Google Cloud Longrunning Tests

Testing with Fakes

Most unit tests should use fakes instead of making network requests to Google services.

• Code that uses Operations can be tested by injecting the fake FakeOperations.

Import the fakes from the testing library:

import 'package:google_cloud_longrunning/testing.dart';

Option A: Using Constructor Closures (Recommended)

You can inject behavior by passing optional function callbacks to the fake's constructor. Methods that are not provided will throw an UnsupportedError.

import 'package:google_cloud_longrunning/longrunning.dart';
import 'package:google_cloud_longrunning/testing.dart';

final fake = FakeOperations(
  deleteOperation: (request) async {
    // Assert request contents here if needed.
  },
);

Option B: Subclassing the Fake

For more complex test setups or shared states, you can subclass the fake and override its methods. Methods that are not overridden will throw an UnsupportedError.

import 'package:google_cloud_longrunning/longrunning.dart';
import 'package:google_cloud_longrunning/testing.dart';

final class MyFakeOperations extends FakeOperations {
  @override
  Future<void> deleteOperation(
    DeleteOperationRequest request,
  ) async {
    // Assert request contents here if needed.
  }
}

A Simple Test

import 'package:google_cloud_longrunning/longrunning.dart';
import 'package:google_cloud_longrunning/testing.dart';
import 'package:test/test.dart';

Future<void> functionUnderTest(Operations service) async {
  // Application logic here.
  await service.deleteOperation(DeleteOperationRequest());
  // More application logic here.
}

void main() {
  test('test', () async {
    final fake = FakeOperations(
      deleteOperation: (request) async {
          // Assert request contents here.
      },
    );
    // Instead of verifying that `functionUnderTest` completes, you should verify
    // the relevant properties of the result.
    await expectLater(functionUnderTest(fake), completes);
  });
}