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@@ -0,0 +1,127 @@
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+// Copyright 2022 Google Inc. All rights reserved.
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+//
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+// Licensed under the Apache License, Version 2.0 (the "License");
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+// you may not use this file except in compliance with the License.
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+// You may obtain a copy of the License at
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+//
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+// http://www.apache.org/licenses/LICENSE-2.0
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+//
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+// Unless required by applicable law or agreed to in writing, software
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+// distributed under the License is distributed on an "AS IS" BASIS,
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+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+// See the License for the specific language governing permissions and
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+// limitations under the License.
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+
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+package main
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+
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+import (
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+ "io/ioutil"
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+ "os"
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+ "path/filepath"
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+ "strings"
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+ "testing"
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+)
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+
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+func Test_filesHaveSameContents(t *testing.T) {
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+
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+ tests := []struct {
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+ name string
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+ a string
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+ b string
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+ missingA bool
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+ missingB bool
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+
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+ equal bool
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+ }{
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+ {
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+ name: "empty",
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+ a: "",
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+ b: "",
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+ equal: true,
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+ },
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+ {
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+ name: "equal",
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+ a: "foo",
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+ b: "foo",
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+ equal: true,
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+ },
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+ {
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+ name: "unequal",
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+ a: "foo",
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+ b: "bar",
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+ equal: false,
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+ },
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+ {
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+ name: "unequal different sizes",
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+ a: "foo",
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+ b: "foobar",
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+ equal: false,
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+ },
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+ {
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+ name: "equal large",
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+ a: strings.Repeat("a", 2*1024*1024),
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+ b: strings.Repeat("a", 2*1024*1024),
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+ equal: true,
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+ },
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+ {
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+ name: "equal large unaligned",
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+ a: strings.Repeat("a", 2*1024*1024+10),
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+ b: strings.Repeat("a", 2*1024*1024+10),
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+ equal: true,
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+ },
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+ {
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+ name: "unequal large",
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+ a: strings.Repeat("a", 2*1024*1024),
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+ b: strings.Repeat("a", 2*1024*1024-1) + "b",
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+ equal: false,
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+ },
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+ {
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+ name: "unequal large unaligned",
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+ a: strings.Repeat("a", 2*1024*1024+10),
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+ b: strings.Repeat("a", 2*1024*1024+9) + "b",
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+ equal: false,
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+ },
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+ {
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+ name: "missing a",
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+ missingA: true,
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+ b: "foo",
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+ equal: false,
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+ },
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+ {
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+ name: "missing b",
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+ a: "foo",
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+ missingB: true,
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+ equal: false,
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+ },
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+ }
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+ for _, tt := range tests {
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+ t.Run(tt.name, func(t *testing.T) {
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+ tempDir, err := os.MkdirTemp("", "testFilesHaveSameContents")
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+ if err != nil {
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+ t.Fatalf("failed to create temp dir: %s", err)
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+ }
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+ defer os.RemoveAll(tempDir)
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+
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+ fileA := filepath.Join(tempDir, "a")
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+ fileB := filepath.Join(tempDir, "b")
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+
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+ if !tt.missingA {
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+ err := ioutil.WriteFile(fileA, []byte(tt.a), 0666)
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+ if err != nil {
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+ t.Fatalf("failed to write %s: %s", fileA, err)
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+ }
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+ }
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+
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+ if !tt.missingB {
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+ err := ioutil.WriteFile(fileB, []byte(tt.b), 0666)
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+ if err != nil {
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+ t.Fatalf("failed to write %s: %s", fileB, err)
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+ }
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+ }
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+
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+ if got := filesHaveSameContents(fileA, fileB); got != tt.equal {
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+ t.Errorf("filesHaveSameContents() = %v, want %v", got, tt.equal)
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+ }
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+ })
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+ }
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+}
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