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// Copyright 2011 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 main
import (
"bytes"
"flag"
"io/ioutil"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"testing"
"text/scanner"
)
var update = flag.Bool("update", false, "update .golden files")
// gofmtFlags looks for a comment of the form
//
// //gofmt flags
//
// within the first maxLines lines of the given file,
// and returns the flags string, if any. Otherwise it
// returns the empty string.
func gofmtFlags(filename string, maxLines int) string {
f, err := os.Open(filename)
if err != nil {
return "" // ignore errors - they will be found later
}
defer f.Close()
// initialize scanner
var s scanner.Scanner
s.Init(f)
s.Error = func(*scanner.Scanner, string) {} // ignore errors
s.Mode = scanner.GoTokens &^ scanner.SkipComments // want comments
// look for //gofmt comment
for s.Line <= maxLines {
switch s.Scan() {
case scanner.Comment:
const prefix = "//gofmt "
if t := s.TokenText(); strings.HasPrefix(t, prefix) {
return strings.TrimSpace(t[len(prefix):])
}
case scanner.EOF:
return ""
}
}
return ""
}
func runTest(t *testing.T, in, out string) {
// process flags
*simplifyAST = false
*rewriteRule = ""
stdin := false
for _, flag := range strings.Split(gofmtFlags(in, 20), " ") {
elts := strings.SplitN(flag, "=", 2)
name := elts[0]
value := ""
if len(elts) == 2 {
value = elts[1]
}
switch name {
case "":
// no flags
case "-r":
*rewriteRule = value
case "-s":
*simplifyAST = true
case "-stdin":
// fake flag - pretend input is from stdin
stdin = true
default:
t.Errorf("unrecognized flag name: %s", name)
}
}
initParserMode()
initRewrite()
var buf bytes.Buffer
err := processFile(in, nil, &buf, stdin)
if err != nil {
t.Error(err)
return
}
expected, err := ioutil.ReadFile(out)
if err != nil {
t.Error(err)
return
}
if got := buf.Bytes(); !bytes.Equal(got, expected) {
if *update {
if in != out {
if err := ioutil.WriteFile(out, got, 0666); err != nil {
t.Error(err)
}
return
}
// in == out: don't accidentally destroy input
t.Errorf("WARNING: -update did not rewrite input file %s", in)
}
t.Errorf("(gofmt %s) != %s (see %s.gofmt)", in, out, in)
d, err := diff(expected, got, in)
if err == nil {
t.Errorf("%s", d)
}
if err := ioutil.WriteFile(in+".gofmt", got, 0666); err != nil {
t.Error(err)
}
}
}
// TestRewrite processes testdata/*.input files and compares them to the
// corresponding testdata/*.golden files. The gofmt flags used to process
// a file must be provided via a comment of the form
//
// //gofmt flags
//
// in the processed file within the first 20 lines, if any.
func TestRewrite(t *testing.T) {
// determine input files
match, err := filepath.Glob("testdata/*.input")
if err != nil {
t.Fatal(err)
}
// add larger examples
match = append(match, "gofmt.go", "gofmt_test.go")
for _, in := range match {
out := in // for files where input and output are identical
if strings.HasSuffix(in, ".input") {
out = in[:len(in)-len(".input")] + ".golden"
}
runTest(t, in, out)
if in != out {
// Check idempotence.
runTest(t, out, out)
}
}
}
// Test case for issue 3961.
func TestCRLF(t *testing.T) {
const input = "testdata/crlf.input" // must contain CR/LF's
const golden = "testdata/crlf.golden" // must not contain any CR's
data, err := ioutil.ReadFile(input)
if err != nil {
t.Error(err)
}
if !bytes.Contains(data, []byte("\r\n")) {
t.Errorf("%s contains no CR/LF's", input)
}
data, err = ioutil.ReadFile(golden)
if err != nil {
t.Error(err)
}
if bytes.Contains(data, []byte("\r")) {
t.Errorf("%s contains CR's", golden)
}
}
func TestBackupFile(t *testing.T) {
dir, err := ioutil.TempDir("", "gofmt_test")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
name, err := backupFile(filepath.Join(dir, "foo.go"), []byte(" package main"), 0644)
if err != nil {
t.Fatal(err)
}
t.Logf("Created: %s", name)
}
func TestDiff(t *testing.T) {
if _, err := exec.LookPath("diff"); err != nil {
t.Skipf("skip test on %s: diff command is required", runtime.GOOS)
}
in := []byte("first\nsecond\n")
out := []byte("first\nthird\n")
filename := "difftest.txt"
b, err := diff(in, out, filename)
if err != nil {
t.Fatal(err)
}
if runtime.GOOS == "windows" {
b = bytes.ReplaceAll(b, []byte{'\r', '\n'}, []byte{'\n'})
}
bs := bytes.SplitN(b, []byte{'\n'}, 3)
line0, line1 := bs[0], bs[1]
if prefix := "--- difftest.txt.orig"; !bytes.HasPrefix(line0, []byte(prefix)) {
t.Errorf("diff: first line should start with `%s`\ngot: %s", prefix, line0)
}
if prefix := "+++ difftest.txt"; !bytes.HasPrefix(line1, []byte(prefix)) {
t.Errorf("diff: second line should start with `%s`\ngot: %s", prefix, line1)
}
want := `@@ -1,2 +1,2 @@
first
-second
+third
`
if got := string(bs[2]); got != want {
t.Errorf("diff: got:\n%s\nwant:\n%s", got, want)
}
}
func TestReplaceTempFilename(t *testing.T) {
diff := []byte(`--- /tmp/tmpfile1 2017-02-08 00:53:26.175105619 +0900
+++ /tmp/tmpfile2 2017-02-08 00:53:38.415151275 +0900
@@ -1,2 +1,2 @@
first
-second
+third
`)
want := []byte(`--- path/to/file.go.orig 2017-02-08 00:53:26.175105619 +0900
+++ path/to/file.go 2017-02-08 00:53:38.415151275 +0900
@@ -1,2 +1,2 @@
first
-second
+third
`)
// Check path in diff output is always slash regardless of the
// os.PathSeparator (`/` or `\`).
sep := string(os.PathSeparator)
filename := strings.Join([]string{"path", "to", "file.go"}, sep)
got, err := replaceTempFilename(diff, filename)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(got, want) {
t.Errorf("os.PathSeparator='%s': replacedDiff:\ngot:\n%s\nwant:\n%s", sep, got, want)
}
}