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