48 lines
890 B
Go
48 lines
890 B
Go
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package color
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import (
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"testing"
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"testing/quick"
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)
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func TestSqDiff(t *testing.T) {
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// canonical sqDiff implementation
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orig := func(x, y uint32) uint32 {
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var d uint32
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if x > y {
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d = uint32(x - y)
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} else {
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d = uint32(y - x)
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}
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return (d * d) >> 2
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}
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testCases := []uint32{
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0,
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1,
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2,
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0x0fffd,
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0x0fffe,
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0x0ffff,
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0x10000,
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0x10001,
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0x10002,
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0xfffffffd,
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0xfffffffe,
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0xffffffff,
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}
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for _, x := range testCases {
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for _, y := range testCases {
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if got, want := sqDiff(x, y), orig(x, y); got != want {
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t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want)
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}
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}
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}
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if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil {
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t.Fatal(err)
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}
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}
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