Vendor dependencies for GCS

vendor/cloud.google.com/go/internal/atomiccache/atomiccache_test.go

@@ -0,0 +1,46 @@
+// Copyright 2016 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 atomiccache
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestGet(t *testing.T) {
+	var c Cache
+	called := false
+	get := func(k interface{}) interface{} {
+		return c.Get(k, func() interface{} {
+			called = true
+			return fmt.Sprintf("v%d", k)
+		})
+	}
+	got := get(1)
+	if want := "v1"; got != want {
+		t.Errorf("got %v, want %v", got, want)
+	}
+	if !called {
+		t.Error("getter not called, expected a call")
+	}
+	called = false
+	got = get(1)
+	if want := "v1"; got != want {
+		t.Errorf("got %v, want %v", got, want)
+	}
+	if called {
+		t.Error("getter unexpectedly called")
+	}
+}