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| // Copyright 2017 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 color
|
| import (
| "testing"
| "testing/quick"
| )
|
| func TestSqDiff(t *testing.T) {
| // canonical sqDiff implementation
| orig := func(x, y uint32) uint32 {
| var d uint32
| if x > y {
| d = uint32(x - y)
| } else {
| d = uint32(y - x)
| }
| return (d * d) >> 2
| }
| testCases := []uint32{
| 0,
| 1,
| 2,
| 0x0fffd,
| 0x0fffe,
| 0x0ffff,
| 0x10000,
| 0x10001,
| 0x10002,
| 0xfffffffd,
| 0xfffffffe,
| 0xffffffff,
| }
| for _, x := range testCases {
| for _, y := range testCases {
| if got, want := sqDiff(x, y), orig(x, y); got != want {
| t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want)
| }
| }
| }
| if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil {
| t.Fatal(err)
| }
| }
|
|
