Fix merge

Author: schmidt-sebastian

packages/firestore/test/unit/specs/spec_test_components.ts

@@ -51,8 +51,10 @@ export class MockMemoryPersistence extends MemoryPersistence {
       transaction: PersistenceTransaction
     ) => PersistencePromise<T>
   ): Promise<T> {
-    if (this.injectFailures) {
-      return Promise.reject(new Error('Injected Failure'));
+    if (this.injectFailures) { 
+      return Promise.reject(
+        new IndexedDbTransactionError(new Error('Simulated retryable error'))
+      );
     } else {
       return super.runTransaction(action, mode, transactionOperation);
     }