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diff --git a/GoogleUtilities/Example/Tests/Network/GULMutableDictionaryTest.m b/GoogleUtilities/Example/Tests/Network/GULMutableDictionaryTest.m
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+++ b/GoogleUtilities/Example/Tests/Network/GULMutableDictionaryTest.m
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+// Copyright 2018 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 <GoogleUtilities/GULMutableDictionary.h>
+
+const static NSString *const kKey = @"testKey1";
+const static NSString *const kValue = @"testValue1";
+const static NSString *const kKey2 = @"testKey2";
+const static NSString *const kValue2 = @"testValue2";
+
+@interface GULMutableDictionaryTest : XCTestCase
+@property(nonatomic) GULMutableDictionary *dictionary;
+@end
+
+@implementation GULMutableDictionaryTest
+
+- (void)setUp {
+  [super setUp];
+  self.dictionary = [[GULMutableDictionary alloc] init];
+}
+
+- (void)tearDown {
+  self.dictionary = nil;
+  [super tearDown];
+}
+
+- (void)testSetGetAndRemove {
+  XCTAssertNil([self.dictionary objectForKey:kKey]);
+  [self.dictionary setObject:kValue forKey:kKey];
+  XCTAssertEqual(kValue, [self.dictionary objectForKey:kKey]);
+  [self.dictionary removeObjectForKey:kKey];
+  XCTAssertNil([self.dictionary objectForKey:kKey]);
+}
+
+- (void)testSetGetAndRemoveKeyed {
+  XCTAssertNil(self.dictionary[kKey]);
+  self.dictionary[kKey] = kValue;
+  XCTAssertEqual(kValue, self.dictionary[kKey]);
+  [self.dictionary removeObjectForKey:kKey];
+  XCTAssertNil(self.dictionary[kKey]);
+}
+
+- (void)testRemoveAll {
+  XCTAssertNil(self.dictionary[kKey]);
+  XCTAssertNil(self.dictionary[kKey2]);
+  self.dictionary[kKey] = kValue;
+  self.dictionary[kKey2] = kValue2;
+  [self.dictionary removeAllObjects];
+  XCTAssertNil(self.dictionary[kKey]);
+  XCTAssertNil(self.dictionary[kKey2]);
+}
+
+- (void)testCount {
+  XCTAssertEqual([self.dictionary count], 0);
+  self.dictionary[kKey] = kValue;
+  XCTAssertEqual([self.dictionary count], 1);
+  self.dictionary[kKey2] = kValue2;
+  XCTAssertEqual([self.dictionary count], 2);
+  [self.dictionary removeAllObjects];
+  XCTAssertEqual([self.dictionary count], 0);
+}
+
+- (void)testUnderlyingDictionary {
+  XCTAssertEqual([self.dictionary count], 0);
+  self.dictionary[kKey] = kValue;
+  self.dictionary[kKey2] = kValue2;
+
+  NSDictionary *dict = self.dictionary.dictionary;
+  XCTAssertEqual([dict count], 2);
+  XCTAssertEqual(dict[kKey], kValue);
+  XCTAssertEqual(dict[kKey2], kValue2);
+}
+
+@end