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package randutil
import (
"regexp"
"testing"
)
func TestMathRandomGenerator(t *testing.T) {
g := NewMathRandomGenerator()
isLetter := regexp.MustCompile(`^[a-zA-Z]+$`).MatchString
for i := 0; i < 10000; i++ {
s := g.GenerateString(10, runesAlpha)
if len(s) != 10 {
t.Error("Generator returned invalid length")
}
if !isLetter(s) {
t.Errorf("Generator returned unexpected character: %s", s)
}
}
}
func TestIntn(t *testing.T) {
g := NewMathRandomGenerator()
min := 100
max := 0
for i := 0; i < 10000; i++ {
r := g.Intn(100)
if r < 0 || r >= 100 {
t.Fatalf("Out of range of Intn(100): %d", r)
}
if r < min {
min = r
}
if r > max {
max = r
}
}
if min > 10 {
t.Error("Value around lower boundary was not generated")
}
if max < 90 {
t.Error("Value around upper boundary was not generated")
}
}
func TestUint64(t *testing.T) {
g := NewMathRandomGenerator()
min := uint64(0xFFFFFFFFFFFFFFFF)
max := uint64(0)
for i := 0; i < 10000; i++ {
r := g.Uint64()
if r < min {
min = r
}
if r > max {
max = r
}
}
if min > 0x1000000000000000 {
t.Error("Value around lower boundary was not generated")
}
if max < 0xF000000000000000 {
t.Error("Value around upper boundary was not generated")
}
}
func TestUint32(t *testing.T) {
g := NewMathRandomGenerator()
min := uint32(0xFFFFFFFF)
max := uint32(0)
for i := 0; i < 10000; i++ {
r := g.Uint32()
if r < min {
min = r
}
if r > max {
max = r
}
}
if min > 0x10000000 {
t.Error("Value around lower boundary was not generated")
}
if max < 0xF0000000 {
t.Error("Value around upper boundary was not generated")
}
}
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