ci: Enhance test outputs for CI (#3904)

Enhance test outputs for CI

<img width="1082" height="1005" alt="image"
src="https://github.com/user-attachments/assets/f4f9553e-da5f-4cc2-9f38-aef7103e152a"
/>

Author: luanpotter

pubspec.yaml

@@ -156,7 +156,7 @@ melos:
       description: Checks whether there are any broken links in the docs.
 
     test:select:
-      run: melos exec -c 1 -- flutter test
+      run: melos exec -c 1 -- flutter test --reporter=json 2>&1 | dart run "$MELOS_ROOT_PATH/scripts/test_formatter.dart"
       packageFilters:
         dirExists: test
       description: Run `flutter test` for selected packages.

scripts/test_formatter.dart

@@ -0,0 +1,211 @@
+import 'dart:convert';
+import 'dart:io';
+
+void main() {
+  final parser = _OutputParser();
+
+  stdin
+      .transform(utf8.decoder)
+      .transform(const LineSplitter())
+      .listen(
+        parser.processLine,
+        onDone: () {
+          parser.flush();
+          exitCode = parser.success ? 0 : 1;
+        },
+      );
+}
+
+class _OutputParser {
+  final _packages = [_PackageParser()];
+
+  int get failed => _packages.sumBy((package) => package.failed);
+  int get passed => _packages.sumBy((package) => package.passed);
+  bool get success => failed == 0;
+
+  void processLine(String line) {
+    if (!line.startsWith('{')) {
+      _packages.last.processPlainLine(line);
+      return;
+    }
+
+    try {
+      final event = jsonDecode(line) as Map<String, dynamic>;
+
+      if (!_packages.last.processJsonEvent(event)) {
+        _OutputWriter.info(line);
+      }
+
+      if (event['type'] == 'done') {
+        _packages.add(_PackageParser());
+      }
+    } on FormatException {
+      _OutputWriter.info(line);
+      return;
+    }
+  }
+
+  void flush() {
+    _packages.last.flush();
+    _OutputWriter.info('');
+    final logLevel = success ? _LogLevel.success : _LogLevel.failure;
+    _OutputWriter.log(logLevel, 'Total: $passed passed, $failed failed');
+  }
+}
+
+class _PackageParser {
+  static final _dependencyLinePattern = RegExp(
+    r'^\s+\S+ \d+\.\S+.*available\)$',
+  );
+
+  var _suppressedDependencyCount = 0;
+
+  final _activeTests = <int, _TestEntry>{};
+  var passed = 0;
+  var failed = 0;
+
+  void processPlainLine(String line) {
+    if (_dependencyLinePattern.hasMatch(line)) {
+      _suppressedDependencyCount++;
+      return;
+    }
+
+    flush();
+    _OutputWriter.info(line);
+  }
+
+  void flush() {
+    if (_suppressedDependencyCount > 0) {
+      _flushDependencyBlock();
+    }
+  }
+
+  bool processJsonEvent(Map<String, dynamic> event) {
+    final type = event['type'] as String?;
+
+    switch (type) {
+      case 'start':
+      case 'suite':
+      case 'allSuites':
+      case 'group':
+        break;
+
+      case 'testStart':
+        final test = event['test'] as Map<String, dynamic>?;
+        final id = test?['id'] as int?;
+        final name = test?['name'] as String?;
+        if (id == null || name == null) {
+          return false;
+        }
+        _activeTests[id] = (name: name, output: StringBuffer());
+
+      case 'print':
+        final id = event['testID'] as int?;
+        final test = _activeTests[id];
+        if (test == null) {
+          return false;
+        }
+        test.output.writeln(event['message'] ?? '');
+
+      case 'error':
+        final id = event['testID'] as int?;
+        final test = _activeTests[id];
+        if (test == null) {
+          return false;
+        }
+        test.output.writeln(event['error'] ?? '');
+        final stack = event['stackTrace'] as String?;
+        if (stack != null && stack.isNotEmpty) {
+          test.output.writeln(stack);
+        }
+
+      case 'testDone':
+        final id = event['testID'] as int?;
+        if (id == null) {
+          return false;
+        }
+        if (event['hidden'] == true) {
+          _activeTests.remove(id);
+          break;
+        }
+        final test = _activeTests.remove(id);
+        final result = event['result'] as String?;
+        if (result == 'success') {
+          passed++;
+        } else {
+          failed++;
+          _OutputWriter.info('');
+          _OutputWriter.failure('━━━ FAIL: ${test?.name ?? 'unknown test'}');
+          final output = test?.output;
+          if (output != null && output.isNotEmpty) {
+            _OutputWriter.failure(output.toString());
+          } else {
+            _OutputWriter.failure('━━━ No output captured for this test.');
+          }
+        }
+
+      case 'done':
+        final logLevel = failed > 0 ? _LogLevel.failure : _LogLevel.success;
+        _OutputWriter.log(logLevel, '$passed passed, $failed failed');
+
+      default:
+        // unknown - pass through
+        return false;
+    }
+
+    return true;
+  }
+
+  void _flushDependencyBlock() {
+    _OutputWriter.info(
+      '  ($_suppressedDependencyCount packages have newer versions available)',
+    );
+    _suppressedDependencyCount = 0;
+  }
+}
+
+extension _SumBy<T> on List<T> {
+  int sumBy(int Function(T) selector) {
+    return fold(0, (sum, element) => sum + selector(element));
+  }
+}
+
+typedef _TestEntry = ({String name, StringBuffer output});
+
+enum _LogLevel { info, success, failure }
+
+class _OutputWriter {
+  _OutputWriter._();
+
+  static const _ansiRed = '\x1B[31m';
+  static const _ansiGreen = '\x1B[32m';
+  static const _ansiReset = '\x1B[0m';
+
+  static String _colored(String message, String color) {
+    return '$color$message$_ansiReset';
+  }
+
+  static void info(String message) {
+    stdout.writeln(message);
+  }
+
+  static void success(String message) {
+    stdout.writeln(_colored(message, _ansiGreen));
+  }
+
+  static void failure(String message) {
+    stderr.writeln(_colored(message, _ansiRed));
+  }
+
+  static void Function(String) logger(_LogLevel level) {
+    return switch (level) {
+      _LogLevel.info => info,
+      _LogLevel.success => success,
+      _LogLevel.failure => failure,
+    };
+  }
+
+  static void log(_LogLevel level, String message) {
+    logger(level)(message);
+  }
+}