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Previously known as cloud_firestore_mocks. Fake implementation of Cloud Firestore. Use this package to unit test apps that use Cloud Firestore.

Fake Cloud Firestore #

pub package

Fakes to write unit tests for Cloud Firestore. Instantiate a FakeFirebaseFirestore, then pass it around your project as if it were a FirebaseFirestore. This fake acts like Firestore except it will only keep the state in memory. To help debug, you can use FakeFirebaseFirestore.dump() to see what's in the fake database. This is useful to set up the state of your database, then check that your UI behaves the way you expect.

Usage #

A simple usage example #

import 'package:fake_cloud_firestore/fake_cloud_firestore.dart';

void main() {
  final instance = FakeFirebaseFirestore();
  await instance.collection('users').add({
    'username': 'Bob',
  final snapshot = await instance.collection('users').get();
  print(snapshot.docs.length); // 1
  print(snapshot.docs.first.get('username')); // 'Bob'

// Prints out:
// {
//   "users": {
//     "z": {
//       "name": "Bob"
//     }
//   }
// }

See more examples at fake_cloud_firestore/test/fake_cloud_firestore_test.dart.

Usage in a UI test: #

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:fake_cloud_firestore/fake_cloud_firestore.dart';
import 'package:firestore_example/main.dart';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';

const MessagesCollection = 'messages';

void main() {
  testWidgets('shows messages', (WidgetTester tester) async {
    // Populate the fake database.
    final firestore = FakeFirebaseFirestore();
    await firestore.collection(MessagesCollection).add({
      'message': 'Hello world!',
      'created_at': FieldValue.serverTimestamp(),

    // Render the widget.
    await tester.pumpWidget(MaterialApp(
        title: 'Firestore Example', home: MyHomePage(firestore: firestore)));
    // Let the snapshots stream fire a snapshot.
    await tester.idle();
    // Re-render.
    await tester.pump();
    // // Verify the output.
    expect(find.text('Hello world!'), findsOneWidget);
    expect(find.text('Message 1 of 1'), findsOneWidget);

See more examples at fake_cloud_firestore/example/test/widget_test.dart.

Features #

  • Dump the state of the fake firebase with FakeFirebaseFirestore.dump().
  • Create documents and collections.
  • Supports Converters.
  • Create documents with collection.add or document.set.
  • Batch writes and runTransaction.
  • Query documents with collection.snapshots or query.get.
  • Queries:
    • Filter results with query.where. The library supports equals, isGreaterThan, isGreaterThanOrEqualTo, isLessThan,isLessThanOrEqualTo, isNull, isNotEqualTo, arrayContains, arrayContainsAny, whereIn and whereNotIn.
    • Sort results with query.orderBy.
    • Limit results with query.limit, limitToLast, startAfterDocument, startAt, startAtDocument, endAt, endAtDocument, endBefore, endBeforeDocument. Note: startAnd and endAt work only on exact matches.
  • ValueField:
    • set timestamps with FieldValue.serverTimestamp().
    • delete values with FieldValue.delete().
    • update numerical values with FieldValue.increment.
    • update arrays with FieldValue.arrayUnion and FieldValue.arrayRemove.

Compatibility table #


Features and bugs #

Please file feature requests and bugs at the issue tracker.

pub points


verified publisher iconwafrat.com

Previously known as cloud_firestore_mocks. Fake implementation of Cloud Firestore. Use this package to unit test apps that use Cloud Firestore.

Repository (GitHub)


API reference


Icon for licenses.BSD-2-Clause (LICENSE)


cloud_firestore, cloud_firestore_platform_interface, collection, flutter, plugin_platform_interface, quiver, rxdart


Packages that depend on fake_cloud_firestore