Split implementations from generic code

core/pkg/watch/file_watcher_test.go

@@ -0,0 +1,45 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package watch
+
+import (
+	"io/ioutil"
+	"testing"
+)
+
+func TestFileWatcher(t *testing.T) {
+	file, err := ioutil.TempFile("", "fw")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	defer file.Close()
+	count := 0
+	fw, err := NewFileWatcher(file.Name(), func() {
+		count++
+		if count != 1 {
+			t.Fatalf("expected 1 but returned %v", count)
+		}
+	})
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	defer fw.Close()
+	if count != 0 {
+		t.Fatalf("expected 0 but returned %v", count)
+	}
+	ioutil.WriteFile(file.Name(), []byte{}, 0644)
+}