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<void> 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<void> 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<void> 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');
}
