Validate cache consistency asynchronously. Compute modification times of physical files in a separa…

pkg/analyzer/test/src/context/context_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.
 
 library analyzer.test.src.context.context_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 383 matching lines @@
         source,
         r'''
 main() {
   print(12);
 }
 ''');
     _analyzeAll_assertFinished();
     expect(context.getResolvedCompilationUnit2(source, source), unit);
     // remove overlay
     context.setContents(source, null);
-    context.validateCacheConsistency();
     _analyzeAll_assertFinished();
     expect(context.getResolvedCompilationUnit2(source, source), unit);
   }
 
   Future test_applyChanges_removeContainer() {
     SourcesChangedListener listener = new SourcesChangedListener();
     context.onSourcesChanged.listen(listener.onData);
     String libAContents = r'''
 library libA;
 import 'libB.dart';''';
@@ skipping 12 matching lines @@
     expect(sources, hasLength(1));
     expect(sources[0], same(libA));
     return pumpEventQueue().then((_) {
       listener.assertEvent(wereSourcesAdded: true);
       listener.assertEvent(wereSourcesAdded: true);
       listener.assertEvent(wereSourcesRemovedOrDeleted: true);
       listener.assertNoMoreEvents();
     });
   }
 
+  void test_cacheConsistencyValidator_computed() {
+    CacheConsistencyValidator validator = context.cacheConsistencyValidator;
+    // Add sources.
+    MemoryResourceProvider resourceProvider = new MemoryResourceProvider();
+    String path1 = '/test1.dart';
+    String path2 = '/test2.dart';
+    Source source1 = resourceProvider.newFile(path1, '// 1-1').createSource();
+    Source source2 = resourceProvider.newFile(path2, '// 2-1').createSource();
+    context.applyChanges(
+        new ChangeSet()..addedSource(source1)..addedSource(source2));
+    // Same modification times.
+    expect(
+        validator.sourceModificationTimesComputed([source1, source2],
+            [source1.modificationStamp, source2.modificationStamp]),
+        isFalse);
+    // Different modification times.
+    expect(
+        validator.sourceModificationTimesComputed([source1, source2],
+            [source1.modificationStamp + 1, source2.modificationStamp]),
+        isTrue);
+  }
+
+  void test_cacheConsistencyValidator_getSources() {
+    CacheConsistencyValidator validator = context.cacheConsistencyValidator;
+    // Add sources.
+    MemoryResourceProvider resourceProvider = new MemoryResourceProvider();
+    String path1 = '/test1.dart';
+    String path2 = '/test2.dart';
+    Source source1 = resourceProvider.newFile(path1, '// 1-1').createSource();
+    Source source2 = resourceProvider.newFile(path2, '// 2-1').createSource();
+    context.applyChanges(
+        new ChangeSet()..addedSource(source1)..addedSource(source2));
+    // No overlays.
+    expect(validator.getSourcesToComputeModificationTimes(),
+        unorderedEquals([source1, source2]));
+    // Add an overlay.
+    context.setContents(source1, '// 1-2');
+    expect(validator.getSourcesToComputeModificationTimes(),
+        unorderedEquals([source2]));
+    // Remove an overlay.
+    context.setContents(source1, null);
+    expect(validator.getSourcesToComputeModificationTimes(),
+        unorderedEquals([source1, source2]));
+  }
+
   void test_computeDocumentationComment_class_block() {
     String comment = "/** Comment */";
     Source source = addSource(
         "/test.dart",
         """
 $comment
 class A {}""");
     LibraryElement libraryElement = context.computeLibraryElement(source);
     expect(libraryElement, isNotNull);
     ClassElement classElement = libraryElement.definingCompilationUnit.types[0];
@@ skipping 3374 matching lines @@
    * Initialize the visitor.
    */
   _ElementGatherer();
 
   @override
   void visitElement(Element element) {
     elements[element] = element;
     super.visitElement(element);
   }
 }