Reanalyze after creating a referenced part.

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 455 matching lines @@
     expect(importNode.uriContent, isNotNull);
     expect(importNode.source, libSource);
   }
 
   void test_performAnalysisTask_addPart() {
     Source libSource = addSource("/lib.dart", r'''
 library lib;
 part 'part.dart';''');
     // run all tasks without part
     _analyzeAll_assertFinished();
+    expect(_hasAnalysisErrorWithErrorSeverity(context.getErrors(libSource)),
+        isTrue, reason: "lib has errors");
     // add part and run all tasks
     Source partSource = addSource("/part.dart", r'''
 part of lib;
 ''');
     _analyzeAll_assertFinished();
     // "libSource" should be here
     List<Source> librariesWithPart = context.getLibrariesContaining(partSource);
     expect(librariesWithPart, unorderedEquals([libSource]));
+    expect(_hasAnalysisErrorWithErrorSeverity(context.getErrors(libSource)),
+        isFalse, reason: "lib doesn't have errors");
+    expect(
+        context.getResolvedCompilationUnit2(partSource, libSource), isNotNull,
+        reason: "part resolved");
   }
 
   void test_performAnalysisTask_changeLibraryContents() {
     Source libSource =
         addSource("/test.dart", "library lib; part 'test-part.dart';");
     Source partSource = addSource("/test-part.dart", "part of lib;");
     _analyzeAll_assertFinished();
     expect(context.getResolvedCompilationUnit2(libSource, libSource), isNotNull,
         reason: "library resolved 1");
     expect(
@@ skipping 1640 matching lines @@
       : super(name, pathos.toUri(name), UriKind.FILE_URI);
 
   @override
   TimestampedData<String> get contents {
     throw 'Read error';
   }
 
   @override
   bool exists() => true;
 }