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diff --git a/Example/Auth/Tests/FIRAuthGlobalWorkQueueTests.m b/Example/Auth/Tests/FIRAuthGlobalWorkQueueTests.m
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+/*
+ * Copyright 2017 Google
+ *
+ * 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.
+ */
+
+#import <XCTest/XCTest.h>
+
+#import "FIRAuthGlobalWorkQueue.h"
+
+/** @class FIRAuthGlobalWorkQueueTests
+    @brief Tests for @c FIRAuthGlobalWorkQueue .
+ */
+@interface FIRAuthGlobalWorkQueueTests : XCTestCase
+@end
+@implementation FIRAuthGlobalWorkQueueTests
+
+- (void)testSingleton {
+  dispatch_queue_t queue1 = FIRAuthGlobalWorkQueue();
+  XCTAssertNotNil(queue1);
+  dispatch_queue_t queue2 = FIRAuthGlobalWorkQueue();
+  XCTAssertEqual(queue1, queue2);
+}
+
+@end