genericize ip cache

pkg/util/time_cache_test.go

@@ -0,0 +1,63 @@
+/*
+Copyright 2015 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 util
+
+import (
+	"testing"
+	"time"
+)
+
+func TestCacheExpire(t *testing.T) {
+	calls := map[string]int{}
+	ff := func(key string) T { calls[key]++; return key }
+	clock := &FakeClock{time.Now()}
+
+	c := NewTimeCache(clock, 60*time.Second, ff)
+
+	c.Get("foo")
+	c.Get("bar")
+	// This call should hit the cache, so we expect no additional calls
+	c.Get("foo")
+	// Advance the clock, this call should miss the cache, so expect one more call.
+	clock.Time = clock.Time.Add(61 * time.Second)
+	c.Get("foo")
+	c.Get("bar")
+
+	if e, a := 2, calls["foo"]; e != a {
+		t.Errorf("Wrong number of calls for foo: wanted %v, got %v", e, a)
+	}
+	if e, a := 2, calls["bar"]; e != a {
+		t.Errorf("Wrong number of calls for bar: wanted %v, got %v", e, a)
+	}
+}
+
+func TestCacheNotExpire(t *testing.T) {
+	calls := map[string]int{}
+	ff := func(key string) T { calls[key]++; return key }
+	clock := &FakeClock{time.Now()}
+
+	c := NewTimeCache(clock, 60*time.Second, ff)
+
+	c.Get("foo")
+	// This call should hit the cache, so we expect no additional calls to the cloud
+	clock.Time = clock.Time.Add(60 * time.Second)
+	c.Get("foo")
+
+	if e, a := 1, calls["foo"]; e != a {
+		t.Errorf("Wrong number of calls for foo: wanted %v, got %v", e, a)
+	}
+}