Port and test more assists.

pkg/analysis_testing/lib/mock_sdk.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.
 
 library testing.mock_sdk;
 
 import 'package:analyzer/file_system/file_system.dart' as resource;
 import 'package:analyzer/file_system/memory_file_system.dart' as resource;
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
 
 
 class MockSdk implements DartSdk {
   final resource.MemoryResourceProvider provider =
       new resource.MemoryResourceProvider();
 
   static const _MockSdkLibrary LIB_CORE =
       const _MockSdkLibrary('dart:core', '/lib/core/core.dart', '''
 library dart.core;
-class Object {}
+
+class Object {
+  bool operator ==(other) => identical(this, other);
+}
+
 class Function {}
 class StackTrace {}
 class Symbol {}
 class Type {}
 
 abstract class Comparable<T> {
   int compareTo(T other);
 }
 
 class String implements Comparable<String> {
@@ skipping 41 matching lines @@
 }
 
 class Stream<T> {}
 ''');
 
   static const _MockSdkLibrary LIB_MATH =
       const _MockSdkLibrary('dart:math', '/lib/math/math.dart', '''
 library dart.math;
 const double E = 2.718281828459045;
 const double PI = 3.1415926535897932;
+num min(num a, num b) => 0;
+num max(num a, num b) => 0;
 ''');
 
   static const _MockSdkLibrary LIB_HTML =
       const _MockSdkLibrary('dart:html', '/lib/html/dartium/html_dartium.dart', '''
 library dart.html;
 class HtmlElement {}
 ''');
 
   static const List<SdkLibrary> LIBRARIES = const [
       LIB_CORE,
@@ skipping 87 matching lines @@
   bool get isInternal => throw unimplemented;
 
   @override
   bool get isShared => throw unimplemented;
 
   @override
   bool get isVmLibrary => throw unimplemented;
 
   UnimplementedError get unimplemented => new UnimplementedError();
 }