Add mux type to watch package

pkg/watch/mux_test.go

@@ -0,0 +1,90 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+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 (
+	"reflect"
+	"sync"
+	"testing"
+)
+
+func TestMux(t *testing.T) {
+	type myType struct {
+		ID    string
+		Value string
+	}
+	table := []Event{
+		{Added, myType{"foo", "hello world 1"}},
+		{Added, myType{"bar", "hello world 2"}},
+		{Modified, myType{"foo", "goodbye world 3"}},
+		{Deleted, myType{"bar", "hello world 4"}},
+	}
+
+	// The mux we're testing
+	m := NewMux(0)
+
+	// Add a bunch of watchers
+	const testWatchers = 2
+	wg := sync.WaitGroup{}
+	wg.Add(testWatchers)
+	for i := 0; i < testWatchers; i++ {
+		// Verify that each watcher gets the events in the correct order
+		go func(watcher int, w Interface) {
+			tableLine := 0
+			for {
+				event, ok := <-w.ResultChan()
+				if !ok {
+					break
+				}
+				if e, a := table[tableLine], event; !reflect.DeepEqual(e, a) {
+					t.Errorf("Watcher %v, line %v: Expected (%v, %#v), got (%v, %#v)",
+						watcher, tableLine, e.Type, e.Object, a.Type, a.Object)
+				} else {
+					t.Logf("Got (%v, %#v)", event.Type, event.Object)
+				}
+				tableLine++
+			}
+			wg.Done()
+		}(i, m.Watch())
+	}
+
+	for i, item := range table {
+		t.Logf("Sending %v", i)
+		m.Action(item.Type, item.Object)
+	}
+
+	m.Shutdown()
+
+	wg.Wait()
+}
+
+func TestMuxWatcherClose(t *testing.T) {
+	m := NewMux(0)
+	w := m.Watch()
+	w2 := m.Watch()
+	w.Stop()
+	m.Shutdown()
+	if _, open := <-w.ResultChan(); open {
+		t.Errorf("Stop didn't work?")
+	}
+	if _, open := <-w2.ResultChan(); open {
+		t.Errorf("Shutdown didn't work?")
+	}
+	// Extra stops don't hurt things
+	w.Stop()
+	w2.Stop()
+}