Add put/getSourceErrorsInLibrary to IncrementalCache.

pkg/analyzer/test/src/summary/incremental_cache_test.dart

 // Copyright (c) 2016, 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.
 
 import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/summary/incremental_cache.dart';
 import 'package:unittest/unittest.dart';
 
+import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
 import '../abstract_single_unit.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(IncrementalCacheTest);
 }
 
 /**
  * TODO(scheglov) write more tests for invalidation.
@@ skipping 92 matching lines @@
   void test_getLibraryClosureBundles_onlyLibrary() {
     putTestLibrary(r'''
 main() {}
 ''');
     // the cache is empty, no bundles
     List<LibraryBundleWithId> bundles =
         cache.getLibraryClosureBundles(testSource);
     expect(bundles, isNotNull);
   }
 
+  void test_getSourceErrorsInLibrary_library() {
+    verifyNoTestUnitErrors = false;
+    putTestLibrary(r'''
+main() {
+  int unusedVar = 42;
+}
+''');
+    List<AnalysisError> computedErrors = context.computeErrors(testSource);
+    cache.putSourceErrorsInLibrary(testSource, testSource, computedErrors);
+    List<AnalysisError> readErrors =
+        cache.getSourceErrorsInLibrary(testSource, testSource);
+    new GatheringErrorListener()
+      ..addAll(readErrors)
+      ..assertErrors(computedErrors);
+  }
+
+  void test_getSourceErrorsInLibrary_part() {
+    verifyNoTestUnitErrors = false;
+    Source partSource = addSource(
+        '/foo.dart',
+        r'''
+main() {
+  int unusedVar = 42;
+}
+''');
+    putTestLibrary(r'''
+library lib;
+part 'foo.dart';
+''');
+    List<AnalysisError> computedErrors = context.computeErrors(partSource);
+    cache.putSourceErrorsInLibrary(testSource, partSource, computedErrors);
+    List<AnalysisError> readErrors =
+        cache.getSourceErrorsInLibrary(testSource, partSource);
+    new GatheringErrorListener()
+      ..addAll(readErrors)
+      ..assertErrors(computedErrors);
+  }
+
   void test_getSourceKind_library() {
     putTestLibrary(r'''
 main() {}
 ''');
     expect(cache.getSourceKind(testSource), SourceKind.LIBRARY);
   }
 
   void test_getSourceKind_library_usedAsPart() {
     verifyNoTestUnitErrors = false;
     Source fooSource = addSource(
@@ skipping 46 matching lines @@
   @override
   List<int> get(String key) {
     return map[key];
   }
 
   @override
   void put(String key, List<int> bytes) {
     map[key] = bytes;
   }
 }