blob: ea66b7bef23387ac5896a771b760dba578acbdee [file] [log] [blame]
// 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)
}
}