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diff --git a/Firestore/Example/Tests/Local/FSTReferenceSetTests.m b/Firestore/Example/Tests/Local/FSTReferenceSetTests.m
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+++ b/Firestore/Example/Tests/Local/FSTReferenceSetTests.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 "Local/FSTReferenceSet.h"
+
+#import <XCTest/XCTest.h>
+
+#import "Model/FSTDocumentKey.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FSTReferenceSetTests : XCTestCase
+@end
+
+@implementation FSTReferenceSetTests
+
+- (void)testAddOrRemoveReferences {
+  FSTDocumentKey *key = [FSTDocumentKey keyWithPathString:@"foo/bar"];
+
+  FSTReferenceSet *referenceSet = [[FSTReferenceSet alloc] init];
+  XCTAssertTrue([referenceSet isEmpty]);
+  XCTAssertFalse([referenceSet containsKey:key]);
+
+  [referenceSet addReferenceToKey:key forID:1];
+  XCTAssertTrue([referenceSet containsKey:key]);
+  XCTAssertFalse([referenceSet isEmpty]);
+
+  [referenceSet addReferenceToKey:key forID:2];
+  XCTAssertTrue([referenceSet containsKey:key]);
+
+  [referenceSet removeReferenceToKey:key forID:1];
+  XCTAssertTrue([referenceSet containsKey:key]);
+
+  [referenceSet removeReferenceToKey:key forID:3];
+  XCTAssertTrue([referenceSet containsKey:key]);
+
+  [referenceSet removeReferenceToKey:key forID:2];
+  XCTAssertFalse([referenceSet containsKey:key]);
+  XCTAssertTrue([referenceSet isEmpty]);
+}
+
+- (void)testRemoveAllReferencesForTargetID {
+  FSTDocumentKey *key1 = [FSTDocumentKey keyWithPathString:@"foo/bar"];
+  FSTDocumentKey *key2 = [FSTDocumentKey keyWithPathString:@"foo/baz"];
+  FSTDocumentKey *key3 = [FSTDocumentKey keyWithPathString:@"foo/blah"];
+  FSTReferenceSet *referenceSet = [[FSTReferenceSet alloc] init];
+
+  [referenceSet addReferenceToKey:key1 forID:1];
+  [referenceSet addReferenceToKey:key2 forID:1];
+  [referenceSet addReferenceToKey:key3 forID:2];
+  XCTAssertFalse([referenceSet isEmpty]);
+  XCTAssertTrue([referenceSet containsKey:key1]);
+  XCTAssertTrue([referenceSet containsKey:key2]);
+  XCTAssertTrue([referenceSet containsKey:key3]);
+
+  [referenceSet removeReferencesForID:1];
+  XCTAssertFalse([referenceSet isEmpty]);
+  XCTAssertFalse([referenceSet containsKey:key1]);
+  XCTAssertFalse([referenceSet containsKey:key2]);
+  XCTAssertTrue([referenceSet containsKey:key3]);
+
+  [referenceSet removeReferencesForID:2];
+  XCTAssertTrue([referenceSet isEmpty]);
+  XCTAssertFalse([referenceSet containsKey:key1]);
+  XCTAssertFalse([referenceSet containsKey:key2]);
+  XCTAssertFalse([referenceSet containsKey:key3]);
+}
+
+@end
+
+NS_ASSUME_NONNULL_END