Add test of unittests.

tests/compiler/dart2js/resolver_test.dart

 // Copyright (c) 2012, 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.
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
 import 'package:compiler/src/constants/expressions.dart';
@@ skipping 180 matching lines @@
     }),
 
     MockCompiler.create((MockCompiler compiler) {
       compiler.parseScript('class Foo<T> {'
                            '  Foo<T> t;'
                            '  foo(Foo<T> f) {}'
                            '  bar() { g(Foo<T> f) {}; g(); }'
                            '}');
       ClassElement foo = compiler.mainApp.find('Foo');
       foo.ensureResolved(compiler.resolution);
-      foo.lookupLocalMember('t').computeType(compiler.resolution);
-      foo.lookupLocalMember('foo').computeType(compiler.resolution);
+      MemberElement tMember = foo.lookupLocalMember('t');
+      tMember.computeType(compiler.resolution);
+      MemberElement fooMember = foo.lookupLocalMember('foo');
+      fooMember.computeType(compiler.resolution);
       compiler.resolver.resolve(foo.lookupLocalMember('bar'));
       DiagnosticCollector collector = compiler.diagnosticCollector;
       Expect.equals(0, collector.warnings.length);
       Expect.equals(0, collector.errors.length);
     }),
   ]);
 }
 
 Future testSuperCalls() {
   return MockCompiler.create((MockCompiler compiler) {
@@ skipping 1226 matching lines @@
     }
     main() => A.m();
   ''', functionName: 'm');
   check('''
     class A {
       m() => () => await - 3;
     }
     main() => new A().m();
   ''', className: 'A');
 }