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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package test
import (
"math/bits"
"testing"
)
func TestBitLen64(t *testing.T) {
for i := 0; i <= 64; i++ {
got := bits.Len64(1 << i)
want := i + 1
if want == 65 {
want = 0
}
if got != want {
t.Errorf("Len64(1<<%d) = %d, want %d", i, got, want)
}
}
}
func TestBitLen32(t *testing.T) {
for i := 0; i <= 32; i++ {
got := bits.Len32(1 << i)
want := i + 1
if want == 33 {
want = 0
}
if got != want {
t.Errorf("Len32(1<<%d) = %d, want %d", i, got, want)
}
}
}
func TestBitLen16(t *testing.T) {
for i := 0; i <= 16; i++ {
got := bits.Len16(1 << i)
want := i + 1
if want == 17 {
want = 0
}
if got != want {
t.Errorf("Len16(1<<%d) = %d, want %d", i, got, want)
}
}
}
func TestBitLen8(t *testing.T) {
for i := 0; i <= 8; i++ {
got := bits.Len8(1 << i)
want := i + 1
if want == 9 {
want = 0
}
if got != want {
t.Errorf("Len8(1<<%d) = %d, want %d", i, got, want)
}
}
}
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