[Sync] Add ModelTypeStore implementation.

sync/internal_api/model_type_store_impl_unittest.cc

Index: sync/internal_api/model_type_store_impl_unittest.cc
diff --git a/sync/internal_api/model_type_store_impl_unittest.cc b/sync/internal_api/model_type_store_impl_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9bba03123074f20da7ba5aa2a77ec48aff42deea
--- /dev/null
+++ b/sync/internal_api/model_type_store_impl_unittest.cc
@@ -0,0 +1,51 @@
+// 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.
+
+#include "sync/internal_api/public/model_type_store_impl.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace syncer_v2 {
+
+class ModelTypeStoreImplTest : public testing::Test {
+ public:
+  void TearDown() override {
+    if (store_) {
+      store_.reset();
+      PumpLoop();
+    }
+  }
+
+  ModelTypeStore* store() { return store_.get(); }
+
+  void OnInitDone(ModelTypeStore::Result result,
+                  scoped_ptr<ModelTypeStore> store) {
+    ASSERT_EQ(ModelTypeStore::Result::SUCCESS, result);
+    store_ = store.Pass();
+  }
+
+  void PumpLoop() {
+    base::RunLoop run_loop;
+    run_loop.RunUntilIdle();
+  }
+
+ private:
+  base::MessageLoop message_loop_;
+  scoped_ptr<ModelTypeStore> store_;
+};
+
+// Test that CreateInMemoryStoreForTest triggers store initialization that
+// results with callback being calleds with valid store pointer.
+TEST_F(ModelTypeStoreImplTest, CreateInMemoryStore) {
+  ModelTypeStore::CreateInMemoryStoreForTest(
+      base::Bind(&ModelTypeStoreImplTest::OnInitDone, base::Unretained(this)));
+  ASSERT_EQ(nullptr, store());
+  PumpLoop();
+  ASSERT_NE(nullptr, store());
+}
+
+}  // namespace syncer_v2