+/*
+ * Copyright 2015 Facebook, Inc.
+ *
+ * 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.
+ */
+
+#include <folly/Singleton.h>
+#include <folly/SingletonVault_c.h>
+
+#include <gtest/gtest.h>
+
+#include <thread>
+
+__thread long instance_counter_instances = 0;
+
+class InstanceCounter {
+ public:
+ InstanceCounter() {
+ instance_counter_instances++;
+ }
+
+ ~InstanceCounter() {
+ instance_counter_instances--;
+ }
+};
+
+TEST(SingletonVault, singletonReturnsSingletonInstance) {
+ SingletonVault_t *c = SingletonVault_singleton();
+ auto *cpp = folly::SingletonVault::singleton();
+ EXPECT_EQ(c, cpp);
+}
+
+struct TestTag {};
+template <typename T, typename Tag = folly::detail::DefaultTag>
+using SingletonTest = folly::Singleton <T, Tag, TestTag>;
+
+TEST(SingletonVault, singletonsAreCreatedAndDestroyed) {
+ auto vault = folly::SingletonVault::singleton<TestTag>();
+ SingletonTest<InstanceCounter> counter_singleton;
+ SingletonVault_registrationComplete((SingletonVault_t*) vault);
+ InstanceCounter *counter = SingletonTest<InstanceCounter>::get();
+ EXPECT_EQ(instance_counter_instances, 1);
+ SingletonVault_destroyInstances((SingletonVault_t*) vault);
+ EXPECT_EQ(instance_counter_instances, 0);
+}