SDK mocking for improved test throughput.

test/rule_test.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 linter.test.rule;
 
 import 'dart:io';
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 335 matching lines @@
     int lineNumber = 1;
     for (var line in file.readAsLinesSync()) {
       var annotation = extractAnnotation(line);
       if (annotation != null) {
         annotation.lineNumber = lineNumber;
         expected.add(new AnnotationMatcher(annotation));
       }
       ++lineNumber;
     }
 
-    DartLinter driver = new DartLinter.forRules(
-        [ruleRegistry[ruleName]].where((rule) => rule != null));
+    LinterOptions options = new LinterOptions(
+        [ruleRegistry[ruleName]].where((rule) => rule != null))
+      ..useMockSdk = true
+      ..packageRootPath = '.';
+
+    DartLinter driver = new DartLinter(options);
 
     Iterable<AnalysisErrorInfo> lints = driver.lintFiles([file]);
 
     List<Annotation> actual = [];
     lints.forEach((AnalysisErrorInfo info) {
       info.errors.forEach((AnalysisError error) {
         if (error.errorCode.type == ErrorType.LINT) {
           actual.add(new Annotation.forError(error, info.lineInfo));
         }
       });
     });
     try {
       expect(actual, unorderedMatches(expected));
     } on Error catch (e) {
-
       if (debug) {
         // Dump results for debugging purposes.
 
         //AST.
         new Spelunker(file.absolute.path).spelunk();
         print('');
         // Lints.
         var reporter = new ResultReporter(lints);
         reporter.write();
       }
@@ skipping 65 matching lines @@
 
 class NoFilter implements LintFilter {
   @override
   bool filter(AnalysisError lint) => false;
 }
 
 class ResultReporter extends DetailedReporter {
   ResultReporter(Iterable<AnalysisErrorInfo> errors)
       : super(errors, new NoFilter(), stdout);
 }