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// Copyright 2014 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 testing_test
import (
"os"
"path/filepath"
"testing"
)
// This is exactly what a test would do without a TestMain.
// It's here only so that there is at least one package in the
// standard library with a TestMain, so that code is executed.
func TestMain(m *testing.M) {
os.Exit(m.Run())
}
func TestTempDirInCleanup(t *testing.T) {
var dir string
t.Run("test", func(t *testing.T) {
t.Cleanup(func() {
dir = t.TempDir()
})
_ = t.TempDir()
})
fi, err := os.Stat(dir)
if fi != nil {
t.Fatalf("Directory %q from user Cleanup still exists", dir)
}
if !os.IsNotExist(err) {
t.Fatalf("Unexpected error: %v", err)
}
}
func TestTempDirInBenchmark(t *testing.T) {
testing.Benchmark(func(b *testing.B) {
if !b.Run("test", func(b *testing.B) {
// Add a loop so that the test won't fail. See issue 38677.
for i := 0; i < b.N; i++ {
_ = b.TempDir()
}
}) {
t.Fatal("Sub test failure in a benchmark")
}
})
}
func TestTempDir(t *testing.T) {
testTempDir(t)
t.Run("InSubtest", testTempDir)
t.Run("test/subtest", testTempDir)
t.Run("test\\subtest", testTempDir)
t.Run("test:subtest", testTempDir)
t.Run("test/..", testTempDir)
t.Run("../test", testTempDir)
}
func testTempDir(t *testing.T) {
dirCh := make(chan string, 1)
t.Cleanup(func() {
// Verify directory has been removed.
select {
case dir := <-dirCh:
fi, err := os.Stat(dir)
if os.IsNotExist(err) {
// All good
return
}
if err != nil {
t.Fatal(err)
}
t.Errorf("directory %q stil exists: %v, isDir=%v", dir, fi, fi.IsDir())
default:
if !t.Failed() {
t.Fatal("never received dir channel")
}
}
})
dir := t.TempDir()
if dir == "" {
t.Fatal("expected dir")
}
dir2 := t.TempDir()
if dir == dir2 {
t.Fatal("subsequent calls to TempDir returned the same directory")
}
if filepath.Dir(dir) != filepath.Dir(dir2) {
t.Fatalf("calls to TempDir do not share a parent; got %q, %q", dir, dir2)
}
dirCh <- dir
fi, err := os.Stat(dir)
if err != nil {
t.Fatal(err)
}
if !fi.IsDir() {
t.Errorf("dir %q is not a dir", dir)
}
files, err := os.ReadDir(dir)
if err != nil {
t.Fatal(err)
}
if len(files) > 0 {
t.Errorf("unexpected %d files in TempDir: %v", len(files), files)
}
}
func TestSetenv(t *testing.T) {
tests := []struct {
name string
key string
initialValueExists bool
initialValue string
newValue string
}{
{
name: "initial value exists",
key: "GO_TEST_KEY_1",
initialValueExists: true,
initialValue: "111",
newValue: "222",
},
{
name: "initial value exists but empty",
key: "GO_TEST_KEY_2",
initialValueExists: true,
initialValue: "",
newValue: "222",
},
{
name: "initial value is not exists",
key: "GO_TEST_KEY_3",
initialValueExists: false,
initialValue: "",
newValue: "222",
},
}
for _, test := range tests {
if test.initialValueExists {
if err := os.Setenv(test.key, test.initialValue); err != nil {
t.Fatalf("unable to set env: got %v", err)
}
} else {
os.Unsetenv(test.key)
}
t.Run(test.name, func(t *testing.T) {
t.Setenv(test.key, test.newValue)
if os.Getenv(test.key) != test.newValue {
t.Fatalf("unexpected value after t.Setenv: got %s, want %s", os.Getenv(test.key), test.newValue)
}
})
got, exists := os.LookupEnv(test.key)
if got != test.initialValue {
t.Fatalf("unexpected value after t.Setenv cleanup: got %s, want %s", got, test.initialValue)
}
if exists != test.initialValueExists {
t.Fatalf("unexpected value after t.Setenv cleanup: got %t, want %t", exists, test.initialValueExists)
}
}
}
func TestSetenvWithParallelAfterSetenv(t *testing.T) {
defer func() {
want := "testing: t.Parallel called after t.Setenv; cannot set environment variables in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
t.Setenv("GO_TEST_KEY_1", "value")
t.Parallel()
}
func TestSetenvWithParallelBeforeSetenv(t *testing.T) {
defer func() {
want := "testing: t.Setenv called after t.Parallel; cannot set environment variables in parallel tests"
if got := recover(); got != want {
t.Fatalf("expected panic; got %#v want %q", got, want)
}
}()
t.Parallel()
t.Setenv("GO_TEST_KEY_1", "value")
}
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