}
	}
}

type testFileSystem struct {
	open func(name string) (File, error)
}

func (fs *testFileSystem) Open(name string) (File, error) {
	return fs.open(name)
}

func TestFileServerCleans(t *testing.T) {
	defer afterTest(t)
	ch := make(chan string, 1)
	fs := FileServer(&testFileSystem{func(name string) (File, error) {
		ch <- name
		return nil, errors.New("file does not exist")
	}})