Extract testing utilities into a separate package.

pkg/analysis_server/test/abstract_context.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 test.index;
-
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/file_system/memory_file_system.dart';
-import 'package:analyzer/src/generated/ast.dart';
-import 'package:analyzer/src/generated/element.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/sdk.dart';
-import 'package:analyzer/src/generated/source_io.dart';
-
-import 'mocks.dart';
-import 'reflective_tests.dart';
-
-
-/**
- * Finds an [engine.Element] with the given [name].
- */
-Element findElementInUnit(CompilationUnit unit, String name, [ElementKind kind])
-    {
-  Element result = null;
-  unit.element.accept(new _ElementVisitorFunctionWrapper((Element element) {
-    if (element.name != name) {
-      return;
-    }
-    if (kind != null && element.kind != kind) {
-      return;
-    }
-    result = element;
-  }));
-  return result;
-}
-
-
-/**
- * A function to be called for every [Element].
- */
-typedef void _ElementVisitorFunction(Element element);
-
-
-@ReflectiveTestCase()
-class AbstractContextTest {
-  static final DartSdk SDK = new MockSdk();
-
-  AnalysisContext context;
-  MemoryResourceProvider provider = new MemoryResourceProvider();
-
-  Source addSource(String path, String content) {
-    File file = provider.newFile(path, content);
-    Source source = file.createSource(UriKind.FILE_URI);
-    ChangeSet changeSet = new ChangeSet();
-    changeSet.addedSource(source);
-    context.applyChanges(changeSet);
-    context.setContents(source, content);
-    return source;
-  }
-
-  CompilationUnit resolveLibraryUnit(Source source) {
-    return context.resolveCompilationUnit2(source, source);
-  }
-
-  void setUp() {
-    context = AnalysisEngine.instance.createAnalysisContext();
-    context.sourceFactory = new SourceFactory(<UriResolver>[new DartUriResolver(
-        SDK), new ResourceUriResolver(provider)]);
-  }
-
-  void tearDown() {
-    context = null;
-    provider = null;
-  }
-}
-
-
-/**
- * Wraps the given [_ElementVisitorFunction] into an instance of
- * [engine.GeneralizingElementVisitor].
- */
-class _ElementVisitorFunctionWrapper extends GeneralizingElementVisitor {
-  final _ElementVisitorFunction function;
-  _ElementVisitorFunctionWrapper(this.function);
-  visitElement(Element element) {
-    function(element);
-    super.visitElement(element);
-  }
-}