Test for computing task inputs before performing task itself.

pkg/analyzer/test/src/task/driver_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.driver_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/cancelable_future.dart';
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/constant.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/html.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/driver.dart';
+import 'package:analyzer/src/task/inputs.dart';
 import 'package:analyzer/src/task/manager.dart';
 import 'package:analyzer/task/model.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../generated/resolver_test.dart';
 import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
 import 'test_support.dart';
 
 main() {
@@ skipping 184 matching lines @@
     task = new TestAnalysisTask(context, target, descriptor: descriptor);
     manager.addTaskDescriptor(descriptor);
     manager.addGeneralResult(result);
     context.priorityTargets.add(target);
 
     expect(driver.performAnalysisTask(), true);
     expect(driver.performAnalysisTask(), true);
     expect(driver.performAnalysisTask(), false);
   }
 
+  test_performAnalysisTask_inputsFirst() {
+    AnalysisTarget target = new TestSource();
+    ResultDescriptor resultA = new ResultDescriptor('resultA', -1);
+    ResultDescriptor resultB = new ResultDescriptor('resultB', -2);
+    // configure tasks
+    TestAnalysisTask task1;
+    TestAnalysisTask task2;
+    TaskDescriptor descriptor1 = new TaskDescriptor(
+        'task1', (context, target) => task1, (target) => {}, [resultA]);
+    TaskDescriptor descriptor2 = new TaskDescriptor('task2',
+        (context, target) => task2,
+        (target) => {'inputA': new SimpleTaskInput<int>(target, resultA)}, [
+      resultB
+    ]);
+    task1 = new TestAnalysisTask(context, target,
+        descriptor: descriptor1, results: [resultA], value: 10);
+    task2 = new TestAnalysisTask(context, target,
+        descriptor: descriptor2, value: 20);
+    manager.addTaskDescriptor(descriptor1);
+    manager.addTaskDescriptor(descriptor2);
+    context.explicitTargets.add(target);
+    manager.addGeneralResult(resultB);
+    // prepare work order
+    expect(driver.performAnalysisTask(), true);
+    expect(context.getCacheEntry(target).getValue(resultA), -1);
+    expect(context.getCacheEntry(target).getValue(resultB), -2);
+    // compute resultA
+    expect(driver.performAnalysisTask(), true);
+    expect(context.getCacheEntry(target).getValue(resultA), 10);
+    expect(context.getCacheEntry(target).getValue(resultB), -2);
+    // compute resultB
+    expect(driver.performAnalysisTask(), true);
+    expect(context.getCacheEntry(target).getValue(resultA), 10);
+    expect(context.getCacheEntry(target).getValue(resultB), 20);
+    // done
+    expect(driver.performAnalysisTask(), false);
+  }
+
   test_performWorkItem_exceptionInTask() {
     AnalysisTarget target = new TestSource();
     ResultDescriptor result = new ResultDescriptor('result', null);
     CaughtException exception =
         new CaughtException(new AnalysisException(), null);
     TestAnalysisTask task;
     TaskDescriptor descriptor = new TaskDescriptor(
         'task', (context, target) => task, (target) => {}, [result]);
     task = new TestAnalysisTask(context, target,
         descriptor: descriptor, exception: exception);
@@ skipping 194 matching lines @@
     expect(order.pendingItems, hasLength(1));
     expect(order.taskManager, manager);
   }
 
   test_moveNext() {
     TaskManager manager = new TaskManager();
     TaskDescriptor descriptor = new TaskDescriptor(
         'task', null, (_) => {}, [new ResultDescriptor('result', null)]);
     WorkItem workItem = new WorkItem(null, null, descriptor);
     WorkOrder order = new WorkOrder(manager, workItem);
-    expect(order.moveNext(), true);
+    // "item" has no child items
+    expect(order.moveNext(), isTrue);
     expect(order.current, workItem);
+    // done
+    expect(order.moveNext(), isFalse);
+    expect(order.current, isNull);
   }
 }
 
 class _TestContext implements ExtendedAnalysisContext {
   InternalAnalysisContext baseContext =
       AnalysisContextFactory.contextWithCore();
 
   @override
   List<AnalysisTarget> explicitTargets = <AnalysisTarget>[];
 
@@ skipping 329 matching lines @@
   void setContents(Source source, String contents) {
     baseContext.setContents(source, contents);
   }
 
   @override
   void visitCacheItems(void callback(Source source, SourceEntry dartEntry,
       DataDescriptor rowDesc, CacheState state)) {
     baseContext.visitCacheItems(callback);
   }
 }