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larger test for QuoRem

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This commit is contained in:
Roland Averkamp 2015-09-01 23:20:23 +02:00
parent e4641fd8ba
commit 49e27aea3d
1 changed files with 51 additions and 10 deletions
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61
decimal_test.go
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@ -630,7 +630,7 @@ func TestDecimal_Div(t *testing.T) {
Inp{"-4612301402398.4753343454", "23.5"}: "-196268144782.9138440146978723",
}
for inp, expected := range inputs {
for inp, expectedStr := range inputs {
num, err := NewFromString(inp.a)
if err != nil {
t.FailNow()
@ -640,13 +640,14 @@ func TestDecimal_Div(t *testing.T) {
t.FailNow()
}
got := num.Div(denom)
if got.String() != expected {
t.Errorf("expected %s when dividing %v by %v, got %v",
expected, _ := NewFromString(expectedStr)
if !got.Equals(expected) {
t.Errorf("expected %v when dividing %v by %v, got %v",
expected, num, denom, got)
}
got2 := num.DivRound(denom, int32(DivisionPrecision))
if !got.Equals(got2) {
t.Errorf("aua: %s %s", got.String(), got2.String())
if !got2.Equals(expected) {
t.Errorf("expected %v on DivRound (%v,%v), got %v", expected, num, denom, got2)
}
}
@ -719,17 +720,17 @@ func TestDecimal_QuoRem(t *testing.T) {
expectedQ, _ := NewFromString(inp4.q)
expectedR, _ := NewFromString(inp4.r)
if !q.Equals(expectedQ) || !r.Equals(expectedR) {
t.Errorf("bad division %s %s %d -> %s %s",
inp4.d, inp4.d2, exp, q.String(), r.String())
t.Errorf("bad QuoRem division %s , %s , %d got %v, %v expected %s , %s",
inp4.d, inp4.d2, exp, q, r, inp4.q, inp4.r)
}
if !d.Equals(d2.Mul(q).Add(r)) {
t.Errorf("not fitting")
}
if !q.Equals(q.Truncate(exp)) {
t.Errorf("Quotient wrong")
t.Errorf("quotient wrong precision")
}
if r.Abs().Cmp(d2.Abs().Mul(New(1, -exp))) >= 0 {
t.Errorf("rem too large")
t.Errorf("remainder too large")
}
if r.value.Sign()*d.value.Sign() < 0 {
t.Errorf("signum of divisor and rest do not match")
@ -737,6 +738,47 @@ func TestDecimal_QuoRem(t *testing.T) {
}
}
func TestDecimal_QuoRem2(t *testing.T) {
var n int32 = 5
a := []int{1, 2, 3, 6, 7, 10, 100, 14, 5, 400, 0}
for s := -1; s < 2; s = s + 2 {
for s2 := -1; s2 < 2; s2 = s2 + 2 {
for e1 := -n; e1 < n; e1++ {
for e2 := -n; e2 < n; e2++ {
var prec int32
for prec = -n; prec < n; prec++ {
for _, v1 := range a {
for _, v2 := range a {
if v2 == 0 {
continue
}
sign1 := New(int64(s), 0)
sign2 := New(int64(s2), 0)
d := sign1.Mul(New(int64(v1), int32(e1)))
d2 := sign2.Mul(New(int64(v2), int32(e2)))
q, r := d.QuoRem(d2, prec)
if !d.Equals(d2.Mul(q).Add(r)) {
t.Errorf("not fitting")
}
if !q.Equals(q.Truncate(prec)) {
t.Errorf("quotient wrong precision")
}
if r.Abs().Cmp(d2.Abs().Mul(New(1, -prec))) >= 0 {
t.Errorf("remainder too large")
}
if r.value.Sign()*d.value.Sign() < 0 {
t.Errorf("signum of divisor and rest do not match")
}
}
}
}
}
}
}
}
}
func TestDecimal_DivRound(t *testing.T) {
cases := []struct {
d string
@ -749,7 +791,6 @@ func TestDecimal_DivRound(t *testing.T) {
{"-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"},