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fswatch_test.go
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fswatch_test.go
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// Copyright 2013 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 fswatch
import (
"io/ioutil"
"os"
"path/filepath"
"testing"
"time"
)
// watcher is platform dependent. This check ensures that all
// watcher implementations conform to the specification.
var _ interface {
add(string) error
} = &watcher{}
// event is platform dependant. Events are passed as pointers,
// not interfaces to allow inlining to operate effectively. This
// check ensures all event implementations confirm to the
// specificatoin
var _ interface {
IsCreate() bool
IsRemove() bool
} = &event{}
// setup creates a temporary working directory, and a cleanup function.
func setup(t *testing.T) (string, func()) {
d, err := ioutil.TempDir("", "fswatch-")
if err != nil {
t.Fatal(err)
}
return d, func() {
os.RemoveAll(d)
}
}
func assert(t *testing.T, err error) {
if err != nil {
t.Fatal(err)
}
}
func expect(t *testing.T, expected, actual error) {
if expected != actual {
t.Fatalf("expected: %v, actual: %v", expected, actual)
}
}
func mkdir(t *testing.T, dir string) {
assert(t, os.Mkdir(dir, 0777))
}
func newdir(t *testing.T, dir string) string {
p, err := ioutil.TempDir(dir, "dir")
assert(t, err)
return p
}
func newfile(t *testing.T, dir string) *os.File {
f, err := ioutil.TempFile(dir, "file")
assert(t, err)
return f
}
type mockevent struct {
create, remove bool
}
func (e *mockevent) IsCreate() bool { return e.create }
func (e *mockevent) IsRemove() bool { return e.remove }
func checkevent(t *testing.T, expected, actual interface {
IsCreate() bool
IsRemove() bool
},) {
if expected.IsCreate() != actual.IsCreate() {
t.Errorf("Event.IsCreate: expected %v, actual %v", expected.IsCreate(), actual.IsCreate())
}
if expected.IsRemove() != actual.IsRemove() {
t.Errorf("Event.IsRemove: expected %v, actual %v", expected.IsRemove(), actual.IsRemove())
}
}
func checkstring(t *testing.T, expected, actual string) {
if expected != actual {
t.Errorf("expected: %q, actual %q", expected, actual)
}
}
func TestNewWatcher(t *testing.T) {
w, err := NewWatcher()
assert(t, err)
assert(t, w.Close())
}
func TestWatcherAddPath(t *testing.T) {
d, done := setup(t)
defer done()
w, err := NewWatcher()
assert(t, err)
assert(t, w.Add(d))
assert(t, w.Close())
}
func TestWatch(t *testing.T) {
d, done := setup(t)
defer done()
w, err := Watch(d)
assert(t, err)
assert(t, w.Close())
}
func TestWatchMissingPath(t *testing.T) {
d, done := setup(t)
defer done()
w, err := Watch(filepath.Join(d, "missing"))
if err == nil {
w.Close()
t.Fatalf("expected: error, got: %v", err)
}
}
func TestWatchCreateFile(t *testing.T) {
d, done := setup(t)
defer done()
w, err := Watch(d)
assert(t, err)
defer w.Close()
f := newfile(t, d)
defer f.Close()
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, f.Name(), e.Target)
checkevent(t, &mockevent{create: true}, e)
}
}
func TestWatchDeleteFile(t *testing.T) {
d, done := setup(t)
defer done()
f := newfile(t, d)
defer f.Close()
w, err := Watch(d)
assert(t, err)
defer w.Close()
if err := os.Remove(f.Name()); err != nil {
t.Fatal(err)
}
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, f.Name(), e.Target)
checkevent(t, &mockevent{remove: true}, e)
}
}
func TestWatchCreateDir(t *testing.T) {
d, done := setup(t)
defer done()
w, err := Watch(d)
assert(t, err)
defer w.Close()
p := newdir(t, d)
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, p, e.Target)
checkevent(t, &mockevent{create: true}, e)
}
}
func TestWatchDeleteDir(t *testing.T) {
d, done := setup(t)
defer done()
p := newdir(t, d)
w, err := Watch(d)
assert(t, err)
defer w.Close()
if err := os.Remove(p); err != nil {
t.Fatal(err)
}
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, p, e.Target)
checkevent(t, &mockevent{remove: true}, e)
}
}
func TestWatchSelfFile(t *testing.T) {
d, done := setup(t)
defer done()
w, err := Watch(d)
assert(t, err)
defer w.Close()
f := newfile(t, d)
assert(t, err)
defer f.Close()
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, f.Name(), e.Target)
checkevent(t, &mockevent{create: true}, e)
}
}
func TestCannotWatchSameFileTwice(t *testing.T) {
d, done := setup(t)
defer done()
w, err := NewWatcher()
assert(t, err)
defer w.Close()
f := newfile(t, d)
defer f.Close()
assert(t, w.Add(f.Name()))
expect(t, ErrWatchExists, w.Add(f.Name()))
}
func TestCannotWatchSameDirTwice(t *testing.T) {
d, done := setup(t)
defer done()
w, err := NewWatcher()
assert(t, err)
defer w.Close()
d1 := newdir(t, d)
assert(t, w.Add(d1))
expect(t, ErrWatchExists, w.Add(d1))
}
// disabled, hangs on linux
func testCanWatchFileInsideWatchedDir(t *testing.T) {
d, done := setup(t)
defer done()
w, err := NewWatcher()
assert(t, err)
defer w.Close()
d1 := newdir(t, d)
assert(t, w.Add(d1))
f := newfile(t, d1)
defer f.Close()
assert(t, w.Add(f.Name()))
}
func TestWatchTwoPaths(t *testing.T) {
d, done := setup(t)
defer done()
w, err := NewWatcher()
assert(t, err)
defer w.Close()
d1 := newdir(t, d)
d2 := newdir(t, d)
assert(t, w.Add(d1))
assert(t, w.Add(d2))
f := newfile(t, d1)
defer f.Close()
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, f.Name(), e.Target)
checkevent(t, &mockevent{create: true}, e)
}
f = newfile(t, d2)
defer f.Close()
select {
case <-time.After(500 * time.Millisecond):
t.Fatalf("timeout")
case e := <-w.C:
checkstring(t, f.Name(), e.Target)
checkevent(t, &mockevent{create: true}, e)
}
}