Ignore non-existent analysis roots.

pkg/analysis_server/test/domain_analysis_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.domain.analysis;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
@@ skipping 77 matching lines @@
           resourceProvider.newFile(file, 'main() {}');
           var response = testSetAnalysisRoots(['/project'], []);
           var serverRef = server;
           expect(response, isResponseSuccess('0'));
           // verify that unit is resolved eventually
           return server.onAnalysisComplete.then((_) {
             var units = serverRef.getResolvedCompilationUnits(file);
             expect(units, hasLength(1));
           });
         });
+
+        test('nonexistent folder', () async {
+          String fileB = '/project_b/b.dart';
+          resourceProvider.newFile(fileB, '// b');
+          var response = testSetAnalysisRoots(['/project_a', '/project_b'], []);
+          var serverRef = server;
+          expect(response, isResponseSuccess('0'));
+          // Non-existence of /project_a should not prevent files in /project_b
+          // from being analyzed.
+          await server.onAnalysisComplete;
+          expect(serverRef.getResolvedCompilationUnits(fileB), hasLength(1));
+        });
       });
     });
 
     group('setPriorityFiles', () {
       test('invalid', () {
         // TODO(paulberry): under the "eventual consistency" model this request
         // should not be invalid.
         var request = new AnalysisSetPriorityFilesParams(['/project/lib.dart'])
             .toRequest('0');
         var response = handler.handleRequest(request);
@@ skipping 615 matching lines @@
   test_beforeAnalysis() async {
     addTestFile('int V = 42;');
     createProject();
     // subscribe
     addAnalysisSubscription(AnalysisService.HIGHLIGHTS, testFile);
     // wait for analysis
     await waitForTasksFinished();
     expect(filesHighlights[testFile], isNotEmpty);
   }
 }