widget_driver_generator 1.3.3

This package provides generators for WidgetDriver to automate the creation of your TestDrivers and WidgetDriverProviders

widget_driver_generator is a helper package that supports the widget_driver package and generates the bootstrapping code needed to get your Drivers fully set up.

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Usage

Dependencies

To use widget_driver_generator, you need to have the following dependencies in your pubspec.yaml.

dependencies:
  # ...along with your other dependencies
  widget_driver: <latest-version>

dev_dependencies:
  # ...along with your other dev-dependencies
  build_runner: <latest-version>
  widget_driver_generator: <latest-version>

Source code

The instructions below explain how to create and annotate your Drivers to use this generator. Along with importing the widget_driver package, it's essential to also include a part directive that references the generated Dart file. The generated file will always have the name [source_file].g.dart.

import 'package:widget_driver/widget_driver.dart';

part 'this_file.g.dart';

After you have organized your import statements it is time to define your Driver. At this point you also need to annotate your Driver class with the GenerateTestDriver() annotation. If you forget to do this, then you will not get any generated code.

@GenerateTestDriver()
class MyDriver extends WidgetDriver {
  ...
}

Now there is just one step missing. Any public properties and methods in your Driver can be annotated so they provide a specific value in tests. Simple return types like all of Dart's built-in types, enums, Optionals and some frequently used types in widgets like Color, IconData and FontWeight are already covered. More complex type, like your custom classes, must be covered in your code.

Annotate the properties you want to explicitly define in the TestDriver with TestDriverDefaultValue({default_value}). As a parameter to the TestDriverDefaultValue you pass in the default value which you want the driver to give to the widget when the widget is being tested.

You can also annotate your methods with TestDriverDefaultValue({default_return_value}). As a parameter to the TestDriverDefaultValue you pass in the default value which you want the driver to return to the widget when the widget calls this method during tests. If the method does not return anything, then just pass nothing as a parameter. If you method returns a future, then you can use the TestDriverDefaultFutureValue annotation instead. It will correctly generate a future with the return value you pass into it.

@GenerateTestDriver()
class MyDriver extends WidgetDriver {
  ...

  int get value => _someService.value;

  @TestDriverDefaultValue(CustomClass())
  CustomClass get value => _counterService.getCustomClass;

  void doSomething() {
    ...
  }

  String giveMeSomeString() {
    return _someService.getSomeString();
  }

  Future<int> giveMeSomeIntSoon() {
    return _someService.getSomeIntSoon();
  }

  @TestDriverDefaultFutureValue(CustomClass())
  Future<CustomClass> giveMeSomeCustomClassSoon() {
  return _someService.getSomeCustomClassSoon();
  }
}

(Optional) Specify global test default values

As an alternative to annotating test default values you can also globally specify what values should be generated for a type inside your build.yaml. This will load your specified values into the table where default values are taken from.

What's important is that you have to specify how they will be constructed, not something like a json version of the class. Note here, how the CustomClass is specified. Make sure though that the drivers for which the class will be generated are aware of all classes used in the constructor, otherwise you'll get a compiler error.

Add the build.yaml on the level of your pubspec.yaml in the following scheme:

targets:
  $default:
    builders:
      widget_driver_generator:
        options:
          defaultTestValues:
            "bool": "true"
            "Color": "Colors.yellow"
            "int": "123"
            "CustomClass": "const CustomClass(\n    name: 'name',\n    description: 'Some desc',\n    imageUrl: 'http://www.exampleImage.com/image',\n  )"
            "String": "'Hello World'"

This can help you in multiple situations. The above example does two things:

1. It overwrites values for already specified built-in and frequently used types (bool, Color, int, String). This is not needed to make the generation work without adding annotations though, it's more a 'nice to have''.
2. It specifies the value for a CustomClass. This one would not have been generated without annotations. By specifying it here, you can omit the annotation for the class in all of your drivers.

Generating the code

So now you have all of your imports, definitions and annotations in place.
Then let's do a one-time build:

dart run build_runner build --delete-conflicting-outputs

Read more about using build_runner on pub.dev.

Intro to WidgetDriver

For more information about the widget_driver framework then please read here