Add AnalysisContext.onResultComputed().

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 test.src.context.context_test;
 
 import 'dart:async';
 
 import 'package:analyzer/src/cancelable_future.dart';
 import 'package:analyzer/src/context/cache.dart';
@@ skipping 765 matching lines @@
     // remove libB.dart content and analyze
     context.setContents(libBSource, null);
     _analyzeAll_assertFinished();
     expect(context.getResolvedHtmlUnit(htmlSource), isNotNull,
         reason: "htmlUnit resolved 1");
     AnalysisErrorInfo errors = context.getErrors(htmlSource);
     expect(_hasAnalysisErrorWithErrorSeverity(errors), isTrue,
         reason: "htmlSource has an error");
   }
 
+  void test_performAnalysisTask_onResultComputed() {
+    Set<String> libraryElementUris = new Set<String>();
+    Set<String> parsedUnitUris = new Set<String>();
+    Set<String> resolvedUnitUris = new Set<String>();
+    // listen
+    context.onResultComputed(LIBRARY_ELEMENT).listen((event) {
+      Source librarySource = event.target;
+      libraryElementUris.add(librarySource.uri.toString());
+    });
+    context.onResultComputed(PARSED_UNIT).listen((event) {
+      Source source = event.target;
+      parsedUnitUris.add(source.uri.toString());
+    });
+    context.onResultComputed(RESOLVED_UNIT).listen((event) {
+      LibrarySpecificUnit target = event.target;
+      Source librarySource = target.library;
+      resolvedUnitUris.add(librarySource.uri.toString());
+    });
+    // analyze
+    addSource('/test.dart', 'main() {}');
+    _analyzeAll_assertFinished();
+    // verify
+    expect(libraryElementUris, contains('dart:core'));
+    expect(libraryElementUris, contains('file:///test.dart'));
+    expect(parsedUnitUris, contains('dart:core'));
+    expect(parsedUnitUris, contains('file:///test.dart'));
+    // TODO(scheglov) uncomment after computing all RESOLVED_UNIT(s)
+//    expect(resolvedUnitUris, contains('dart:core'));
+    expect(resolvedUnitUris, contains('file:///test.dart'));
+  }
+
   void fail_performAnalysisTask_IOException() {
     TestSource source = _addSourceWithException2("/test.dart", "library test;");
     int oldTimestamp = context.getModificationStamp(source);
     source.generateExceptionOnRead = false;
     _analyzeAll_assertFinished();
     expect(source.readCount, 1);
     source.generateExceptionOnRead = true;
     do {
       _changeSource(source, "");
       // Ensure that the timestamp differs,
@@ skipping 1345 matching lines @@
       : super(name, pathos.toUri(name), UriKind.FILE_URI);
 
   @override
   TimestampedData<String> get contents {
     throw 'Read error';
   }
 
   @override
   bool exists() => true;
 }