Add a boolean which causes AnalysisServer to rethrow exceptions.

pkg/analysis_server/test/analysis_server_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.
 
 library test.analysis_server;
 
-import 'dart:async';
 
+import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/domain_server.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/resource.dart';
 import 'package:mock/mock.dart';
 import 'package:unittest/unittest.dart';
 
 import 'mocks.dart';
 
 class AnalysisServerTestHelper {
   MockServerChannel channel;
   AnalysisServer server;
-  MockAnalysisLogger logger;
 
-  AnalysisServerTestHelper() {
+  AnalysisServerTestHelper({bool rethrowExceptions: true}) {
     channel = new MockServerChannel();
-    server = new AnalysisServer(channel, PhysicalResourceProvider.INSTANCE);
-    logger = new MockAnalysisLogger();
-    AnalysisEngine.instance.logger = logger;
+    server = new AnalysisServer(channel, PhysicalResourceProvider.INSTANCE,
+        rethrowExceptions: rethrowExceptions);
   }
 }
 
 main() {
   group('AnalysisServer', () {
     test('addContextToWorkQueue_whenNotRunning', () {
       AnalysisServerTestHelper helper = new AnalysisServerTestHelper();
       helper.server.running = false;
       MockAnalysisContext context = new MockAnalysisContext();
       helper.server.addContextToWorkQueue(context);
@@ skipping 108 matching lines @@
     test('unknownRequest', () {
       AnalysisServerTestHelper helper = new AnalysisServerTestHelper();
       helper.server.handlers = [new EchoHandler()];
       var request = new Request('my22', 'randomRequest');
       return helper.channel.sendRequest(request)
           .then((Response response) {
             expect(response.id, equals('my22'));
             expect(response.error, isNotNull);
           });
     });
+
+    test('rethrow exceptions', () {
+      AnalysisServerTestHelper helper = new AnalysisServerTestHelper();
+      MockAnalysisContext context = new MockAnalysisContext();
+      Exception exceptionToThrow = new Exception('test exception');
+      context.when(callsTo('performAnalysisTask')).alwaysThrow(exceptionToThrow);
+      helper.server.addContextToWorkQueue(context);
+      try {
+        helper.server.performTask();
+        fail('exception not rethrown');
+      } on AnalysisException catch (exception) {
+        expect(exception.cause.exception, equals(exceptionToThrow));
+      }
+    });
   });
 }
 
 class EchoHandler implements RequestHandler {
   @override
   Response handleRequest(Request request) {
     if (request.method == 'echo') {
       var response = new Response(request.id);
       response.setResult('echo', true);
       return response;
     }
     return null;
   }
 }