Update with implementation from 'analyzer'.

lib/test_reflective_loader.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test_reflective_loader;
 
+import 'dart:async';
 @MirrorsUsed(metaTargets: 'ReflectiveTest')
 import 'dart:mirrors';
-import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
 /**
- * Define tests using methods existing in the given [type].
+ * A marker annotation used to annotate overridden test methods (so we cannot
+ * rename them to `fail_`) which are expected to fail at `assert` in the
+ * checked mode.
+ */
+const _AssertFailingTest assertFailingTest = const _AssertFailingTest();
+
+/**
+ * A marker annotation used to annotate overridden test methods (so we cannot
+ * rename them to `fail_`) which are expected to fail.
+ */
+const _FailingTest failingTest = const _FailingTest();
+
+/**
+ * A marker annotation used to instruct dart2js to keep reflection information
+ * for the annotated classes.
+ */
+const ReflectiveTest reflectiveTest = const ReflectiveTest();
+
+/**
+ * Test classes annotated with this annotation are run using [solo_group].
+ */
+const _SoloTest soloTest = const _SoloTest();
+
+/**
+ * Is `true` the application is running in the checked mode.
+ */
+final bool _isCheckedMode = () {
+  try {
+    assert(false);
+    return false;
+  } catch (_) {
+    return true;
+  }
+}();
+
+/**
+ * Runs test methods existing in the given [type].
  *
  * Methods with names starting with `test` are run using [test] function.
  * Methods with names starting with `solo_test` are run using [solo_test] function.
  *
  * Each method is run with a new instance of [type].
  * So, [type] should have a default constructor.
  *
  * If [type] declares method `setUp`, it methods will be invoked before any test
  * method invocation.
  *
  * If [type] declares method `tearDown`, it will be invoked after any test
- * method invocation. If method returns [Future] to test some asyncronous
+ * method invocation. If method returns [Future] to test some asynchronous
  * behavior, then `tearDown` will be invoked in `Future.complete`.
  */
 void defineReflectiveTests(Type type) {
   ClassMirror classMirror = reflectClass(type);
   if (!classMirror.metadata.any((InstanceMirror annotation) =>
-      annotation.type.reflectedType == ReflectiveTest)) {
+  annotation.type.reflectedType == ReflectiveTest)) {
     String name = MirrorSystem.getName(classMirror.qualifiedName);
     throw new Exception('Class $name must have annotation "@reflectiveTest" '
         'in order to be run by runReflectiveTests.');
   }
-  String className = MirrorSystem.getName(classMirror.simpleName);
-  group(className, () {
-    classMirror.instanceMembers.forEach((symbol, memberMirror) {
+  void runMembers() {
+    classMirror.instanceMembers
+        .forEach((Symbol symbol, MethodMirror memberMirror) {
       // we need only methods
       if (memberMirror is! MethodMirror || !memberMirror.isRegularMethod) {
         return;
       }
       String memberName = MirrorSystem.getName(symbol);
       // test_
       if (memberName.startsWith('test_')) {
         test(memberName, () {
-          return _runTest(classMirror, symbol);
+          if (_hasFailingTestAnnotation(memberMirror) ||
+              _isCheckedMode && _hasAssertFailingTestAnnotation(memberMirror)) {
+            return _runFailingTest(classMirror, symbol);
+          } else {
+            return _runTest(classMirror, symbol);
+          }
         });
         return;
       }
       // solo_test_
       if (memberName.startsWith('solo_test_')) {
         solo_test(memberName, () {
           return _runTest(classMirror, symbol);
         });
       }
       // fail_test_
       if (memberName.startsWith('fail_')) {
         test(memberName, () {
           return _runFailingTest(classMirror, symbol);
         });
       }
       // solo_fail_test_
       if (memberName.startsWith('solo_fail_')) {
         solo_test(memberName, () {
           return _runFailingTest(classMirror, symbol);
         });
       }
     });
-  });
+  }
+  String className = MirrorSystem.getName(classMirror.simpleName);
+  if (_hasAnnotationInstance(classMirror, soloTest)) {
+    solo_group(className, runMembers);
+  } else {
+    group(className, runMembers);
+  }
 }
 
+bool _hasAnnotationInstance(DeclarationMirror declaration, instance) =>
+    declaration.metadata.any((InstanceMirror annotation) =>
+        identical(annotation.reflectee, instance));
+
+bool _hasAssertFailingTestAnnotation(MethodMirror method) =>
+    _hasAnnotationInstance(method, assertFailingTest);
+
+bool _hasFailingTestAnnotation(MethodMirror method) =>
+    _hasAnnotationInstance(method, failingTest);
+
 Future _invokeSymbolIfExists(InstanceMirror instanceMirror, Symbol symbol) {
   var invocationResult = null;
+  InstanceMirror closure;
   try {
-    invocationResult = instanceMirror.invoke(symbol, []).reflectee;
+    closure = instanceMirror.getField(symbol);
   } on NoSuchMethodError {}
-  if (invocationResult is Future) {
-    return invocationResult;
-  } else {
-    return new Future.value(invocationResult);
+
+  if (closure is ClosureMirror) {
+    invocationResult = closure.apply([]).reflectee;
   }
+  return new Future.value(invocationResult);
 }
 
 /**
  * Run a test that is expected to fail, and confirm that it fails.
  *
  * This properly handles the following cases:
  * - The test fails by throwing an exception
  * - The test returns a future which completes with an error.
  *
  * However, it does not handle the case where the test creates an asynchronous
@@ skipping 14 matching lines @@
 
 /**
  * A marker annotation used to instruct dart2js to keep reflection information
  * for the annotated classes.
  */
 class ReflectiveTest {
   const ReflectiveTest();
 }
 
 /**
- * A marker annotation used to instruct dart2js to keep reflection information
- * for the annotated classes.
+ * A marker annotation used to annotate overridden test methods (so we cannot
+ * rename them to `fail_`) which are expected to fail at `assert` in the
+ * checked mode.
  */
-const ReflectiveTest reflectiveTest = const ReflectiveTest();
+class _AssertFailingTest {
+  const _AssertFailingTest();
+}
+
+/**
+ * A marker annotation used to annotate overridden test methods (so we cannot
+ * rename them to `fail_`) which are expected to fail.
+ */
+class _FailingTest {
+  const _FailingTest();
+}
+
+/**
+ * A marker annotation used to annotate a test class to run it using
+ * [solo_group].
+ */
+class _SoloTest {
+  const _SoloTest();
+}