Fix issue 21379

pkg/analyzer/test/generated/engine_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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.engine_test;
 
 import 'dart:collection';
@@ skipping 2793 matching lines @@
   void test_removeResolution_single() {
     Source source1 = new TestSource();
     DartEntry entry = new DartEntry();
     entry.setValueInLibrary(
         DartEntry.RESOLVED_UNIT,
         source1,
         AstFactory.compilationUnit());
     entry.removeResolution(source1);
   }
 
+  void test_resolvableCompilationUnit_builtUnit() {
+    Source librarySource = new TestSource('/lib.dart');
+    CompilationUnit unit = AstFactory.compilationUnit();
+    CompilationUnitElement element = ElementFactory.compilationUnit('test.dart');
+    unit.element = element;
+    DartEntry entry = new DartEntry();
+    entry.setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
+    entry.setValueInLibrary(DartEntry.BUILT_UNIT, librarySource, unit);
+    entry.invalidateAllResolutionInformation(false);
+    CompilationUnit resolvableUnit = entry.resolvableCompilationUnit;
+    expect(resolvableUnit, isNotNull);
+    expect(resolvableUnit.element, isNull);
+    expect(entry.resolvableCompilationUnit, isNull);
+  }
+
+  void test_resolvableCompilationUnit_none() {
+    DartEntry entry = new DartEntry();
+    expect(entry.resolvableCompilationUnit, isNull);
+  }
+
+  void test_resolvableCompilationUnit_parsed() {
+    CompilationUnit unit = AstFactory.compilationUnit();
+    DartEntry entry = new DartEntry();
+    entry.setValue(DartEntry.PARSED_UNIT, unit);
+    expect(entry.resolvableCompilationUnit, unit);
+    expect(entry.resolvableCompilationUnit, isNull);
+  }
+
+  void test_resolvableCompilationUnit_resolved() {
+    Source librarySource = new TestSource('/lib.dart');
+    CompilationUnit unit = AstFactory.compilationUnit();
+    CompilationUnitElement element = ElementFactory.compilationUnit('test.dart');
+    unit.element = element;
+    DartEntry entry = new DartEntry();
+    entry.setState(DartEntry.PARSED_UNIT, CacheState.FLUSHED);
+    entry.setValueInLibrary(DartEntry.RESOLVED_UNIT, librarySource, unit);
+    entry.invalidateAllResolutionInformation(false);
+    CompilationUnit resolvableUnit = entry.resolvableCompilationUnit;
+    expect(resolvableUnit, isNotNull);
+    expect(resolvableUnit.element, isNull);
+    expect(entry.resolvableCompilationUnit, isNull);
+  }
+
   void test_setState_element() {
     _setState(DartEntry.ELEMENT);
   }
 
   void test_setState_exportedLibraries() {
     _setState(DartEntry.EXPORTED_LIBRARIES);
   }
 
   void test_setState_hints() {
     _setStateInLibrary(DartEntry.HINTS);
@@ skipping 3868 matching lines @@
   }
 }
 
 
 class _UniversalCachePartitionTest_test_setMaxCacheSize implements
     CacheRetentionPolicy {
   @override
   RetentionPriority getAstPriority(Source source, SourceEntry sourceEntry) =>
       RetentionPriority.LOW;
 }