Use mirrors and annotations to find test methods.

pkg/analysis_server/test/declarative_tests.dart

+library declarative_tests;
+
+import 'dart:mirrors';
+
+import 'package:unittest/unittest.dart' show group, test;
+
+/// Use [runTest] annotation to indicate that method is a test method.
+/// Alternatively method name can have the `test` prefix.
+const runTest = const _RunTest();
+
+class _RunTest {
+  const _RunTest();
+}
+
+/// Creates a new named group of tests with the name of the given [Type], then
+/// adds new tests using [addTestMethods].
+addTestSuite(Type type) {
+  group(type.toString(), () {
+    addTestMethods(type);
+  });
+}
+
+/// Creates a new test case for the each static method with the name starting
+/// with `test` or having the [runTest] annotation.
+addTestMethods(Type type) {
+  var typeMirror = reflectClass(type);
+  typeMirror.staticMembers.forEach((methodSymbol, method) {
+    if (_isTestMethod(method)) {
+      var methodName = MirrorSystem.getName(methodSymbol);
+      test(methodName, () {
+        typeMirror.invoke(methodSymbol, []);
+      });
+    }
+  });
+}
+
+bool _isTestMethod(MethodMirror method) {
+  if (method.parameters.isNotEmpty) {
+    return false;
+  }
+  var methodSymbol = method.simpleName;
+  // name starts with "test"
+  var methodName = MirrorSystem.getName(methodSymbol);
+  if (methodName.startsWith('test')) {
+    return true;
+  }
+  // has @testMethod
+  return method.metadata.any((annotation) {
+    return identical(annotation.reflectee, runTest);
+  });
+}