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diff --git a/Firestore/Example/Tests/Local/FSTPersistenceTestHelpers.mm b/Firestore/Example/Tests/Local/FSTPersistenceTestHelpers.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/Example/Tests/Local/FSTPersistenceTestHelpers.h"
+
+#import "Firestore/Source/Local/FSTLevelDB.h"
+#import "Firestore/Source/Local/FSTLocalSerializer.h"
+#import "Firestore/Source/Local/FSTMemoryPersistence.h"
+#import "Firestore/Source/Model/FSTDatabaseID.h"
+#import "Firestore/Source/Remote/FSTSerializerBeta.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@implementation FSTPersistenceTestHelpers
+
++ (NSString *)levelDBDir {
+  NSError *error;
+  NSFileManager *files = [NSFileManager defaultManager];
+  NSString *dir =
+      [NSTemporaryDirectory() stringByAppendingPathComponent:@"FSTPersistenceTestHelpers"];
+  if ([files fileExistsAtPath:dir]) {
+    // Delete the directory first to ensure isolation between runs.
+    BOOL success = [files removeItemAtPath:dir error:&error];
+    if (!success) {
+      [NSException raise:NSInternalInconsistencyException
+                  format:@"Failed to clean up leveldb path %@: %@", dir, error];
+    }
+  }
+  return dir;
+}
+
++ (FSTLevelDB *)levelDBPersistence {
+  NSString *dir = [self levelDBDir];
+
+  FSTDatabaseID *databaseID = [FSTDatabaseID databaseIDWithProject:@"p" database:@"d"];
+  FSTSerializerBeta *remoteSerializer = [[FSTSerializerBeta alloc] initWithDatabaseID:databaseID];
+  FSTLocalSerializer *serializer =
+      [[FSTLocalSerializer alloc] initWithRemoteSerializer:remoteSerializer];
+  FSTLevelDB *db = [[FSTLevelDB alloc] initWithDirectory:dir serializer:serializer];
+  NSError *error;
+  BOOL success = [db start:&error];
+  if (!success) {
+    [NSException raise:NSInternalInconsistencyException
+                format:@"Failed to create leveldb path %@: %@", dir, error];
+  }
+
+  return db;
+}
+
++ (FSTMemoryPersistence *)memoryPersistence {
+  NSError *error;
+  FSTMemoryPersistence *persistence = [FSTMemoryPersistence persistence];
+  BOOL success = [persistence start:&error];
+  if (!success) {
+    [NSException raise:NSInternalInconsistencyException
+                format:@"Failed to start memory persistence: %@", error];
+  }
+
+  return persistence;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END