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diff --git a/Firestore/Example/Tests/Local/FSTEagerGarbageCollectorTests.mm b/Firestore/Example/Tests/Local/FSTEagerGarbageCollectorTests.mm
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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 "Firestore/Source/Local/FSTEagerGarbageCollector.h"
+
+#import <XCTest/XCTest.h>
+
+#import "Firestore/Source/Local/FSTReferenceSet.h"
+#import "Firestore/Source/Model/FSTDocumentKey.h"
+
+#import "Firestore/Example/Tests/Util/FSTHelpers.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface FSTEagerGarbageCollectorTests : XCTestCase
+@end
+
+@implementation FSTEagerGarbageCollectorTests
+
+- (void)testAddOrRemoveReferences {
+  FSTEagerGarbageCollector *gc = [[FSTEagerGarbageCollector alloc] init];
+  FSTReferenceSet *referenceSet = [[FSTReferenceSet alloc] init];
+  [gc addGarbageSource:referenceSet];
+
+  FSTDocumentKey *key = FSTTestDocKey(@"foo/bar");
+  [referenceSet addReferenceToKey:key forID:1];
+  FSTAssertEqualSets([gc collectGarbage], @[]);
+  XCTAssertFalse([referenceSet isEmpty]);
+
+  [referenceSet removeReferenceToKey:key forID:1];
+  FSTAssertEqualSets([gc collectGarbage], @[ key ]);
+  XCTAssertTrue([referenceSet isEmpty]);
+}
+
+- (void)testRemoveAllReferencesForID {
+  FSTEagerGarbageCollector *gc = [[FSTEagerGarbageCollector alloc] init];
+  FSTReferenceSet *referenceSet = [[FSTReferenceSet alloc] init];
+  [gc addGarbageSource:referenceSet];
+
+  FSTDocumentKey *key1 = FSTTestDocKey(@"foo/bar");
+  FSTDocumentKey *key2 = FSTTestDocKey(@"foo/baz");
+  FSTDocumentKey *key3 = FSTTestDocKey(@"foo/blah");
+  [referenceSet addReferenceToKey:key1 forID:1];
+  [referenceSet addReferenceToKey:key2 forID:1];
+  [referenceSet addReferenceToKey:key3 forID:2];
+  XCTAssertFalse([referenceSet isEmpty]);
+
+  [referenceSet removeReferencesForID:1];
+  FSTAssertEqualSets([gc collectGarbage], (@[ key1, key2 ]));
+  XCTAssertFalse([referenceSet isEmpty]);
+
+  [referenceSet removeReferencesForID:2];
+  FSTAssertEqualSets([gc collectGarbage], @[ key3 ]);
+  XCTAssertTrue([referenceSet isEmpty]);
+}
+
+- (void)testTwoReferenceSetsAtTheSameTime {
+  FSTReferenceSet *remoteTargets = [[FSTReferenceSet alloc] init];
+  FSTReferenceSet *localViews = [[FSTReferenceSet alloc] init];
+  FSTReferenceSet *mutations = [[FSTReferenceSet alloc] init];
+
+  FSTEagerGarbageCollector *gc = [[FSTEagerGarbageCollector alloc] init];
+  [gc addGarbageSource:remoteTargets];
+  [gc addGarbageSource:localViews];
+  [gc addGarbageSource:mutations];
+
+  FSTDocumentKey *key1 = FSTTestDocKey(@"foo/bar");
+  [remoteTargets addReferenceToKey:key1 forID:1];
+  [localViews addReferenceToKey:key1 forID:1];
+  [mutations addReferenceToKey:key1 forID:10];
+
+  FSTDocumentKey *key2 = FSTTestDocKey(@"foo/baz");
+  [mutations addReferenceToKey:key2 forID:10];
+
+  XCTAssertFalse([remoteTargets isEmpty]);
+  XCTAssertFalse([localViews isEmpty]);
+  XCTAssertFalse([mutations isEmpty]);
+
+  [localViews removeReferencesForID:1];
+  FSTAssertEqualSets([gc collectGarbage], @[]);
+
+  [remoteTargets removeReferencesForID:1];
+  FSTAssertEqualSets([gc collectGarbage], @[]);
+
+  [mutations removeReferenceToKey:key1 forID:10];
+  FSTAssertEqualSets([gc collectGarbage], @[ key1 ]);
+
+  [mutations removeReferenceToKey:key2 forID:10];
+  FSTAssertEqualSets([gc collectGarbage], @[ key2 ]);
+
+  XCTAssertTrue([remoteTargets isEmpty]);
+  XCTAssertTrue([localViews isEmpty]);
+  XCTAssertTrue([mutations isEmpty]);
+}
+
+@end
+
+NS_ASSUME_NONNULL_END