Use WorkManager(s) in AnalysisDriver.

pkg/analyzer/test/src/task/dart_work_manager_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_work_manager_test;
 
 import 'package:analyzer/src/context/cache.dart';
 import 'package:analyzer/src/generated/engine.dart'
     show CacheState, InternalAnalysisContext;
 import 'package:analyzer/src/generated/java_engine.dart' show CaughtException;
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/task/dart.dart';
 import 'package:analyzer/src/task/dart_work_manager.dart';
+import 'package:analyzer/src/task/driver.dart';
 import 'package:analyzer/task/dart.dart';
 import 'package:typed_mock/typed_mock.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../generated/test_support.dart';
 import '../../reflective_tests.dart';
 
 main() {
   groupSep = ' | ';
   runReflectiveTests(DartWorkManagerTest);
@@ skipping 187 matching lines @@
     entry1.setValue(SOURCE_KIND, SourceKind.LIBRARY, []);
     manager.unknownSourceQueue.addAll([source1, source2]);
     TargetedResult request = manager.getNextResult();
     expect(request.target, source2);
     expect(request.result, SOURCE_KIND);
     // source1 is out, source2 is waiting
     expect_librarySourceQueue([]);
     expect_unknownSourceQueue([source2]);
   }
 
+  void test_getNextResultPriority_hasLibrary() {
+    manager.librarySourceQueue.addAll([source1]);
+    expect(manager.getNextResultPriority(), WorkOrderPriority.NORMAL);
+  }
+
+  void test_getNextResultPriority_hasUnknown() {
+    manager.unknownSourceQueue.addAll([source1]);
+    expect(manager.getNextResultPriority(), WorkOrderPriority.NORMAL);
+  }
+
+  void test_getNextResultPriority_nothingToDo() {
+    expect(manager.getNextResultPriority(), WorkOrderPriority.NONE);
+  }
+
   void test_resultsComputed_isLibrary() {
     manager.unknownSourceQueue.addAll([source1, source2, source3]);
     manager.resultsComputed(source2, {SOURCE_KIND: SourceKind.LIBRARY});
     expect_librarySources([source2]);
     expect_partSources([]);
     expect_librarySourceQueue([source2]);
     expect_unknownSourceQueue([source1, source3]);
   }
 
   void test_resultsComputed_isPart() {
@@ skipping 21 matching lines @@
     expect_partSources([]);
     expect_librarySourceQueue([]);
     expect_unknownSourceQueue([source1, source2]);
   }
 }
 
 class _InternalAnalysisContextMock extends TypedMock
     implements InternalAnalysisContext {
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }