diff --git a/lib/src/resources/firestore_provider.dart b/lib/src/resources/firestore_provider.dart
index 078f277..e96d510 100644
--- a/lib/src/resources/firestore_provider.dart
+++ b/lib/src/resources/firestore_provider.dart
@@ -15,9 +15,10 @@ import '../models/task_model.dart';
 ///
 /// Implempents CRUD operations for users, tasks and events.
 class FirestoreProvider {
-  final Firestore firestore = Firestore.instance;
+  final Firestore firestore;
 
-  FirestoreProvider() {
+  FirestoreProvider([Firestore firestore])
+      : this.firestore = firestore ?? Firestore.instance {
     firestore.settings(timestampsInSnapshotsEnabled: true);
   }
   //-----------------------User related operations------------------------------