Add a boolean which causes AnalysisServer to rethrow exceptions.

pkg/analysis_server/test/analysis_server_test.dart

Index: pkg/analysis_server/test/analysis_server_test.dart
diff --git a/pkg/analysis_server/test/analysis_server_test.dart b/pkg/analysis_server/test/analysis_server_test.dart
index 98e560166c174ea0418d7c72abad68d683ab33a3..acff6abab3f17064cc20c9161d67f047c5f64dce 100644
--- a/pkg/analysis_server/test/analysis_server_test.dart
+++ b/pkg/analysis_server/test/analysis_server_test.dart
@@ -4,8 +4,8 @@
 
 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';
@@ -22,13 +22,11 @@ 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);
   }
 }
 
@@ -157,6 +155,20 @@ main() {
             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));
+      }
+    });
   });
 }