v0.2.2: Minor fixes and testing

- Replaced log.Fatal() with log.Fatalf() since we provide %v
- Added proper testing and benchmarking

apg.go

@@ -12,7 +12,7 @@ import (
 
 // Constants
 const DefaultPwLenght int = 20
-const VersionString string = "0.2.1"
+const VersionString string = "0.2.2"
 const PwLowerCharsHuman string = "abcdefghjkmnpqrstuvwxyz"
 const PwUpperCharsHuman string = "ABCDEFGHJKMNPQRSTUVWXYZ"
 const PwLowerChars string = "abcdefghijklmnopqrstuvwxyz"
@@ -131,7 +131,7 @@ func getRandNum(maxNum int) int {
 	maxNumBigInt := big.NewInt(int64(maxNum))
 	randNum64, err := rand.Int(rand.Reader, maxNumBigInt)
 	if err != nil {
-		log.Fatal("An error occured generating random number: %v", err)
+		log.Fatalf("An error occured generating random number: %v", err)
 	}
 	randNum := int(randNum64.Int64())
 	return randNum

apg_test.go

@@ -2,6 +2,59 @@ package main
 
 import "testing"
 
-func TestSkipForNow(t *testing.T) {
-	t.Logf("All good.")
+// Make sure the flags are initalized
+var _ = func() bool {
+	testing.Init()
+	return true
+}()
+
+// Test getRandNum with max 1000
+func TestGetRandNumMax1000(t *testing.T) {
+	randNum := getRandNum(1000)
+	if randNum > 1000 {
+		t.Errorf("Generated random number between 0 and 1000 is too big: %d", randNum)
+	}
+	if randNum < 0 {
+		t.Errorf("Generated random number between 0 and 1000 is too small: %d", randNum)
+	}
+}
+
+// Test getRandNum with max 1
+func TestGetRandNumMax1(t *testing.T) {
+	randNum := getRandNum(1)
+	if randNum > 1 {
+		t.Errorf("Generated random number between 0 and 1 is too big: %d", randNum)
+	}
+	if randNum < 0 {
+		t.Errorf("Generated random number between 0 and 1 is too small: %d", randNum)
+	}
+}
+
+// Test getRandChar
+func TestGetRandChar(t *testing.T) {
+	charRange := "ABC"
+	randChar := getRandChar(&charRange, 1)
+	if randChar != "A" && randChar != "B" && randChar != "C" {
+		t.Errorf("Random character generation failed. Expected A, B or C but got: %v", randChar)
+	}
+
+	randChar = getRandChar(&charRange, 1000)
+	if len(randChar) != 1000 {
+		t.Errorf("Generated random characters with 1000 chars returned wrong amount of chars: %v", len(randChar))
+	}
+}
+
+// Benchmark: Random number generation
+func BenchmarkGetRandNum(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		getRandNum(100000)
+	}
+}
+
+// Benchmark: Random char generation
+func BenchmarkGetRandChar(b *testing.B) {
+	charRange := "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890\"#/!\\$%&+-*.,?=()[]{}:;~^|"
+	for i := 0; i < b.N; i++ {
+		getRandChar(&charRange, 20)
+	}
 }