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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 diff
import (
"bytes"
"path/filepath"
"testing"
"golang.org/x/tools/txtar"
)
func clean(text []byte) []byte {
text = bytes.ReplaceAll(text, []byte("$\n"), []byte("\n"))
text = bytes.TrimSuffix(text, []byte("^D\n"))
return text
}
func Test(t *testing.T) {
files, _ := filepath.Glob("testdata/*.txt")
if len(files) == 0 {
t.Fatalf("no testdata")
}
for _, file := range files {
t.Run(filepath.Base(file), func(t *testing.T) {
a, err := txtar.ParseFile(file)
if err != nil {
t.Fatal(err)
}
if len(a.Files) != 3 || a.Files[2].Name != "diff" {
t.Fatalf("%s: want three files, third named \"diff\"", file)
}
diffs := Diff(a.Files[0].Name, clean(a.Files[0].Data), a.Files[1].Name, clean(a.Files[1].Data))
want := clean(a.Files[2].Data)
if !bytes.Equal(diffs, want) {
t.Fatalf("%s: have:\n%s\nwant:\n%s\n%s", file,
diffs, want, Diff("have", diffs, "want", want))
}
})
}
}
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