Flutter: Inline Test Coverage in Android Studio

Question

I\'m developing an open source Android app in Flutter, using Android Studio 3.3.1 (on Window and Ubuntu). The source is available on Github.

The project has a test f

Answer 1

I don't think is supported for Flutter projects yet.

I have all non-UI code in another pure Dart package that I add as dependency to the Flutter project.

For my project this also has the advantage that code that I can share with the browser GUI (Angular Dart) is separated and can't accidentally be polluted with Flutter dependencies that would break the web project.

In this project I can get coverage information in IntellJ when I follow these steps:

You need a "Dart Command Line App" IntelliJ run configuration instead of a "Dart Test", "Flutter" or "Flutter Test" run configuration.

To be able to run tests with a "Dart Command Line App" run configuration you probably need the standalone Dart SDK installed and select it in Preferences > Languages & Frameworks > Dart > Dart SDK path.

To run all tests with coverage instead of individual files you need a file like

test/all.dart

// ignore_for_file: await_only_futures

import 'dart:async';

import 'client/controller/app_controller_test.dart' as i0;
import 'client/controller/authentication_controller_test.dart' as i1;
import 'client/controller/backoffice/backoffice_controller_test.dart' as i2;
import 'client/controller/backoffice/image_reference_controller_test.dart'
    as i3;
...

Future main() async {
  i0.main();
  i1.main();
  i2.main();
...
} 

with an entry for each test file.

I use a Grinder task like below to generate that file automatically

import 'package:path/path.dart' as path;
...
/// Generate a single Dart file that executes all tests.
/// Dart code coverage reporting still requires that.
@Task('generate test/all.dart')
Future prepareCoverage() async {
  final testDir = Directory('test');
  final context = path.Context(style: path.Style.posix);
  final testFiles = testDir
      .listSync(recursive: true, followLinks: false)
      .where((e) =>
          FileSystemEntity.isFileSync(e.path) && e.path.endsWith('_test.dart'))
      .map(
          (tf) => context.normalize(path.relative(tf.path, from: testDir.path)))
      .toList()
        ..sort();
  final content = StringBuffer('''
// ignore_for_file: await_only_futures

import 'dart:async';

''');
  final executions = StringBuffer();
  for (var i = 0; i < testFiles.length; i++) {
    final testFile = testFiles[i];
    content.writeln("import '$testFile' as i$i;");
    executions.writeln('  i$i.main();');
  }
  content
    ..writeln('Future main() async {')
    ..writeln()
    ..writeln(executions)
    ..writeln('}');
  File('test/all.dart').writeAsStringSync(content.toString());
  PubApp.global('dart_style')
      .run(['-w', '--fix']..add('test/all.dart'), script: 'format');
}