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package rand
import (
"bytes"
"io"
"testing"
)
func TestGitterDelay(t *testing.T) {
maxFloat1 := 1 - 1/float64(1<<53)
cases := map[string]struct {
Reader io.Reader
Expect float64
}{
"floor": {
Reader: bytes.NewReader([]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
Expect: 0,
},
"ceiling": {
Reader: bytes.NewReader([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}),
Expect: maxFloat1,
},
}
for name, c := range cases {
t.Run(name, func(t *testing.T) {
d, err := Float64(c.Reader)
if err != nil {
t.Fatalf("expect no error, %v", err)
}
if e, a := c.Expect, d; e != a {
t.Errorf("expect %v delay, got %v", e, a)
}
})
}
}
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