A local file-based Index implementation.

pkg/analysis_server/test/index/index_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 test.index;
+
+import 'dart:async';
+import 'dart:io' show Directory;
+
+import 'package:analysis_server/src/index/index.dart';
+import 'package:analysis_server/src/resource.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/html.dart';
+import 'package:analyzer/src/generated/index.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+import 'package:analyzer/src/generated/source_io.dart';
+import 'package:unittest/unittest.dart';
+
+import '../mocks.dart';
+import '../reflective_tests.dart';
+import 'store/single_source_container.dart';
+
+
+main() {
+  groupSep = ' | ';
+  group('ServerIndex', () {
+    runReflectiveTests(_LocalSplitIndexTest);
+  });
+}
+
+
+void _assertElementNames(List<Location> locations, List expected) {
+  expect(_toElementNames(locations), unorderedEquals(expected));
+}
+
+
+Iterable<String> _toElementNames(List<Location> locations) {
+  return locations.map((loc) => loc.element.name);
+}
+
+
+@ReflectiveTestCase()
+class _LocalSplitIndexTest {
+  static final DartSdk SDK = new MockSdk();
+
+  AnalysisContext context;
+  LocalSplitIndex index;
+  Directory indexDirectory;
+  MemoryResourceProvider provider = new MemoryResourceProvider();

[Paul Berry, 2014/06/24 15:49:59]

This should be initialized in setUp().

[scheglov, 2014/06/24 18:07:46]

Why?
It does not reference any other field, so can be initialized in declaration.

+
+  void setUp() {
+    // prepare Index
+    indexDirectory = Directory.systemTemp.createTempSync(
+        'AnalysisServer_index');
+    index = new LocalSplitIndex(indexDirectory);
+    // prepare AnalysisContext
+    context = AnalysisEngine.instance.createAnalysisContext();
+    context.sourceFactory = new SourceFactory(<UriResolver>[new DartUriResolver(
+        SDK), new ResourceUriResolver(provider)]);
+  }
+
+  void tearDown() {
+    indexDirectory.delete(recursive: true);
+    index = null;
+    context = null;
+    provider = null;
+  }
+
+  test_clear() {

[Paul Berry, 2014/06/24 15:49:59]

Since it is a common mistake to forget to return newly created futures
(especially in tests), I think it would be really helpful to annotate the return
types of all our tests (i.e. make this "Future test_clear() {")

A similar comment applies to test_indexUnit(), test_removeContext(),
test_removeSource(), and test_removeSources().

[scheglov, 2014/06/24 18:07:46]

I'm not 100% sure that declaring Future explicitly will help.
If we forget to return the created Future, we will forget to declare that
methods returns it too :-)

But I think it is reasonable to have an explicit return type instead of dynamic,
so done.

+    _indexTest('main() {}');
+    return _getDefinedFunctions().then((locations) {
+      _assertElementNames(locations, ['main']);
+      // clear
+      index.clear();
+      return _getDefinedFunctions().then((locations) {
+        expect(locations, isEmpty);
+      });
+    });
+  }
+
+  void test_getRelationships() {
+    var callback = new _RecordingRelationshipCallback();
+    Element element = UniverseElement.INSTANCE;
+    index.getRelationships(element, IndexConstants.DEFINES_CLASS, callback);
+    expect(callback.locations, isEmpty);
+  }

[Paul Berry, 2014/06/24 15:49:59]

We should also test that getRelationships() passes the correct set of
relationships to the callback when the set of relationships is non-empty.

[scheglov, 2014/06/24 18:07:46]

Actually we cannot.
getRelationships() implements Index API, but does nothing.
We cannot (or at least I don't know how) to convert async SplitIndexStore API we
use into synchronous one.

+
+  test_indexHtmlUnit_nullUnit() {

[Paul Berry, 2014/06/24 15:49:59]

Similarly, I'd prefer to see this function's return type annotated as void. 
Same goes for test_indexHtmlUnit_nullUnitElement(), test_indexUnit_nullUnit(),
and test_indexUnit_nullUnitElement().

[scheglov, 2014/06/24 18:07:46]

Done, thank you for catching this.

+    index.indexHtmlUnit(context, null);
+  }
+
+  test_indexHtmlUnit_nullUnitElement() {
+    HtmlUnit unit = new HtmlUnit(null, [], null);
+    index.indexHtmlUnit(context, unit);
+  }
+
+  test_indexUnit() {
+    _indexTest('main() {}');
+    return _getDefinedFunctions().then((locations) {
+      _assertElementNames(locations, ['main']);
+    });
+  }
+
+  test_indexUnit_nullUnit() {
+    index.indexUnit(context, null);
+  }
+
+  test_indexUnit_nullUnitElement() {
+    CompilationUnit unit = new CompilationUnit(null, null, [], [], null);
+    index.indexUnit(context, unit);
+  }
+
+  test_removeContext() {
+    _indexTest('main() {}');
+    return _getDefinedFunctions().then((locations) {
+      // OK, there is a location
+      _assertElementNames(locations, ['main']);
+      // remove context
+      index.removeContext(context);
+      return _getDefinedFunctions().then((locations) {
+        expect(locations, isEmpty);
+      });
+    });
+  }
+
+  test_removeSource() {
+    Source sourceA = _indexLibraryUnit('/testA.dart', 'fa() {}');
+    _indexLibraryUnit('/testB.dart', 'fb() {}');
+    return _getDefinedFunctions().then((locations) {
+      // OK, there are 2 functions
+      _assertElementNames(locations, ['fa', 'fb']);
+      // remove source
+      index.removeSource(context, sourceA);
+      return _getDefinedFunctions().then((locations) {
+        _assertElementNames(locations, ['fb']);
+      });
+    });
+  }
+
+  test_removeSources() {
+    Source sourceA = _indexLibraryUnit('/testA.dart', 'fa() {}');
+    _indexLibraryUnit('/testB.dart', 'fb() {}');
+    return _getDefinedFunctions().then((locations) {
+      // OK, there are 2 functions
+      _assertElementNames(locations, ['fa', 'fb']);
+      // remove source(s)
+      index.removeSources(context, new SingleSourceContainer(sourceA));
+      return _getDefinedFunctions().then((locations) {
+        _assertElementNames(locations, ['fb']);
+      });
+    });
+  }
+
+  void test_statistics() {
+    expect(index.statistics, '[0 locations, 0 sources, 0 names]');
+  }
+
+  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;
+  }
+
+  Future<List<Location>> _getDefinedFunctions() {
+    return index.getRelationshipsAsync(UniverseElement.INSTANCE,
+        IndexConstants.DEFINES_FUNCTION);
+  }
+
+  Source _indexLibraryUnit(String path, String content) {
+    Source source = _addSource(path, content);
+    CompilationUnit dartUnit = _resolveLibraryUnit(source);
+    index.indexUnit(context, dartUnit);
+    return source;
+  }
+
+  void _indexTest(String content) {
+    _indexLibraryUnit('/test.dart', content);
+  }
+
+  CompilationUnit _resolveLibraryUnit(Source source) {
+    return context.resolveCompilationUnit2(source, source);
+  }
+}
+
+
+/**
+ * A [RelationshipCallback] that remembers [Location]s.
+ */
+class _RecordingRelationshipCallback extends RelationshipCallback {
+  List<Location> locations;
+
+  @override
+  void hasRelationships(Element element, Relationship relationship,
+      List<Location> locations) {
+    this.locations = locations;
+  }
+}