Create a task in the new task model to compute constant dependencies.

pkg/analyzer/test/src/task/dart_test.dart

 // Copyright (c) 2015, 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.task.dart_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
@@ skipping 15 matching lines @@
   runReflectiveTests(BuildCompilationUnitElementTaskTest);
   runReflectiveTests(BuildDirectiveElementsTaskTest);
   runReflectiveTests(BuildEnumMemberElementsTaskTest);
   runReflectiveTests(BuildSourceClosuresTaskTest);
   runReflectiveTests(BuildExportNamespaceTaskTest);
   runReflectiveTests(BuildFunctionTypeAliasesTaskTest);
   runReflectiveTests(BuildLibraryConstructorsTaskTest);
   runReflectiveTests(BuildLibraryElementTaskTest);
   runReflectiveTests(BuildPublicNamespaceTaskTest);
   runReflectiveTests(BuildTypeProviderTaskTest);
+  runReflectiveTests(ComputeConstantDependenciesTaskTest);
   runReflectiveTests(ContainingLibrariesTaskTest);
   runReflectiveTests(DartErrorsTaskTest);
   runReflectiveTests(GatherUsedImportedElementsTaskTest);
   runReflectiveTests(GatherUsedLocalElementsTaskTest);
   runReflectiveTests(GenerateHintsTaskTest);
   runReflectiveTests(LibraryUnitErrorsTaskTest);
   runReflectiveTests(ParseDartTaskTest);
   runReflectiveTests(ResolveUnitTypeNamesTaskTest);
   runReflectiveTests(ResolveLibraryTypeNamesTaskTest);
   runReflectiveTests(ResolveReferencesTaskTest);
@@ skipping 1134 matching lines @@
     // validate
     TypeProvider typeProvider = outputs[TYPE_PROVIDER];
     expect(typeProvider, isNotNull);
     expect(typeProvider.boolType, isNotNull);
     expect(typeProvider.intType, isNotNull);
     expect(typeProvider.futureType, isNotNull);
   }
 }
 
 @reflectiveTest
+class ComputeConstantDependenciesTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source source = newSource('/test.dart', '''
+const x = y;
+const y = 1;
+''');
+    // First compute the library element for the source.
+    _computeResult(source, LIBRARY_ELEMENT1);
+    LibraryElement libraryElement = outputs[LIBRARY_ELEMENT1];
+    // Find the elements for the constant x and y.

[Brian Wilkerson, 2015/05/07 22:46:59]

"constant" --> "constants"

[Paul Berry, 2015/05/08 00:24:35]

Done.

+    List<PropertyAccessorElement> accessors =
+        libraryElement.definingCompilationUnit.accessors;
+    Element x = accessors.firstWhere((PropertyAccessorElement accessor) =>
+        accessor.isGetter && accessor.name == 'x').variable;
+    Element y = accessors.firstWhere((PropertyAccessorElement accessor) =>
+        accessor.isGetter && accessor.name == 'y').variable;
+    // Now compute the dependencies for x, and check that it is the list [y].
+    _computeResult(x, CONSTANT_DEPENDENCIES);
+    expect(outputs[CONSTANT_DEPENDENCIES], [y]);
+  }
+}
+
+@reflectiveTest
 class ContainingLibrariesTaskTest extends _AbstractDartTaskTest {
   test_buildInputs() {
     Map<String, TaskInput> inputs =
         ContainingLibrariesTask.buildInputs(emptySource);
     expect(inputs, isNotNull);
     expect(inputs, isEmpty);
   }
 
   test_constructor() {
     ContainingLibrariesTask task =
@@ skipping 943 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result];
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }