, x := range testTable { s := x.short d := NewFromFloat(x.float) if d.String() != s { t.Errorf("expected %s, got %s (float: %v) (%s, %d)", s, d.String(), x.float, d.value.String(), d.exp) } } shouldPanicOn := []float64{ math.NaN(), math.Inf(1), math.Inf(-1), } for _, n := range shouldPanicOn { var d Decimal if !didPanic(func() { d = NewFromFloat(n) }) { t.Fatalf("Expected panic when creating a Decimal from %v, got %v instead", n, d.String()) } } } func TestNewFromFloatRandom(t *testing.T) { n := 0 rng := rand.New(rand.NewSource(0xdead1337)) for { n++ if n == 10 { break } in := (rng.Float64() - 0.5) * math.MaxFloat64 * 2 want, err := NewFromString(strconv.FormatFloat(in, 'f', -1, 64)) if err != nil { t.Error(err) continue } got := NewFromFloat(in) if !want.Equal(got) { t.Errorf("in: %v, expected %s (%s, %d), got %s (%s, %d) ", in, want.String(), want.value.String(), want.exp, got.String(), got.value.String(), got.exp) } } } func TestNewFromFloatQuick(t *testing.T) { err := quick.Check(func(f float64) bool { want, werr := NewFromString(strconv.FormatFloat(f, 'f', -1, 64)) if werr != nil { return true } got := NewFromFloat(f) return got.Equal(want) }, &quick.Config{}) if err != nil { t.Error(err) } } func TestNewFromFloat32Random(t *testing.T) { n := 0 rng := rand.New(rand.NewSource(0xdead1337)) for { n++ if n == 10 { break } in := float32((rng.Float64() - 0.5) * math.MaxFloat32 * 2) want, err := NewFromString(strconv.FormatFloat(float64(in), 'f', -1, 32)) if err != nil { t.Error(err) continue } got := NewFromFloat32(in) if !want.Equal(got) { t.Errorf("in: %v, expected %s (%s, %d), got %s (%s, %d) ", in, want.String(), want.value.String(), want.exp, got.String(), got.value.String(), got.exp) } } } func TestNewFromFloat32Quick(t *testing.T) { err := quick.Check(func(f float32) bool { want, werr := NewFromString(strconv.FormatFloat(float64(f), 'f', -1, 32)) if werr != nil { return true } got := NewFromFloat32(f) return got.Equal(want) }, &quick.Config{}) if err != nil { t.Error(err) } } func TestNewFromString(t *testing.T) { for _, x := range testTable { s := x.short d, err := NewFromString(s) if err != nil { t.Errorf("error while parsing %s", s) } else if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } for _, x := range testTable { s := x.exact d, err := NewFromString(s) if err != nil { t.Errorf("error while parsing %s", s) } else if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } for e, s := range testTableScientificNotation { d, err := NewFromString(e) if err != nil { t.Errorf("error while parsing %s", e) } else if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } } func TestNewFromFormattedString(t *testing.T) { for _, testCase := range []struct { Formatted string Expected string ReplRegex *regexp.Regexp }{ {"$10.99", "10.99", regexp.MustCompile("[$]")}, {"$ 12.1", "12.1", regexp.MustCompile("[$\\s]")}, {"$61,690.99", "61690.99", regexp.MustCompile("[$,]")}, {"1_000_000.00", "1000000.00", regexp.MustCompile("[_]")}, {"41,410.00", "41410.00", regexp.MustCompile("[,]")}, {"5200 USD", "5200", regexp.MustCompile("[USD\\s]")}, } { dFormatted, err := NewFromFormattedString(testCase.Formatted, testCase.ReplRegex) if err != nil { t.Fatal(err) } dExact, err := NewFromString(testCase.Expected) if err != nil { t.Fatal(err) } if !dFormatted.Equal(dExact) { t.Errorf("expect %s, got %s", dExact, dFormatted) } } } func TestFloat64(t *testing.T) { for _, x := range testTable { if x.inexact == "" || x.inexact == "-" { continue } s := x.exact d, err := NewFromString(s) if err != nil { t.Errorf("error while parsing %s", s) } else if f, exact := d.Float64(); !exact || f != x.float { t.Errorf("cannot represent exactly %s", s) } s = x.inexact d, err = NewFromString(s) if err != nil { t.Errorf("error while parsing %s", s) } else if f, exact := d.Float64(); exact || f != x.float { t.Errorf("%s should be represented inexactly", s) } } } func TestNewFromStringErrs(t *testing.T) { tests := []string{ "", "qwert", "-", ".", "-.", ".-", "234-.56", "234-56", "2-", "..", "2..", "..2", ".5.2", "8..2", "8.1.", "1e", "1-e", "1e9e", "1ee9", "1ee", "1eE", "1e-", "1e-.", "1e1.2", "123.456e1.3", "1e-1.2", "123.456e-1.3", "123.456Easdf", "123.456e" + strconv.FormatInt(math.MinInt64, 10), "123.456e" + strconv.FormatInt(math.MinInt32, 10), "512.99 USD", "$99.99", "51,850.00", "20_000_000.00", "$20_000_000.00", } for _, s := range tests { _, err := NewFromString(s) if err == nil { t.Errorf("error expected when parsing %s", s) } } } func TestNewFromStringDeepEquals(t *testing.T) { type StrCmp struct { str1 string str2 string expected bool } tests := []StrCmp{ {"1", "1", true}, {"1.0", "1.0", true}, {"10", "10.0", false}, {"1.1", "1.10", false}, {"1.001", "1.01", false}, } for _, cmp := range tests { d1, err1 := NewFromString(cmp.str1) d2, err2 := NewFromString(cmp.str2) if err1 != nil || err2 != nil { t.Errorf("error parsing strings to decimals") } if reflect.DeepEqual(d1, d2) != cmp.expected { t.Errorf("comparison result is different from expected results for %s and %s", cmp.str1, cmp.str2) } } } func TestRequireFromString(t *testing.T) { s := "1.23" defer func() { err := recover() if err != nil { t.Errorf("error while parsing %s", s) } }() d := RequireFromString(s) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } func TestRequireFromStringErrs(t *testing.T) { s := "qwert" var d Decimal var err interface{} func(d Decimal) { defer func() { err = recover() }() RequireFromString(s) }(d) if err == nil { t.Errorf("panic expected when parsing %s", s) } } func TestNewFromFloatWithExponent(t *testing.T) { type Inp struct { float float64 exp int32 } // some tests are taken from here https://www.cockroachlabs.com/blog/rounding-implementations-in-go/ tests := map[Inp]string{ Inp{123.4, -3}: "123.4", Inp{123.4, -1}: "123.4", Inp{123.412345, 1}: "120", Inp{123.412345, 0}: "123", Inp{123.412345, -5}: "123.41235", Inp{123.412345, -6}: "123.412345", Inp{123.412345, -7}: "123.412345", Inp{123.412345, -28}: "123.4123450000000019599610823207", Inp{1230000000, 3}: "1230000000", Inp{123.9999999999999999, -7}: "124", Inp{123.8989898999999999, -7}: "123.8989899", Inp{0.49999999999999994, 0}: "0", Inp{0.5, 0}: "1", Inp{0., -1000}: "0", Inp{0.5000000000000001, 0}: "1", Inp{1.390671161567e-309, 0}: "0", Inp{4.503599627370497e+15, 0}: "4503599627370497", Inp{4.503599627370497e+60, 0}: "4503599627370497110902645731364739935039854989106233267453952", Inp{4.503599627370497e+60, 1}: "4503599627370497110902645731364739935039854989106233267453950", Inp{4.503599627370497e+60, -1}: "4503599627370497110902645731364739935039854989106233267453952", Inp{50, 2}: "100", Inp{49, 2}: "0", Inp{50, 3}: "0", // subnormals Inp{1.390671161567e-309, -2000}: "0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001390671161567000864431395448332752540137009987788957394095829635554502771758698872408926974382819387852542087331897381878220271350970912568035007740861074263206736245957501456549756342151614772544950978154339064833880234531754156635411349342950306987480369774780312897442981323940546749863054846093718407237782253156822124910364044261653195961209878120072488178603782495270845071470243842997312255994555557251870400944414666445871039673491570643357351279578519863428540219295076767898526278029257129758694673164251056158277568765100904638511604478844087596428177947970563689475826736810456067108202083804368114484417399279328807983736233036662284338182105684628835292230438999173947056675615385756827890872955322265625", Inp{1.390671161567e-309, -862}: "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013906711615670008644313954483327525401370099877889573940958296355545027717586988724089269743828193878525420873318973818782202713509709125680350077408610742632067362459575014565497563421516147725449509781543390648338802345317541566354113493429503069874803697747803128974429813239405467498630548460937184072377822531568221249103640442616531959612098781200724881786037824952708450714702438429973122559945555572518704009444146664458710396734915706433573512795785198634285402192950767678985262780292571297586946731642510561582775687651009046385116044788440876", Inp{1.390671161567e-309, -863}: "0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000013906711615670008644313954483327525401370099877889573940958296355545027717586988724089269743828193878525420873318973818782202713509709125680350077408610742632067362459575014565497563421516147725449509781543390648338802345317541566354113493429503069874803697747803128974429813239405467498630548460937184072377822531568221249103640442616531959612098781200724881786037824952708450714702438429973122559945555572518704009444146664458710396734915706433573512795785198634285402192950767678985262780292571297586946731642510561582775687651009046385116044788440876", } // add negatives for p, s := range tests { if p.float > 0 { if s != "0" { tests[Inp{-p.float, p.exp}] = "-" + s } else { tests[Inp{-p.float, p.exp}] = "0" } } } for input, s := range tests { d := NewFromFloatWithExponent(input.float, input.exp) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } shouldPanicOn := []float64{ math.NaN(), math.Inf(1), math.Inf(-1), } for _, n := range shouldPanicOn { var d Decimal if !didPanic(func() { d = NewFromFloatWithExponent(n, 0) }) { t.Fatalf("Expected panic when creating a Decimal from %v, got %v instead", n, d.String()) } } } func TestNewFromInt(t *testing.T) { tests := map[int64]string{ 0: "0", 1: "1", 323412345: "323412345", 9223372036854775807: "9223372036854775807", } // add negatives for p, s := range tests { if p > 0 { tests[-p] = "-" + s } } for input, s := range tests { d := NewFromInt(input) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } } func TestNewFromInt32(t *testing.T) { tests := map[int32]string{ 0: "0", 1: "1", 323412345: "323412345", 2147483647: "2147483647", } // add negatives for p, s := range tests { if p > 0 { tests[-p] = "-" + s } } for input, s := range tests { d := NewFromInt32(input) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } } func TestNewFromBigIntWithExponent(t *testing.T) { type Inp struct { val *big.Int exp int32 } tests := map[Inp]string{ Inp{big.NewInt(123412345), -3}: "123412.345", Inp{big.NewInt(2234), -1}: "223.4", Inp{big.NewInt(323412345), 1}: "3234123450", Inp{big.NewInt(423412345), 0}: "423412345", Inp{big.NewInt(52341235), -5}: "523.41235", Inp{big.NewInt(623412345), -6}: "623.412345", Inp{big.NewInt(723412345), -7}: "72.3412345", } // add negatives for p, s := range tests { if p.val.Cmp(Zero.value) > 0 { tests[Inp{p.val.Neg(p.val), p.exp}] = "-" + s } } for input, s := range tests { d := NewFromBigInt(input.val, input.exp) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } } } func TestJSON(t *testing.T) { for _, x := range testTable { s := x.short var doc struct { Amount Decimal `json:"amount"` } docStr := `{"amount":"` + s + `"}` docStrNumber := `{"amount":` + s + `}` err := json.Unmarshal([]byte(docStr), &doc) if err != nil { t.Errorf("error unmarshaling %s: %v", docStr, err) } else if doc.Amount.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, doc.Amount.String(), doc.Amount.value.String(), doc.Amount.exp) } out, err := json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != docStr { t.Errorf("expected %s, got %s", docStr, string(out)) } // make sure unquoted marshalling works too MarshalJSONWithoutQuotes = true out, err = json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != docStrNumber { t.Errorf("expected %s, got %s", docStrNumber, string(out)) } MarshalJSONWithoutQuotes = false } } func TestUnmarshalJSONNull(t *testing.T) { var doc struct { Amount Decimal `json:"amount"` } docStr := `{"amount": null}` err := json.Unmarshal([]byte(docStr), &doc) if err != nil { t.Errorf("error unmarshaling %s: %v", docStr, err) } else if !doc.Amount.Equal(Zero) { t.Errorf("expected Zero, got %s (%s, %d)", doc.Amount.String(), doc.Amount.value.String(), doc.Amount.exp) } } func TestBadJSON(t *testing.T) { for _, testCase := range []string{ "]o_o[", "{", `{"amount":""`, `{"amount":""}`, `{"amount":"nope"}`, `0.333`, } { var doc struct { Amount Decimal `json:"amount"` } err := json.Unmarshal([]byte(testCase), &doc) if err == nil { t.Errorf("expected error, got %+v", doc) } } } func TestNullDecimalJSON(t *testing.T) { for _, x := range testTable { s := x.short var doc struct { Amount NullDecimal `json:"amount"` } docStr := `{"amount":"` + s + `"}` docStrNumber := `{"amount":` + s + `}` err := json.Unmarshal([]byte(docStr), &doc) if err != nil { t.Errorf("error unmarshaling %s: %v", docStr, err) } else { if !doc.Amount.Valid { t.Errorf("expected %s to be valid (not NULL), got Valid = false", s) } if doc.Amount.Decimal.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, doc.Amount.Decimal.String(), doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp) } } out, err := json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != docStr { t.Errorf("expected %s, got %s", docStr, string(out)) } // make sure unquoted marshalling works too MarshalJSONWithoutQuotes = true out, err = json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != docStrNumber { t.Errorf("expected %s, got %s", docStrNumber, string(out)) } MarshalJSONWithoutQuotes = false } var doc struct { Amount NullDecimal `json:"amount"` } docStr := `{"amount": null}` err := json.Unmarshal([]byte(docStr), &doc) if err != nil { t.Errorf("error unmarshaling %s: %v", docStr, err) } else if doc.Amount.Valid { t.Errorf("expected null value to have Valid = false, got Valid = true and Decimal = %s (%s, %d)", doc.Amount.Decimal.String(), doc.Amount.Decimal.value.String(), doc.Amount.Decimal.exp) } expected := `{"amount":null}` out, err := json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != expected { t.Errorf("expected %s, got %s", expected, string(out)) } // make sure unquoted marshalling works too MarshalJSONWithoutQuotes = true expectedUnquoted := `{"amount":null}` out, err = json.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != expectedUnquoted { t.Errorf("expected %s, got %s", expectedUnquoted, string(out)) } MarshalJSONWithoutQuotes = false } func TestNullDecimalBadJSON(t *testing.T) { for _, testCase := range []string{ "]o_o[", "{", `{"amount":""`, `{"amount":""}`, `{"amount":"nope"}`, `{"amount":nope}`, `0.333`, } { var doc struct { Amount NullDecimal `json:"amount"` } err := json.Unmarshal([]byte(testCase), &doc) if err == nil { t.Errorf("expected error, got %+v", doc) } } } func TestXML(t *testing.T) { for _, x := range testTable { s := x.short var doc struct { XMLName xml.Name `xml:"account"` Amount Decimal `xml:"amount"` } docStr := `` + s + `` err := xml.Unmarshal([]byte(docStr), &doc) if err != nil { t.Errorf("error unmarshaling %s: %v", docStr, err) } else if doc.Amount.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, doc.Amount.String(), doc.Amount.value.String(), doc.Amount.exp) } out, err := xml.Marshal(&doc) if err != nil { t.Errorf("error marshaling %+v: %v", doc, err) } else if string(out) != docStr { t.Errorf("expected %s, got %s", docStr, string(out)) } } } func TestBadXML(t *testing.T) { for _, testCase := range []string{ "o_o", "7", ``, ``, `nope`, `0.333`, } { var doc struct { XMLName xml.Name `xml:"account"` Amount Decimal `xml:"amount"` } err := xml.Unmarshal([]byte(testCase), &doc) if err == nil { t.Errorf("expected error, got %+v", doc) } } } func TestDecimal_rescale(t *testing.T) { type Inp struct { int int64 exp int32 rescale int32 } tests := map[Inp]string{ Inp{1234, -3, -5}: "1.234", Inp{1234, -3, 0}: "1", Inp{1234, 3, 0}: "1234000", Inp{1234, -4, -4}: "0.1234", } // add negatives for p, s := range tests { if p.int > 0 { tests[Inp{-p.int, p.exp, p.rescale}] = "-" + s } } for input, s := range tests { d := New(input.int, input.exp).rescale(input.rescale) if d.String() != s { t.Errorf("expected %s, got %s (%s, %d)", s, d.String(), d.value.String(), d.exp) } // test StringScaled s2 := New(input.int, input.exp).StringScaled(input.rescale) if s2 != s { t.Errorf("expected %s, got %s", s, s2) } } } func TestDecimal_Floor(t *testing.T) { assertFloor := func(input, expected Decimal) { got := input.Floor() if !got.Equal(expected) { t.Errorf("Floor(%s): got %s, expected %s", input, got, expected) } } type testDataString struct { input string expected string } testsWithStrings := []testDataString{ {"1.999", "1"}, {"1", "1"}, {"1.01", "1"}, {"0", "0"}, {"0.9", "0"}, {"0.1", "0"}, {"-0.9", "-1"}, {"-0.1", "-1"}, {"-1.00", "-1"}, {"-1.01", "-2"}, {"-1.999", "-2"}, } for _, test := range testsWithStrings { expected, _ := NewFromString(test.expected) input, _ := NewFromString(test.input) assertFloor(input, expected) } type testDataDecimal struct { input Decimal expected string } testsWithDecimals := []testDataDecimal{ {New(100, -1), "10"}, {New(10, 0), "10"}, {New(1, 1), "10"}, {New(1999, -3), "1"}, {New(101, -2), "1"}, {New(1, 0), "1"}, {New(0, 0), "0"}, {New(9, -1), "0"}, {New(1, -1), "0"}, {New(-1, -1), "-1"}, {New(-9, -1), "-1"}, {New(-1, 0), "-1"}, {New(-101, -2), "-2"}, {New(-1999, -3), "-2"}, } for _, test := range testsWithDecimals { expected, _ := NewFromString(test.expected) assertFloor(test.input, expected) } } func TestDecimal_Ceil(t *testing.T) { assertCeil := func(input, expected Decimal) { got := input.Ceil() if !got.Equal(expected) { t.Errorf("Ceil(%s): got %s, expected %s", input, got, expected) } } type testDataString struct { input string expected string } testsWithStrings := []testDataString{ {"1.999", "2"}, {"1", "1"}, {"1.01", "2"}, {"0", "0"}, {"0.9", "1"}, {"0.1", "1"}, {"-0.9", "0"}, {"-0.1", "0"}, {"-1.00", "-1"}, {"-1.01", "-1"}, {"-1.999", "-1"}, } for _, test := range testsWithStrings { expected, _ := NewFromString(test.expected) input, _ := NewFromString(test.input) assertCeil(input, expected) } type testDataDecimal struct { input Decimal expected string } testsWithDecimals := []testDataDecimal{ {New(100, -1), "10"}, {New(10, 0), "10"}, {New(1, 1), "10"}, {New(1999, -3), "2"}, {New(101, -2), "2"}, {New(1, 0), "1"}, {New(0, 0), "0"}, {New(9, -1), "1"}, {New(1, -1), "1"}, {New(-1, -1), "0"}, {New(-9, -1), "0"}, {New(-1, 0), "-1"}, {New(-101, -2), "-1"}, {New(-1999, -3), "-1"}, } for _, test := range testsWithDecimals { expected, _ := NewFromString(test.expected) assertCeil(test.input, expected) } } func TestDecimal_RoundAndStringFixed(t *testing.T) { type testData struct { input string places int32 expected string expectedFixed string } tests := []testData{ {"1.454", 0, "1", ""}, {"1.454", 1, "1.5", ""}, {"1.454", 2, "1.45", ""}, {"1.454", 3, "1.454", ""}, {"1.454", 4, "1.454", "1.4540"}, {"1.454", 5, "1.454", "1.45400"}, {"1.554", 0, "2", ""}, {"1.554", 1, "1.6", ""}, {"1.554", 2, "1.55", ""}, {"0.554", 0, "1", ""}, {"0.454", 0, "0", ""}, {"0.454", 5, "0.454", "0.45400"}, {"0", 0, "0", ""}, {"0", 1, "0", "0.0"}, {"0", 2, "0", "0.00"}, {"0", -1, "0", ""}, {"5", 2, "5", "5.00"}, {"5", 1, "5", "5.0"}, {"5", 0, "5", ""}, {"500", 2, "500", "500.00"}, {"545", -1, "550", ""}, {"545", -2, "500", ""}, {"545", -3, "1000", ""}, {"545", -4, "0", ""}, {"499", -3, "0", ""}, {"499", -4, "0", ""}, } // add negative number tests for _, test := range tests { expected := test.expected if expected != "0" { expected = "-" + expected } expectedStr := test.expectedFixed if strings.ContainsAny(expectedStr, "123456789") && expectedStr != "" { expectedStr = "-" + expectedStr } tests = append(tests, testData{"-" + test.input, test.places, expected, expectedStr}) } for _, test := range tests { d, err := NewFromString(test.input) if err != nil { t.Fatal(err) } // test Round expected, err := NewFromString(test.expected) if err != nil { t.Fatal(err) } got := d.Round(test.places) if !got.Equal(expected) { t.Errorf("Rounding %s to %d places, got %s, expected %s", d, test.places, got, expected) } // test StringFixed if test.expectedFixed == "" { test.expectedFixed = test.expected } gotStr := d.StringFixed(test.places) if gotStr != test.expectedFixed { t.Errorf("(%s).StringFixed(%d): got %s, expected %s", d, test.places, gotStr, test.expectedFixed) } } } func TestDecimal_RoundUpAndStringFixed(t *testing.T) { type testData struct { input string places int32 expected string expectedFixed string } tests := []testData{ {"1.454", 0, "2", ""}, {"1.454", 1, "1.5", ""}, {"1.454", 2, "1.46", ""}, {"1.454", 3, "1.454", ""}, {"1.454", 4, "1.454", "1.4540"}, {"1.454", 5, "1.454", "1.45400"}, {"1.554", 0, "2", ""}, {"1.554", 1, "1.6", ""}, {"1.554", 2, "1.56", ""}, {"0.554", 0, "1", ""}, {"0.454", 0, "1", ""}, {"0.454", 5, "0.454", "0.45400"}, {"0", 0, "0", ""}, {"0", 1, "0", "0.0"}, {"0", 2, "0", "0.00"}, {"0", -1, "0", ""}, {"5", 2, "5", "5.00"}, {"5", 1, "5", "5.0"}, {"5", 0, "5", ""}, {"500", 2, "500", "500.00"}, {"545", -1, "550", ""}, {"545", -2, "600", ""}, {"545", -3, "1000", ""}, {"545", -4, "10000", ""}, {"499", -3, "1000", ""}, {"499", -4, "10000", ""}, {"1.1001", 2, "1.11", ""}, {"-1.1001", 2, "-1.10", ""}, {"-1.454", 0, "-1", ""}, {"-1.454", 1, "-1.4", ""}, {"-1.454", 2, "-1.45", ""}, {"-1.454", 3, "-1.454", ""}, {"-1.454", 4, "-1.454", "-1.4540"}, {"-1.454", 5, "-1.454", "-1.45400"}, {"-1.554", 0, "-1", ""}, {"-1.554", 1, "-1.5", ""}, {"-1.554", 2, "-1.55", ""}, {"-0.554", 0, "0", ""}, {"-0.454", 0, "0", ""}, {"-0.454", 5, "-0.454", "-0.45400"}, {"-5", 2, "-5", "-5.00"}, {"-5", 1, "-5", "-5.0"}, {"-5", 0, "-5", ""}, {"-500", 2, "-500", "-500.00"}, {"-545", -1, "-540", ""}, {"-545", -2, "-500", ""}, {"-545", -3, "0", ""}, {"-545", -4, "0", ""}, {"-499", -3, "0", ""}, {"-499", -4, "0", ""}, } for _, test := range tests { d, err := NewFromString(test.input) if err != nil { t.Fatal(err) } // test Round expected, err := NewFromString(test.expected) if err != nil { t.Fatal(err) } got := d.RoundUp(test.places) if !got.Equal(expected) { t.Errorf("Rounding up %s to %d places, got %s, expected %s", d, test.places, got, expected) } // test StringFixed if test.expectedFixed == "" { test.expectedFixed = test.expected } gotStr := got.StringFixed(test.places) if gotStr != test.expectedFixed { t.Errorf("(%s).StringFixed(%d): got %s, expected %s", d, test.places, gotStr, test.expectedFixed) } } } func TestDecimal_RoundDownAndStringFixed(t *testing.T) { type testData struct { input string places int32 expected string expectedFixed string } tests := []testData{ {"1.454", 0, "1", ""}, {"1.454", 1, "1.4", ""}, {"1.454", 2, "1.45", ""}, {"1.454", 3, "1.454", ""}, {"1.454", 4, "1.454", "1.4540"}, {"1.454", 5, "1.454", "1.45400"}, {"1.554", 0, "1", ""}, {"1.554", 1, "1.5", ""}, {"1.554", 2, "1.55", ""}, {"0.554", 0, "0", ""}, {"0.454", 0, "0", ""}, {"0.454", 5, "0.454", "0.45400"}, {"0", 0, "0", ""}, {"0", 1, "0", "0.0"}, {"0", 2, "0", "0.00"}, {"0", -1, "0", ""}, {"5", 2, "5", "5.00"}, {"5", 1, "5", "5.0"}, {"5", 0, "5", ""}, {"500", 2, "500", "500.00"}, {"545", -1, "540", ""}, {"545", -2, "500", ""}, {"545", -3, "0", ""}, {"545", -4, "0", ""}, {"499", -3, "0", ""}, {"499", -4, "0", ""}, {"1.1001", 2, "1.10", ""}, {"-1.1001", 2, "-1.11", ""}, {"-1.454", 0, "-2", ""}, {"-1.454", 1, "-1.5", ""}, {"-1.454", 2, "-1.46", ""}, {"-1.454", 3, "-1.454", ""}, {"-1.454", 4, "-1.454", "-1.4540"}, {"-1.454", 5, "-1.454", "-1.45400"}, {"-1.554", 0, "-2", ""}, {"-1.554", 1, "-1.6", ""}, {"-1.554", 2, "-1.56", ""}, {"-0.554", 0, "-1", ""}, {"-0.454", 0, "-1", ""}, {"-0.454", 5, "-0.454", "-0.45400"}, {"-5", 2, "-5", "-5.00"}, {"-5", 1, "-5", "-5.0"}, {"-5", 0, "-5", ""}, {"-500", 2, "-500", "-500.00"}, {"-545", -1, "-550", ""}, {"-545", -2, "-600", ""}, {"-545", -3, "-1000", ""}, {"-545", -4, "-10000", ""}, {"-499", -3, "-1000", ""}, {"-499", -4, "-10000", ""}, } for _, test := range tests { d, err := NewFromString(test.input) if err != nil { t.Fatal(err) } // test Round expected, err := NewFromString(test.expected) if err != nil { t.Fatal(err) } got := d.RoundDown(test.places) if !got.Equal(expected) { t.Errorf("Rounding down %s to %d places, got %s, expected %s", d, test.places, got, expected) } // test StringFixed if test.expectedFixed == "" { test.expectedFixed = test.expected } gotStr := got.StringFixed(test.places) if gotStr != test.expectedFixed { t.Errorf("(%s).StringFixed(%d): got %s, expected %s", d, test.places, gotStr, test.expectedFixed) } } } func TestDecimal_BankRoundAndStringFixed(t *testing.T) { type testData struct { input string places int32 expected string expectedFixed string } tests := []testData{ {"1.454", 0, "1", ""}, {"1.454", 1, "1.5", ""}, {"1.454", 2, "1.45", ""}, {"1.454", 3, "1.454", ""}, {"1.454", 4, "1.454", "1.4540"}, {"1.454", 5, "1.454", "1.45400"}, {"1.554", 0, "2", ""}, {"1.554", 1, "1.6", ""}, {"1.554", 2, "1.55", ""}, {"0.554", 0, "1", ""}, {"0.454", 0, "0", ""}, {"0.454", 5, "0.454", "0.45400"}, {"0", 0, "0", ""}, {"0", 1, "0", "0.0"}, {"0", 2, "0", "0.00"}, {"0", -1, "0", ""}, {"5", 2, "5", "5.00"}, {"5", 1, "5", "5.0"}, {"5", 0, "5", ""}, {"500", 2, "500", "500.00"}, {"545", -2, "500", ""}, {"545", -3, "1000", ""}, {"545", -4, "0", ""}, {"499", -3, "0", ""}, {"499", -4, "0", ""}, {"1.45", 1, "1.4", ""}, {"1.55", 1, "1.6", ""}, {"1.65", 1, "1.6", ""}, {"545", -1, "540", ""}, {"565", -1, "560", ""}, {"555", -1, "560", ""}, } // add negative number tests for _, test := range tests { expected := test.expected if expected != "0" { expected = "-" + expected } expectedStr := test.expectedFixed if strings.ContainsAny(expectedStr, "123456789") && expectedStr != "" { expectedStr = "-" + expectedStr } tests = append(tests, testData{"-" + test.input, test.places, expected, expectedStr}) } for _, test := range tests { d, err := NewFromString(test.input) if err != nil { panic(err) } // test Round expected, err := NewFromString(test.expected) if err != nil { panic(err) } got := d.RoundBank(test.places) if !got.Equal(expected) { t.Errorf("Bank Rounding %s to %d places, got %s, expected %s", d, test.places, got, expected) } // test StringFixed if test.expectedFixed == "" { test.expectedFixed = test.expected } gotStr := d.StringFixedBank(test.places) if gotStr != test.expectedFixed { t.Errorf("(%s).StringFixed(%d): got %s, expected %s", d, test.places, gotStr, test.expectedFixed) } } } func TestDecimal_Uninitialized(t *testing.T) { a := Decimal{} b := Decimal{} decs := []Decimal{ a, a.rescale(10), a.Abs(), a.Add(b), a.Sub(b), a.Mul(b), a.Shift(0), a.Div(New(1, -1)), a.Round(2), a.Floor(), a.Ceil(), a.Truncate(2), } for _, d := range decs { if d.String() != "0" { t.Errorf("expected 0, got %s", d.String()) } if d.StringFixed(3) != "0.000" { t.Errorf("expected 0, got %s", d.StringFixed(3)) } if d.StringScaled(-2) != "0" { t.Errorf("expected 0, got %s", d.StringScaled(-2)) } } if a.Cmp(b) != 0 { t.Errorf("a != b") } if a.Sign() != 0 { t.Errorf("a.Sign() != 0") } if a.Exponent() != 0 { t.Errorf("a.Exponent() != 0") } if a.IntPart() != 0 { t.Errorf("a.IntPar() != 0") } f, _ := a.Float64() if f != 0 { t.Errorf("a.Float64() != 0") } if a.Rat().RatString() != "0" { t.Errorf("a.Rat() != 0, got %s", a.Rat().RatString()) } } func TestDecimal_Add(t *testing.T) { type Inp struct { a string b string } inputs := map[Inp]string{ Inp{"2", "3"}: "5", Inp{"2454495034", "3451204593"}: "5905699627", Inp{"24544.95034", ".3451204593"}: "24545.2954604593", Inp{".1", ".1"}: "0.2", Inp{".1", "-.1"}: "0", Inp{"0", "1.001"}: "1.001", } for inp, res := range inputs { a, err := NewFromString(inp.a) if err != nil { t.FailNow() } b, err := NewFromString(inp.b) if err != nil { t.FailNow() } c := a.Add(b) if c.String() != res { t.Errorf("expected %s, got %s", res, c.String()) } } } func TestDecimal_Sub(t *testing.T) { type Inp struct { a string b string } inputs := map[Inp]string{ Inp{"2", "3"}: "-1", Inp{"12", "3"}: "9", Inp{"-2", "9"}: "-11", Inp{"2454495034", "3451204593"}: "-996709559", Inp{"24544.95034", ".3451204593"}: "24544.6052195407", Inp{".1", "-.1"}: "0.2", Inp{".1", ".1"}: "0", Inp{"0", "1.001"}: "-1.001", Inp{"1.001", "0"}: "1.001", Inp{"2.3", ".3"}: "2", } for inp, res := range inputs { a, err := NewFromString(inp.a) if err != nil { t.FailNow() } b, err := NewFromString(inp.b) if err != nil { t.FailNow() } c := a.Sub(b) if c.String() != res { t.Errorf("expected %s, got %s", res, c.String()) } } } func TestDecimal_Neg(t *testing.T) { inputs := map[string]string{ "0": "0", "10": "-10", "5.56": "-5.56", "-10": "10", "-5.56": "5.56", } for inp, res := range inputs { a, err := NewFromString(inp) if err != nil { t.FailNow() } b := a.Neg() if b.String() != res { t.Errorf("expected %s, got %s", res, b.String()) } } } func TestDecimal_NegFromEmpty(t *testing.T) { a := Decimal{} b := a.Neg() if b.String() != "0" { t.Errorf("expected %s, got %s", "0", b) } } func TestDecimal_Mul(t *testing.T) { type Inp struct { a string b string } inputs := map[Inp]string{ Inp{"2", "3"}: "6", Inp{"2454495034", "3451204593"}: "8470964534836491162", Inp{"24544.95034", ".3451204593"}: "8470.964534836491162", Inp{".1", ".1"}: "0.01", Inp{"0", "1.001"}: "0", } for inp, res := range inputs { a, err := NewFromString(inp.a) if err != nil { t.FailNow() } b, err := NewFromString(inp.b) if err != nil { t.FailNow() } c := a.Mul(b) if c.String() != res { t.Errorf("expected %s, got %s", res, c.String()) } } // positive scale c := New(1234, 5).Mul(New(45, -1)) if c.String() != "555300000" { t.Errorf("Expected %s, got %s", "555300000", c.String()) } } func TestDecimal_Shift(t *testing.T) { type Inp struct { a string b int32 } inputs := map[Inp]string{ Inp{"6", 3}: "6000", Inp{"10", -2}: "0.1", Inp{"2.2", 1}: "22", Inp{"-2.2", -1}: "-0.22", Inp{"12.88", 5}: "1288000", Inp{"-10234274355545544493", -3}: "-10234274355545544.493", Inp{"-4612301402398.4753343454", 5}: "-461230140239847533.43454", } for inp, expectedStr := range inputs { num, _ := NewFromString(inp.a) got := num.Shift(inp.b) expected, _ := NewFromString(expectedStr) if !got.Equal(expected) { t.Errorf("expected %v when shifting %v by %v, got %v", expected, num, inp.b, got) } } } func TestDecimal_Div(t *testing.T) { type Inp struct { a string b string } inputs := map[Inp]string{ Inp{"6", "3"}: "2", Inp{"10", "2"}: "5", Inp{"2.2", "1.1"}: "2", Inp{"-2.2", "-1.1"}: "2", Inp{"12.88", "5.6"}: "2.3", Inp{"1023427554493", "43432632"}: "23563.5628642767953828", // rounded Inp{"1", "434324545566634"}: "0.0000000000000023", Inp{"1", "3"}: "0.3333333333333333", Inp{"2", "3"}: "0.6666666666666667", // rounded Inp{"10000", "3"}: "3333.3333333333333333", Inp{"10234274355545544493", "-3"}: "-3411424785181848164.3333333333333333", Inp{"-4612301402398.4753343454", "23.5"}: "-196268144782.9138440146978723", } for inp, expectedStr := range inputs { num, err := NewFromString(inp.a) if err != nil { t.FailNow() } denom, err := NewFromString(inp.b) if err != nil { t.FailNow() } got := num.Div(denom) expected, _ := NewFromString(expectedStr) if !got.Equal(expected) { t.Errorf("expected %v when dividing %v by %v, got %v", expected, num, denom, got) } got2 := num.DivRound(denom, int32(DivisionPrecision)) if !got2.Equal(expected) { t.Errorf("expected %v on DivRound (%v,%v), got %v", expected, num, denom, got2) } } type Inp2 struct { n int64 exp int32 n2 int64 exp2 int32 } // test code path where exp > 0 inputs2 := map[Inp2]string{ Inp2{124, 10, 3, 1}: "41333333333.3333333333333333", Inp2{124, 10, 3, 0}: "413333333333.3333333333333333", Inp2{124, 10, 6, 1}: "20666666666.6666666666666667", Inp2{124, 10, 6, 0}: "206666666666.6666666666666667", Inp2{10, 10, 10, 1}: "1000000000", } for inp, expectedAbs := range inputs2 { for i := -1; i <= 1; i += 2 { for j := -1; j <= 1; j += 2 { n := inp.n * int64(i) n2 := inp.n2 * int64(j) num := New(n, inp.exp) denom := New(n2, inp.exp2) expected := expectedAbs if i != j { expected = "-" + expectedAbs } got := num.Div(denom) if got.String() != expected { t.Errorf("expected %s when dividing %v by %v, got %v", expected, num, denom, got) } } } } } func TestDecimal_QuoRem(t *testing.T) { type Inp4 struct { d string d2 string exp int32 q string r string } cases := []Inp4{ {"10", "1", 0, "10", "0"}, {"1", "10", 0, "0", "1"}, {"1", "4", 2, "0.25", "0"}, {"1", "8", 2, "0.12", "0.04"}, {"10", "3", 1, "3.3", "0.1"}, {"100", "3", 1, "33.3", "0.1"}, {"1000", "10", -3, "0", "1000"}, {"1e-3", "2e-5", 0, "50", "0"}, {"1e-3", "2e-3", 1, "0.5", "0"}, {"4e-3", "0.8", 4, "5e-3", "0"}, {"4.1e-3", "0.8", 3, "5e-3", "1e-4"}, {"-4", "-3", 0, "1", "-1"}, {"-4", "3", 0, "-1", "-1"}, } for _, inp4 := range cases { d, _ := NewFromString(inp4.d) d2, _ := NewFromString(inp4.d2) prec := inp4.exp q, r := d.QuoRem(d2, prec) expectedQ, _ := NewFromString(inp4.q) expectedR, _ := NewFromString(inp4.r) if !q.Equal(expectedQ) || !r.Equal(expectedR) { t.Errorf("bad QuoRem division %s , %s , %d got %v, %v expected %s , %s", inp4.d, inp4.d2, prec, q, r, inp4.q, inp4.r) } if !d.Equal(d2.Mul(q).Add(r)) { t.Errorf("not fitting: d=%v, d2= %v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } if !q.Equal(q.Truncate(prec)) { t.Errorf("quotient wrong precision: d=%v, d2= %v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } if r.Abs().Cmp(d2.Abs().Mul(New(1, -prec))) >= 0 { t.Errorf("remainder too large: d=%v, d2= %v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } if r.value.Sign()*d.value.Sign() < 0 { t.Errorf("signum of divisor and rest do not match: d=%v, d2= %v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } } } type DivTestCase struct { d Decimal d2 Decimal prec int32 } func createDivTestCases() []DivTestCase { res := make([]DivTestCase, 0) var n int32 = 5 a := []int{1, 2, 3, 6, 7, 10, 100, 14, 5, 400, 0, 1000000, 1000000 + 1, 1000000 - 1} for s := -1; s < 2; s = s + 2 { // 2 for s2 := -1; s2 < 2; s2 = s2 + 2 { // 2 for e1 := -n; e1 <= n; e1++ { // 2n+1 for e2 := -n; e2 <= n; e2++ { // 2n+1 var prec int32 for prec = -n; prec <= n; prec++ { // 2n+1 for _, v1 := range a { // 11 for _, v2 := range a { // 11, even if 0 is skipped sign1 := New(int64(s), 0) sign2 := New(int64(s2), 0) d := sign1.Mul(New(int64(v1), e1)) d2 := sign2.Mul(New(int64(v2), e2)) res = append(res, DivTestCase{d, d2, prec}) } } } } } } } return res } func TestDecimal_QuoRem2(t *testing.T) { for _, tc := range createDivTestCases() { d := tc.d if sign(tc.d2) == 0 { continue } d2 := tc.d2 prec := tc.prec q, r := d.QuoRem(d2, prec) // rule 1: d = d2*q +r if !d.Equal(d2.Mul(q).Add(r)) { t.Errorf("not fitting, d=%v, d2=%v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } // rule 2: q is integral multiple of 10^(-prec) if !q.Equal(q.Truncate(prec)) { t.Errorf("quotient wrong precision, d=%v, d2=%v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } // rule 3: abs(r)= 0 { t.Errorf("remainder too large, d=%v, d2=%v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } // rule 4: r and d have the same sign if r.value.Sign()*d.value.Sign() < 0 { t.Errorf("signum of divisor and rest do not match, "+ "d=%v, d2=%v, prec=%d, q=%v, r=%v", d, d2, prec, q, r) } } } // this is the old Div method from decimal // Div returns d / d2. If it doesn't divide exactly, the result will have // DivisionPrecision digits after the decimal point. func (d Decimal) DivOld(d2 Decimal, prec int) Decimal { // NOTE(vadim): division is hard, use Rat to do it ratNum := d.Rat() ratDenom := d2.Rat() quoRat := big.NewRat(0, 1).Quo(ratNum, ratDenom) // HACK(vadim): converting from Rat to Decimal inefficiently for now ret, err := NewFromString(quoRat.FloatString(prec)) if err != nil { panic(err) // this should never happen } return ret } func sign(d Decimal) int { return d.value.Sign() } // rules for rounded divide, rounded to integer // rounded_divide(d,d2) = q // sign q * sign (d/d2) >= 0 // for d and d2 >0 : // q is already rounded // q = d/d2 + r , with r > -0.5 and r <= 0.5 // thus q-d/d2 = r, with r > -0.5 and r <= 0.5 // and d2 q -d = r d2 with r d2 > -d2/2 and r d2 <= d2/2 // and 2 (d2 q -d) = x with x > -d2 and x <= d2 // if we factor in precision then x > -d2 * 10^(-precision) and x <= d2 * 10(-precision) func TestDecimal_DivRound(t *testing.T) { cases := []struct { d string d2 string prec int32 result string }{ {"2", "2", 0, "1"}, {"1", "2", 0, "1"}, {"-1", "2", 0, "-1"}, {"-1", "-2", 0, "1"}, {"1", "-2", 0, "-1"}, {"1", "-20", 1, "-0.1"}, {"1", "-20", 2, "-0.05"}, {"1", "20.0000000000000000001", 1, "0"}, {"1", "19.9999999999999999999", 1, "0.1"}, } for _, s := range cases { d, _ := NewFromString(s.d) d2, _ := NewFromString(s.d2) result, _ := NewFromString(s.result) prec := s.prec q := d.DivRound(d2, prec) if sign(q)*sign(d)*sign(d2) < 0 { t.Errorf("sign of quotient wrong, got: %v/%v is about %v", d, d2, q) } x := q.Mul(d2).Abs().Sub(d.Abs()).Mul(New(2, 0)) if x.Cmp(d2.Abs().Mul(New(1, -prec))) > 0 { t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q) } if x.Cmp(d2.Abs().Mul(New(-1, -prec))) <= 0 { t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q) } if !q.Equal(result) { t.Errorf("rounded division wrong %s / %s scale %d = %s, got %v", s.d, s.d2, prec, s.result, q) } } } func TestDecimal_DivRound2(t *testing.T) { for _, tc := range createDivTestCases() { d := tc.d if sign(tc.d2) == 0 { continue } d2 := tc.d2 prec := tc.prec q := d.DivRound(d2, prec) if sign(q)*sign(d)*sign(d2) < 0 { t.Errorf("sign of quotient wrong, got: %v/%v is about %v", d, d2, q) } x := q.Mul(d2).Abs().Sub(d.Abs()).Mul(New(2, 0)) if x.Cmp(d2.Abs().Mul(New(1, -prec))) > 0 { t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q) } if x.Cmp(d2.Abs().Mul(New(-1, -prec))) <= 0 { t.Errorf("wrong rounding, got: %v/%v prec=%d is about %v", d, d2, prec, q) } } } func TestDecimal_RoundCash(t *testing.T) { tests := []struct { d string interval uint8 result string }{ {"3.44", 5, "3.45"}, {"3.43", 5, "3.45"}, {"3.42", 5, "3.40"}, {"3.425", 5, "3.45"}, {"3.47", 5, "3.45"}, {"3.478", 5, "3.50"}, {"3.48", 5, "3.50"}, {"348", 5, "348"}, {"3.23", 10, "3.20"}, {"3.33", 10, "3.30"}, {"3.53", 10, "3.50"}, {"3.949", 10, "3.90"}, {"3.95", 10, "4.00"}, {"395", 10, "395"}, {"3.23", 25, "3.25"}, {"3.33", 25, "3.25"}, {"3.53", 25, "3.50"}, {"3.93", 25, "4.00"}, {"3.41", 25, "3.50"}, {"3.249", 50, "3.00"}, {"3.33", 50, "3.50"}, {"3.749999999", 50, "3.50"}, {"3.75", 50, "4.00"}, {"3.93", 50, "4.00"}, {"393", 50, "393"}, {"3.249", 100, "3.00"}, {"3.49999", 100, "3.00"}, {"3.50", 100, "4.00"}, {"3.75", 100, "4.00"}, {"3.93", 100, "4.00"}, {"393", 100, "393"}, } for i, test := range tests { d, _ := NewFromString(test.d) haveRounded := d.RoundCash(test.interval) result, _ := NewFromString(test.result) if !haveRounded.Equal(result) { t.Errorf("Index %d: Cash rounding for %q interval %d want %q, have %q", i, test.d, test.interval, test.result, haveRounded) } } } func TestDecimal_RoundCash_Panic(t *testing.T) { defer func() { if r := recover(); r != nil { if have, ok := r.(string); ok { const want = "Decimal does not support this Cash rounding interval `231`. Supported: 5, 10, 25, 50, 100" if want != have { t.Errorf("\nWant: %q\nHave: %q", want, have) } } else { t.Errorf("Panic should contain an error string but got:\n%+v", r) } } else { t.Error("Expecting a panic but got nothing") } }() d, _ := NewFromString("1") d.RoundCash(231) } func TestDecimal_Mod(t *testing.T) { type Inp struct { a string b string } inputs := map[Inp]string{ Inp{"3", "2"}: "1", Inp{"3451204593", "2454495034"}: "996709559", Inp{"24544.95034", ".3451204593"}: "0.3283950433", Inp{".1", ".1"}: "0", Inp{"0", "1.001"}: "0", Inp{"-7.5", "2"}: "-1.5", Inp{"7.5", "-2"}: "1.5", Inp{"-7.5", "-2"}: "-1.5", } for inp, res := range inputs { a, err := NewFromString(inp.a) if err != nil { t.FailNow() } b, err := NewFromString(inp.b) if err != nil { t.FailNow() } c := a.Mod(b) if c.String() != res { t.Errorf("expected %s, got %s", res, c.String()) } } } func TestDecimal_Overflow(t *testing.T) { if !didPanic(func() { New(1, math.MinInt32).Mul(New(1, math.MinInt32)) }) { t.Fatalf("should have gotten an overflow panic") } if !didPanic(func() { New(1, math.MaxInt32).Mul(New(1, math.MaxInt32)) }) { t.Fatalf("should have gotten an overflow panic") } } func TestDecimal_ExtremeValues(t *testing.T) { // NOTE(vadim): this test takes pretty much forever if testing.Short() { t.Skip() } // NOTE(vadim): Seriously, the numbers involved are so large that this // test will take way too long, so mark it as success if it takes over // 1 second. The way this test typically fails (integer overflow) is that // a wrong result appears quickly, so if it takes a long time then it is // probably working properly. // Why even bother testing this? Completeness, I guess. -Vadim const timeLimit = 1 * time.Second test := func(f func()) { c := make(chan bool) go func() { f() close(c) }() select { case <-c: case <-time.After(timeLimit): } } test(func() { got := New(123, math.MinInt32).Floor() if !got.Equal(NewFromFloat(0)) { t.Errorf("Error: got %s, expected 0", got) } }) test(func() { got := New(123, math.MinInt32).Ceil() if !got.Equal(NewFromFloat(1)) { t.Errorf("Error: got %s, expected 1", got) } }) test(func() { got := New(123, math.MinInt32).Rat().FloatString(10) expected := "0.0000000000" if got != expected { t.Errorf("Error: got %s, expected %s", got, expected) } }) } func TestIntPart(t *testing.T) { for _, testCase := range []struct { Dec string IntPart int64 }{ {"0.01", 0}, {"12.1", 12}, {"9999.999", 9999}, {"-32768.01234", -32768}, } { d, err := NewFromString(testCase.Dec) if err != nil { t.Fatal(err) } if d.IntPart() != testCase.IntPart { t.Errorf("expect %d, got %d", testCase.IntPart, d.IntPart()) } } } func TestBigInt(t *testing.T) { testCases := []struct { Dec string BigIntRep string }{ {"0.0", "0"}, {"0.00000", "0"}, {"0.01", "0"}, {"12.1", "12"}, {"9999.999", "9999"}, {"-32768.01234", "-32768"}, {"-572372.0000000001", "-572372"}, } for _, testCase := range testCases { d, err := NewFromString(testCase.Dec) if err != nil { t.Fatal(err) } if d.BigInt().String() != testCase.BigIntRep { t.Errorf("expect %s, got %s", testCase.BigIntRep, d.BigInt()) } } } func TestBigFloat(t *testing.T) { testCases := []struct { Dec string BigFloatRep string }{ {"0.0", "0"}, {"0.00000", "0"}, {"0.01", "0.01"}, {"12.1", "12.1"}, {"9999.999", "9999.999"}, {"-32768.01234", "-32768.01234"}, {"-572372.0000000001", "-572372"}, {"512.012345123451234512345", "512.0123451"}, {"1.010101010101010101010101010101", "1.01010101"}, {"55555555.555555555555555555555", "55555555.56"}, } for _, testCase := range testCases { d, err := NewFromString(testCase.Dec) if err != nil { t.Fatal(err) } if d.BigFloat().String() != testCase.BigFloatRep { t.Errorf("expect %s, got %s", testCase.BigFloatRep, d.BigFloat()) } } } func TestDecimal_Min(t *testing.T) { // the first element in the array is the expected answer, rest are inputs testCases := [][]float64{ {0, 0}, {1, 1}, {-1, -1}, {1, 1, 2}, {-2, 1, 2, -2}, {-3, 0, 2, -2, -3}, } for _, test := range testCases { expected, input := test[0], test[1:] expectedDecimal := NewFromFloat(expected) decimalInput := []Decimal{} for _, inp := range input { d := NewFromFloat(inp) decimalInput = append(decimalInput, d) } got := Min(decimalInput[0], decimalInput[1:]...) if !got.Equal(expectedDecimal) { t.Errorf("Expected %v, got %v, input=%+v", expectedDecimal, got, decimalInput) } } } func TestDecimal_Max(t *testing.T) { // the first element in the array is the expected answer, rest are inputs testCases := [][]float64{ {0, 0}, {1, 1}, {-1, -1}, {2, 1, 2}, {2, 1, 2, -2}, {3, 0, 3, -2}, {-2, -3, -2}, } for _, test := range testCases { expected, input := test[0], test[1:] expectedDecimal := NewFromFloat(expected) decimalInput := []Decimal{} for _, inp := range input { d := NewFromFloat(inp) decimalInput = append(decimalInput, d) } got := Max(decimalInput[0], decimalInput[1:]...) if !got.Equal(expectedDecimal) { t.Errorf("Expected %v, got %v, input=%+v", expectedDecimal, got, decimalInput) } } } func TestDecimal_Scan(t *testing.T) { // test the Scan method that implements the // sql.Scanner interface // check for the for different type of values // that are possible to be received from the database // drivers // in normal operations the db driver (sqlite at least) // will return an int64 if you specified a numeric format a := Decimal{} dbvalue := 54.33 expected := NewFromFloat(dbvalue) err := a.Scan(dbvalue) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(54.33) failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Equal(expected) { t.Errorf("%s does not equal to %s", a, expected) } } // apparently MySQL 5.7.16 and returns these as float32 so we need // to handle these as well dbvalueFloat32 := float32(54.33) expected = NewFromFloat(float64(dbvalueFloat32)) err = a.Scan(dbvalueFloat32) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(54.33) failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Equal(expected) { t.Errorf("%s does not equal to %s", a, expected) } } // at least SQLite returns an int64 when 0 is stored in the db // and you specified a numeric format on the schema dbvalueInt := int64(0) expected = New(dbvalueInt, 0) err = a.Scan(dbvalueInt) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(0) failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Equal(expected) { t.Errorf("%s does not equal to %s", a, expected) } } // in case you specified a varchar in your SQL schema, // the database driver will return byte slice []byte valueStr := "535.666" dbvalueStr := []byte(valueStr) expected, err = NewFromString(valueStr) if err != nil { t.Fatal(err) } err = a.Scan(dbvalueStr) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan('535.666') failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Equal(expected) { t.Errorf("%s does not equal to %s", a, expected) } } // lib/pq can also return strings expected, err = NewFromString(valueStr) if err != nil { t.Fatal(err) } err = a.Scan(valueStr) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan('535.666') failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Equal(expected) { t.Errorf("%s does not equal to %s", a, expected) } } type foo struct{} err = a.Scan(foo{}) if err == nil { t.Errorf("a.Scan(Foo{}) should have thrown an error but did not") } } func TestDecimal_Value(t *testing.T) { // Make sure this does implement the database/sql's driver.Valuer interface var d Decimal if _, ok := interface{}(d).(driver.Valuer); !ok { t.Error("Decimal does not implement driver.Valuer") } // check that normal case is handled appropriately a := New(1234, -2) expected := "12.34" value, err := a.Value() if err != nil { t.Errorf("Decimal(12.34).Value() failed with message: %s", err) } else if value.(string) != expected { t.Errorf("%s does not equal to %s", a, expected) } } // old tests after this line func TestDecimal_Scale(t *testing.T) { a := New(1234, -3) if a.Exponent() != -3 { t.Errorf("error") } } func TestDecimal_Abs1(t *testing.T) { a := New(-1234, -4) b := New(1234, -4) c := a.Abs() if c.Cmp(b) != 0 { t.Errorf("error") } } func TestDecimal_Abs2(t *testing.T) { a := New(-1234, -4) b := New(1234, -4) c := b.Abs() if c.Cmp(a) == 0 { t.Errorf("error") } } func TestDecimal_Equalities(t *testing.T) { a := New(1234, 3) b := New(1234, 3) c := New(1234, 4) if !a.Equal(b) { t.Errorf("%q should equal %q", a, b) } if a.Equal(c) { t.Errorf("%q should not equal %q", a, c) } // note, this block should be deprecated, here for backwards compatibility if !a.Equals(b) { t.Errorf("%q should equal %q", a, b) } if !c.GreaterThan(b) { t.Errorf("%q should be greater than %q", c, b) } if b.GreaterThan(c) { t.Errorf("%q should not be greater than %q", b, c) } if !a.GreaterThanOrEqual(b) { t.Errorf("%q should be greater or equal %q", a, b) } if !c.GreaterThanOrEqual(b) { t.Errorf("%q should be greater or equal %q", c, b) } if b.GreaterThanOrEqual(c) { t.Errorf("%q should not be greater or equal %q", b, c) } if !b.LessThan(c) { t.Errorf("%q should be less than %q", a, b) } if c.LessThan(b) { t.Errorf("%q should not be less than %q", a, b) } if !a.LessThanOrEqual(b) { t.Errorf("%q should be less than or equal %q", a, b) } if !b.LessThanOrEqual(c) { t.Errorf("%q should be less than or equal %q", a, b) } if c.LessThanOrEqual(b) { t.Errorf("%q should not be less than or equal %q", a, b) } } func TestDecimal_ScalesNotEqual(t *testing.T) { a := New(1234, 2) b := New(1234, 3) if a.Equal(b) { t.Errorf("%q should not equal %q", a, b) } } func TestDecimal_Cmp1(t *testing.T) { a := New(123, 3) b := New(-1234, 2) if a.Cmp(b) != 1 { t.Errorf("Error") } } func TestDecimal_Cmp2(t *testing.T) { a := New(123, 3) b := New(1234, 2) if a.Cmp(b) != -1 { t.Errorf("Error") } } func TestPow(t *testing.T) { a := New(4, 0) b := New(2, 0) x := a.Pow(b) if x.String() != "16" { t.Errorf("Error, saw %s", x.String()) } } func TestNegativePow(t *testing.T) { a := New(4, 0) b := New(-2, 0) x := a.Pow(b) if x.String() != "0.0625" { t.Errorf("Error, saw %s", x.String()) } } func TestDecimal_IsInteger(t *testing.T) { for _, testCase := range []struct { Dec string IsInteger bool }{ {"0", true}, {"0.0000", true}, {"0.01", false}, {"0.01010101010000", false}, {"12.0", true}, {"12.00000000000000", true}, {"12.10000", false}, {"9999.0000", true}, {"99999999.000000000", true}, {"-656323444.0000000000000", true}, {"-32768.01234", false}, {"-32768.0123423562623600000", false}, } { d, err := NewFromString(testCase.Dec) if err != nil { t.Fatal(err) } if d.IsInteger() != testCase.IsInteger { t.Errorf("expect %t, got %t, for %s", testCase.IsInteger, d.IsInteger(), testCase.Dec) } } } func TestDecimal_Sign(t *testing.T) { if Zero.Sign() != 0 { t.Errorf("%q should have sign 0", Zero) } one := New(1, 0) if one.Sign() != 1 { t.Errorf("%q should have sign 1", one) } mone := New(-1, 0) if mone.Sign() != -1 { t.Errorf("%q should have sign -1", mone) } } func didPanic(f func()) bool { ret := false func() { defer func() { if message := recover(); message != nil { ret = true } }() // call the target function f() }() return ret } func TestDecimal_Coefficient(t *testing.T) { d := New(123, 0) co := d.Coefficient() if co.Int64() != 123 { t.Error("Coefficient should be 123; Got:", co) } co.Set(big.NewInt(0)) if d.IntPart() != 123 { t.Error("Modifying coefficient modified Decimal; Got:", d) } } func TestNullDecimal_Scan(t *testing.T) { // test the Scan method that implements the // sql.Scanner interface // check for the for different type of values // that are possible to be received from the database // drivers // in normal operations the db driver (sqlite at least) // will return an int64 if you specified a numeric format // Make sure handles nil values a := NullDecimal{} var dbvaluePtr interface{} err := a.Scan(dbvaluePtr) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(nil) failed with message: %s", err) } else { if a.Valid { t.Errorf("%s is not null", a.Decimal) } } dbvalue := 54.33 expected := NewFromFloat(dbvalue) err = a.Scan(dbvalue) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(54.33) failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Valid { t.Errorf("%s is null", a.Decimal) } else if !a.Decimal.Equals(expected) { t.Errorf("%s does not equal to %s", a.Decimal, expected) } } // at least SQLite returns an int64 when 0 is stored in the db // and you specified a numeric format on the schema dbvalueInt := int64(0) expected = New(dbvalueInt, 0) err = a.Scan(dbvalueInt) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan(0) failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Valid { t.Errorf("%s is null", a.Decimal) } else if !a.Decimal.Equals(expected) { t.Errorf("%v does not equal %v", a, expected) } } // in case you specified a varchar in your SQL schema, // the database driver will return byte slice []byte valueStr := "535.666" dbvalueStr := []byte(valueStr) expected, err = NewFromString(valueStr) if err != nil { t.Fatal(err) } err = a.Scan(dbvalueStr) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan('535.666') failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Valid { t.Errorf("%s is null", a.Decimal) } else if !a.Decimal.Equals(expected) { t.Errorf("%v does not equal %v", a, expected) } } // lib/pq can also return strings expected, err = NewFromString(valueStr) if err != nil { t.Fatal(err) } err = a.Scan(valueStr) if err != nil { // Scan failed... no need to test result value t.Errorf("a.Scan('535.666') failed with message: %s", err) } else { // Scan succeeded... test resulting values if !a.Valid { t.Errorf("%s is null", a.Decimal) } else if !a.Decimal.Equals(expected) { t.Errorf("%v does not equal %v", a, expected) } } } func TestNullDecimal_Value(t *testing.T) { // Make sure this does implement the database/sql's driver.Valuer interface var nullDecimal NullDecimal if _, ok := interface{}(nullDecimal).(driver.Valuer); !ok { t.Error("NullDecimal does not implement driver.Valuer") } // check that null is handled appropriately value, err := nullDecimal.Value() if err != nil { t.Errorf("NullDecimal{}.Valid() failed with message: %s", err) } else if value != nil { t.Errorf("%v is not nil", value) } // check that normal case is handled appropriately a := NullDecimal{Decimal: New(1234, -2), Valid: true} expected := "12.34" value, err = a.Value() if err != nil { t.Errorf("NullDecimal(12.34).Value() failed with message: %s", err) } else if value.(string) != expected { t.Errorf("%v does not equal %v", a, expected) } } func TestBinary(t *testing.T) { for _, y := range testTable { x := y.float // Create the decimal d1 := NewFromFloat(x) // Encode to binary b, err := d1.MarshalBinary() if err != nil { t.Errorf("error marshalling %v to binary: %v", d1, err) } // Restore from binary var d2 Decimal err = (&d2).UnmarshalBinary(b) if err != nil { t.Errorf("error unmarshalling from binary: %v", err) } // The restored decimal should equal the original if !d1.Equals(d2) { t.Errorf("expected %v when restoring, got %v", d1, d2) } } } func slicesEqual(a, b []byte) bool { for i, val := range a { if b[i] != val { return false } } return true } func TestGobEncode(t *testing.T) { for _, y := range testTable { x := y.float d1 := NewFromFloat(x) b1, err := d1.GobEncode() if err != nil { t.Errorf("error encoding %v to binary: %v", d1, err) } d2 := NewFromFloat(x) b2, err := d2.GobEncode() if err != nil { t.Errorf("error encoding %v to binary: %v", d2, err) } if !slicesEqual(b1, b2) { t.Errorf("something about the gobencode is not working properly \n%v\n%v", b1, b2) } var d3 Decimal err = d3.GobDecode(b1) if err != nil { t.Errorf("Error gobdecoding %v, got %v", b1, d3) } var d4 Decimal err = d4.GobDecode(b2) if err != nil { t.Errorf("Error gobdecoding %v, got %v", b2, d4) } eq := d3.Equal(d4) if eq != true { t.Errorf("Encoding then decoding mutated Decimal") } eq = d1.Equal(d3) if eq != true { t.Errorf("Error gobencoding/decoding %v, got %v", d1, d3) } } } func TestSum(t *testing.T) { vals := make([]Decimal, 10) var i = int64(0) for key := range vals { vals[key] = New(i, 0) i++ } sum := Sum(vals[0], vals[1:]...) if !sum.Equal(New(45, 0)) { t.Errorf("Failed to calculate sum, expected %s got %s", New(45, 0), sum) } } func TestAvg(t *testing.T) { vals := make([]Decimal, 10) var i = int64(0) for key := range vals { vals[key] = New(i, 0) i++ } avg := Avg(vals[0], vals[1:]...) if !avg.Equal(NewFromFloat(4.5)) { t.Errorf("Failed to calculate average, expected %s got %s", NewFromFloat(4.5).String(), avg.String()) } } func TestRoundBankAnomaly(t *testing.T) { a := New(25, -1) b := New(250, -2) if !a.Equal(b) { t.Errorf("Expected %s to equal %s", a, b) } expected := New(2, 0) aRounded := a.RoundBank(0) if !aRounded.Equal(expected) { t.Errorf("Expected bank rounding %s to equal %s, but it was %s", a, expected, aRounded) } bRounded := b.RoundBank(0) if !bRounded.Equal(expected) { t.Errorf("Expected bank rounding %s to equal %s, but it was %s", b, expected, bRounded) } } // Trig tests // For Atan func TestAtan(t *testing.T) { inps := []string{ "-2.91919191919191919", "-1.0", "-0.25", "0.0", "0.33", "1.0", "5.0", "10", "11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424", } sols := []string{ "-1.24076438822058001027437062753106", "-0.78539816339744833061616997868383", "-0.24497866312686415", "0.0", "0.318747560420644443", "0.78539816339744833061616997868383", "1.37340076694501580123233995736766", "1.47112767430373453123233995736766", "1.57079623588597296123259450235374", } for i, inp := range inps { d, err := NewFromString(inp) if err != nil { t.FailNow() } s, err := NewFromString(sols[i]) if err != nil { t.FailNow() } a := d.Atan() if !a.Equal(s) { t.Errorf("expected %s, got %s", s, a) } } } // For Sin func TestSin(t *testing.T) { inps := []string{ "-2.91919191919191919", "-1.0", "-0.25", "0.0", "0.33", "1.0", "5.0", "10", "11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424", } sols := []string{"-0.22057186252002995641471297726318877448242875710373383657841216606788849153474483300147427943530288911869356126149550184271061369789963810497434594683859566879253561990821788142048867910104964466745284318577343435957806286762494529983369776697504436326725441516925396488258485248699247367113416543705253919473126183478178486954138205996912770183192357029798618739277146694040778731661407420114923656224752540889120768", "-0.841470984807896544828551915928318375739843472469519282898610111931110319333748010828751784005573402229699531838022117989945539661588502120624574802425114599802714611508860519655182175315926637327774878594985045816542706701485174683683726979309922117859910272413672784175028365607893544855897795184024100973080880074046886009375162838756876336134083638363801171409953672944184918309063800980214873465660723218405962257950683415203634506166523593278", "-0.2474039592545229296662577977006816864013671875", "0", "0.3240430283948683457891331120415701894104386268737728", "0.841470984807896544828551915928318375739843472469519282898610111931110319333748010828751784005573402229699531838022117989945539661588502120624574802425114599802714611508860519655182175315926637327774878594985045816542706701485174683683726979309922117859910272413672784175028365607893544855897795184024100973080880074046886009375162838756876336134083638363801171409953672944184918309063800980214873465660723218405962257950683415203634506166523593278", "-0.958924274663138409032065951037351417114444405831206421994322505831797734568720303321152847999323782235893449831846516332891972309733806145798957570823292783131379570446989311599459252931842975162373777189193072018951049969744350662993214861042908755303566670204873618202680865638534865944483058650517380292320436016362659617294570185140789829574277032406195741535138712427510938542219940873171248862329526140744770994303733112530324791184417282382", "-0.54402111088937016772477554483765124109312606762621462357463994520238396180161585438877562935656067241573063207614488370477645194661241525080677431257416988398683714890165970942834453391033857378247849486306346743023618509617104937236345831462093934032592562972419977883837745736210439651143668255744843041350221801750331646628192115694352540293150183983357476391787825596543270240461102629075832777618592034309799936", "-0.564291758480422881634770440632390475980828840253516895637281099241819037882007239070203007530085741820184955492382572029153491807930868879341091067301689987699567034024159005627332722089169680203292567574310010066799858914647295684974242359142300929248173166551428537696685165964880390889406578530338963341989826231514301546476672476399906348023294571001061677668735117509440368611093448917120819545826797975989350435900286332895885871219875665471968941335407351099209738417818747252638912592184093301853338763294381446907254104878969784040526201729163408095795934201105630182851806342356035203279670146684553491616847294749721014579109870396804713831114709372638323643327823671187472335866664108658093206409882794958673673978956925250261545083579947618620746006004554405785185537391110314728988164693223775249484198058394348289545771967707968288542718255197272633789792059019367104377340604030147471453833808674013259696102003732963091159662478879760121731138091114134586544668859915547568540172541576138084166990547345181184322550297604278946942918844039406876827936831612756344331500301118652183156052728447906384772901595431751550607818380262138322673253023464533931883787069611052589166000316238423939491520880451263927981787175602294299295744", } for i, inp := range inps { d, err := NewFromString(inp) if err != nil { t.FailNow() } s, err := NewFromString(sols[i]) if err != nil { t.FailNow() } a := d.Sin() if !a.Equal(s) { t.Errorf("expected %s, got %s", s, a) } } } // For Cos func TestCos(t *testing.T) { inps := []string{ "-2.91919191919191919", "-1.0", "-0.25", "0.0", "0.33", "1.0", "5.0", "10", "11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424", } sols := []string{ "-0.975370726167463467746508538219884948528729295145689640359666742268127382748782064668565276308334226452812521220478854320025773591423493734486361306323829818426063430805234608660356853863442937297855742231573288105774823103008774355455799906250461848079705023428527473474556899228935370709945979509634251305018978306493011197513482210179171510947538040406781879762352211326273272515279567525396877609653501706919545667682725671944948392322552266752", "0.54030230586813965874561515067176071767603141150991567490927772778673118786033739102174242337864109186439207498973007363884202112942385976796862442063752663646870430360736682397798633852405003167527051283327366631405990604840629657123985368031838052877290142895506386796217551784101265975360960112885444847880134909594560331781699767647860744559228420471946006511861233129745921297270844542687374552066388998112901504", "0.968912421710644784099084544806854121387004852294921875", "1", "0.9460423435283869715490383692051286742343482760977712222", "0.54030230586813965874561515067176071767603141150991567490927772778673118786033739102174242337864109186439207498973007363884202112942385976796862442063752663646870430360736682397798633852405003167527051283327366631405990604840629657123985368031838052877290142895506386796217551784101265975360960112885444847880134909594560331781699767647860744559228420471946006511861233129745921297270844542687374552066388998112901504", "0.28366218546322646623291670213892426815646045792775066552057877370468842342090306560693620285882975471913545189522117672866861003904575909174769890684057564495184019705963607555427518763375472432216131070235796577209064861003009894615394882021220247535890708789312783718414424224334988974848162884228012265684775651099758365989567444515619764427493598258393280941942356912304265535918025036942025858493361644535438208", "-0.839071529076452222947082170022504835457755803801719612447629165523199043803440231769716865070163209041973184176293170330332317060558438085478980463542480791358920580076809381102480339018809694514100495572097422057215638383077242523713704127605770444906854175870243452753002238589530499630034663296166308443155999957196346563161387705205277189957388653461251461388391745795979375660087266037741360406956289962327970672363315696841378765492754546688", "-0.82557544253149396284458404188071504476091346830440347376462206521981928020803354950315062147200396866217255527509254080721982393941347365824137698491042935894213870423296625749297033966815252917361266452901192457318047750698424190124169875103436588397415032138037063155981648677895645409699825582226442363080800781881653440538927704569142007751338851079530521979429507520541625303794665680584709171813053216867014700596866196844144286737568957809383224972108999354839705480223052622003994027222120126949093911643497423100187973906980635670000034664323357488815820848035808846624518774608931622703631130673844138378087837990739103263093532314835289302930152150130664948083902949999427848344301686172490282395687167681679607401220592559832932068966455384902377056623736013617949634746332323529256184776892339963173795176200590119077305668901887229709592836744082027738666294887303249770621722032438202753270710379312736193201366287952361100525126056993039858894987153270630277483613793395809214871734783742285495171911648254647287555645360520115341268930844095156502348405343740866836850201634640011708462641462047870611041595707018966032206807675586825362640000739202116391403514629284000986232673698892843586989003952425039512325844566790376383098534975022847888104706525937115931692008959513984157709954859352131323440787667052399474107219968", } for i, inp := range inps { d, err := NewFromString(inp) if err != nil { t.FailNow() } s, err := NewFromString(sols[i]) if err != nil { t.FailNow() } a := d.Cos() if !a.Equal(s) { t.Errorf("expected %s, got %s", s, a) } } } // For Tan func TestTan(t *testing.T) { inps := []string{ "-2.91919191919191919", "-1.0", "-0.25", "0.0", "0.33", "1.0", "5.0", "10", "11000020.2407442310156021090304691671842603586882014729198302312846062338790031898128063403419218957424", } sols := []string{ "0.2261415650505790298980791606748881031998682652", "-1.5574077246549025", "-0.255341921221036275", "0.0", "0.342524867530038963", "1.5574077246549025", "-3.3805150062465829", "0.6483608274590872485524085572681343280321117494", "0.68351325561491170753499935023939368502774607234006019034769919811202010905597996164029250820702097041244539696", } for i, inp := range inps { d, err := NewFromString(inp) if err != nil { t.FailNow() } s, err := NewFromString(sols[i]) if err != nil { t.FailNow() } a := d.Tan() if !a.Equal(s) { t.Errorf("expected %s, got %s", s, a) } } } func ExampleNewFromFloat32() { fmt.Println(NewFromFloat32(123.123123123123).String()) fmt.Println(NewFromFloat32(.123123123123123).String()) fmt.Println(NewFromFloat32(-1e13).String()) // OUTPUT: //123.12312 //0.123123124 //-10000000000000 } func ExampleNewFromFloat() { fmt.Println(NewFromFloat(123.123123123123).String()) fmt.Println(NewFromFloat(.123123123123123).String()) fmt.Println(NewFromFloat(-1e13).String()) // OUTPUT: //123.123123123123 //0.123123123123123 //-10000000000000 }