55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
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// Copyright 2012 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 flate
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import (
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"testing"
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)
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func TestForwardCopy(t *testing.T) {
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testCases := []struct {
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dst0, dst1 int
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src0, src1 int
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want string
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}{
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{0, 9, 0, 9, "012345678"},
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{0, 5, 4, 9, "45678"},
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{4, 9, 0, 5, "01230"},
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{1, 6, 3, 8, "34567"},
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{3, 8, 1, 6, "12121"},
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{0, 9, 3, 6, "345"},
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{3, 6, 0, 9, "012"},
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{1, 6, 0, 9, "00000"},
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{0, 4, 7, 8, "7"},
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{0, 1, 6, 8, "6"},
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{4, 4, 6, 9, ""},
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{2, 8, 6, 6, ""},
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{0, 0, 0, 0, ""},
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}
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for _, tc := range testCases {
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b := []byte("0123456789")
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n := tc.dst1 - tc.dst0
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if tc.src1-tc.src0 < n {
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n = tc.src1 - tc.src0
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}
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forwardCopy(b, tc.dst0, tc.src0, n)
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got := string(b[tc.dst0 : tc.dst0+n])
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if got != tc.want {
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t.Errorf("dst=b[%d:%d], src=b[%d:%d]: got %q, want %q",
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tc.dst0, tc.dst1, tc.src0, tc.src1, got, tc.want)
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}
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// Check that the bytes outside of dst[:n] were not modified.
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for i, x := range b {
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if i >= tc.dst0 && i < tc.dst0+n {
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continue
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}
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if int(x) != '0'+i {
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t.Errorf("dst=b[%d:%d], src=b[%d:%d]: copy overrun at b[%d]: got '%c', want '%c'",
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tc.dst0, tc.dst1, tc.src0, tc.src1, i, x, '0'+i)
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}
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}
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}
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}
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