Add mirrors tests

test/codegen/lib/mirrors/mirrors_reader_test.dart

+// Copyright (c) 2014, 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.
+
+// Test that everything reachable from a [MirrorSystem] can be accessed.
+
+library test.mirrors.reader;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+import 'mirrors_reader.dart';
+
+class RuntimeMirrorsReader extends MirrorsReader {
+  final MirrorSystem mirrorSystem;
+  final String mirrorSystemType;
+
+  RuntimeMirrorsReader(MirrorSystem mirrorSystem,
+                      {bool verbose: false, bool includeStackTrace: false})
+      : this.mirrorSystem = mirrorSystem,
+        this.mirrorSystemType = '${mirrorSystem.runtimeType}',
+        super(verbose: verbose, includeStackTrace: includeStackTrace);
+
+  visitLibraryMirror(LibraryMirror mirror) {
+    super.visitLibraryMirror(mirror);
+    Expect.equals(mirror, mirrorSystem.libraries[mirror.uri]);
+  }
+
+  visitClassMirror(ClassMirror mirror) {
+    super.visitClassMirror(mirror);
+    Expect.isNotNull(mirror.owner);
+  }
+
+  bool allowUnsupported(var receiver, String tag, UnsupportedError exception) {
+    if (mirrorSystemType == '_LocalMirrorSystem') {
+      // VM mirror system.
+      if (tag.endsWith('location')) {
+        return receiver is ParameterMirror;
+      }
+    } else if (mirrorSystemType == 'JsMirrorSystem') {
+      // Dart2js runtime mirror system.
+      if (tag.endsWith('.metadata')) {
+        return true;// Issue 10905.
+      }
+    }
+    return false;
+  }
+
+  bool expectUnsupported(var receiver, String tag, UnsupportedError exception) {
+    // [DeclarationMirror.location] is intentionally not supported in runtime
+    // mirrors.
+
+    if (mirrorSystemType == '_LocalMirrorSystem') {
+      // VM mirror system.
+    } else if (mirrorSystemType == 'JsMirrorSystem') {
+      // Dart2js runtime mirror system.
+      if (receiver is DeclarationMirror && tag == 'location') {
+        return true;
+      }
+    }
+    return false;
+  }
+}
+
+void main([List<String> arguments = const <String>[]]) {
+  MirrorSystem mirrors = currentMirrorSystem();
+  MirrorsReader reader = new RuntimeMirrorsReader(mirrors,
+      verbose: arguments.contains('-v'),
+      includeStackTrace: arguments.contains('-s'));
+  reader.checkMirrorSystem(mirrors);
+}