Google Cloud Location Tests

Testing with Fakes

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

• Code that uses Locations can be tested by injecting the fake FakeLocations.

Import the fakes from the testing library:

import 'package:google_cloud_location/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_location/location.dart';
import 'package:google_cloud_location/testing.dart';

final fake = FakeLocations(
  getLocation: (request) async {
    // Assert request contents here if needed.
    return Location();
  },
);

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_location/location.dart';
import 'package:google_cloud_location/testing.dart';

final class MyFakeLocations extends FakeLocations {
  @override
  Future<Location> getLocation(
    GetLocationRequest request,
  ) async {
    // Assert request contents here if needed.
    return Location();
  }
}

A Simple Test

import 'package:google_cloud_location/location.dart';
import 'package:google_cloud_location/testing.dart';
import 'package:test/test.dart';

Future<void> functionUnderTest(Locations service) async {
  // Application logic here.
  await service.getLocation(GetLocationRequest());
  // More application logic here.
}

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