feat(#377): list failing tests

lib/src/cli/flutter_cli.dart

@@ -280,11 +280,11 @@ Future<int> _flutterTest({
 
  var successCount = 0;
  var skipCount = 0;
- var failureCount = 0;
+ final failedTests = <String>[];
 
  String computeStats() {
  final passingTests = successCount.formatSuccess();
- final failingTests = failureCount.formatFailure();
+ final failingTests = failedTests.length.formatFailure();
  final skippedTests = skipCount.formatSkipped();
  final result = [passingTests, failingTests, skippedTests]
  ..removeWhere((element) => element.isEmpty);
@@ -347,7 +347,7 @@ Future<int> _flutterTest({
  successCount++;
  } else {
  stderr('$clearLine${test.name} ${suite.path} (FAILED)');
- failureCount++;
+ failedTests.add(test.name);
  }
 
  final timeElapsed = Duration(milliseconds: event.time).formatted();
@@ -366,6 +366,22 @@ Future<int> _flutterTest({
  : lightRed.wrap('Some tests failed.')!;
 
  stdout('$clearLine${darkGray.wrap(timeElapsed)} $stats: $summary\n');
+
+ if (event.success != true) {
+ assert(
+ failedTests.isNotEmpty,
+ 'Invalid state: test event report as faield but no failed tests were gathered',
+ );
+ final title = styleBold.wrap('Failing Tests:');
+ final lines = failedTests.fold<StringBuffer>(
+ StringBuffer('$clearLine$title\n'),
+ (previousValue, testName) {
+ previousValue.writeln('$clearLine - $testName');
+ return previousValue;
+ },
+ );
+ stdout(lines.toString());
+ }
  }
 
  if (event is ExitTestEvent) {