Add wrappers for the module module

impl/memory/module_test.go

Index: impl/memory/module_test.go
diff --git a/impl/memory/module_test.go b/impl/memory/module_test.go
new file mode 100644
index 0000000000000000000000000000000000000000..2b26956b3a1f72a2c7be01b27c4bb61eb5ca66a9
--- /dev/null
+++ b/impl/memory/module_test.go
@@ -0,0 +1,34 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package memory
+
+import (
+	"testing"
+
+	"github.com/luci/gae/service/module"
+	"golang.org/x/net/context"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestModule(t *testing.T) {
+	Convey("NumInstances", t, func() {
+		c := Use(context.Background())
+		m := module.Get(c)
+
+		i, err := m.NumInstances("foo", "bar")
+		So(i, ShouldEqual, 1)
+		So(err, ShouldBeNil)
+
+		So(m.SetNumInstances("foo", "bar", 42), ShouldBeNil)
+		i, err = m.NumInstances("foo", "bar")
+		So(i, ShouldEqual, 42)
+		So(err, ShouldBeNil)
+
+		i, err = m.NumInstances("foo", "baz")
+		So(i, ShouldEqual, 1)
+		So(err, ShouldBeNil)
+	})
+}