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package atomicfile_test
import (
"bytes"
"io/ioutil"
"os"
"testing"
"github.com/facebookgo/atomicfile"
)
func test(t *testing.T, dir, prefix string) {
t.Parallel()
tmpfile, err := ioutil.TempFile(dir, prefix)
if err != nil {
t.Fatal(err)
}
name := tmpfile.Name()
if err := os.Remove(name); err != nil {
t.Fatal(err)
}
defer os.Remove(name)
f, err := atomicfile.New(name, os.FileMode(0666))
if err != nil {
t.Fatal(err)
}
f.Write([]byte("foo"))
if _, err := os.Stat(name); !os.IsNotExist(err) {
t.Fatal("did not expect file to exist")
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(name); err != nil {
t.Fatalf("expected file to exist: %s", err)
}
}
func TestCurrentDir(t *testing.T) {
cwd, _ := os.Getwd()
test(t, cwd, "atomicfile-current-dir-")
}
func TestRootTmpDir(t *testing.T) {
test(t, "/tmp", "atomicfile-root-tmp-dir-")
}
func TestDefaultTmpDir(t *testing.T) {
test(t, "", "atomicfile-default-tmp-dir-")
}
func TestAbort(t *testing.T) {
contents := []byte("the answer is 42")
t.Parallel()
tmpfile, err := ioutil.TempFile("", "atomicfile-abort-")
if err != nil {
t.Fatal(err)
}
name := tmpfile.Name()
if _, err := tmpfile.Write(contents); err != nil {
t.Fatal(err)
}
defer os.Remove(name)
f, err := atomicfile.New(name, os.FileMode(0666))
if err != nil {
t.Fatal(err)
}
f.Write([]byte("foo"))
if err := f.Abort(); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(name); err != nil {
t.Fatalf("expected file to exist: %s", err)
}
actual, err := ioutil.ReadFile(name)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(contents, actual) {
t.Fatalf(`did not find expected "%s" instead found "%s"`, contents, actual)
}
}
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