Fix error handling in analysis.getError.

pkg/analysis_server/test/integration/integration_test_methods.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.
 //
 // This file has been automatically generated.  Please do not edit it manually.
 // To regenerate the file, use the script
 // "pkg/analysis_server/spec/generate_files".
 
 /**
  * Convenience methods for running integration tests
@@ skipping 154 matching lines @@
    * request will be delayed until they have been computed. If some or all of
    * the errors for the file cannot be computed, then the subset of the errors
    * that can be computed will be returned and the response will contain an
    * error to indicate why the errors could not be computed.
    *
    * This request is intended to be used by clients that cannot asynchronously
    * apply updated error information. Clients that can apply error information
    * as it becomes available should use the information provided by the
    * 'analysis.errors' notification.
    *
+   * If a request is made for a file which does not exist, or which is not
+   * currently subject to analysis (e.g. because it is not associated with any
+   * analysis root specified to analysis.setAnalysisRoots), an error of type
+   * GET_ERRORS_INVALID_FILE will be generated.
+   *
    * Parameters
    *
    * file ( FilePath )
    *
    *   The file for which errors are being requested.
    *
    * Returns
    *
    * errors ( List<AnalysisError> )
    *
@@ skipping 1273 matching lines @@
       case "debug.launchData":
         expect(params, isDebugLaunchDataParams);
         _onDebugLaunchData.add(params);
         break;
       default:
         fail('Unexpected notification: $event');
         break;
     }
   }
 }