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Tests

Modular provides tools make unit testing and route and injection integration easier. In this session we'll learn how to do this.

First you need add the modular_test to pubspec.yaml:


dev_dependencies:  modular_test: any
TIP

Flutter's CLI has a tool that makes package installation easier in the project. Use the command:

flutter pub add --dev modular_test

Route Test#

We can replace the navigation object with a Mock/Fake by injecting the Modular.navigatorDelegate property:

class ModularNavigateMock extends Mock implements IModularNavigator {}
void main(){    final navigate = ModularNavigateMock();    Modular.navigatorDelegate = navigate;}
TIP

Prefer to use Mockito or Mocktail to create mocks.

TIP

To get navigate History use Modular.navigatorDelegate.navigateHistory

Injection Test#

The safest way possible to inject dependencies is to test if the Bind construction happens as expected, then we'll need to check this through the test.

The modular_test package has some tools to initializing modules and replacing binds with mock. Let's take look at the example below:

class MyModule extends Module {  @override  List<Bind> get binds => [    Bind.factory<Dio>((i) => Dio())    Bind.factory((i) => XPTOEmail(i()))    Bind.factory<EmailService>((i) => XPTOEmailService(i()))    Bind.singleton((i) => Client(i()))  ];}... class DioMock extends Mock implements DioForNative {}
main(){    final dioMock = DioMock();
    setUp((){        initModule(MyModule(), replaceBinds: [            Bind.instance<Dio>(dioMock),        ]);    });}
ATTENTION

In order for a bind to be eligible for replacement, the Bind MUST have the type declared in the Bind constructor. (ex: Bind<MyObjectType>());