pkg/docgen: basic test of json output

pkg/docgen/lib/docgen.dart

 // Copyright (c) 2013, 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.
 
 /// **docgen** is a tool for creating machine readable representations of Dart
 /// code metadata, including: classes, members, comments and annotations.
 ///
 /// docgen is run on a `.dart` file or a directory containing `.dart` files.
 ///
 ///      $ dart docgen.dart [OPTIONS] [FILE/DIR]
@@ skipping 95 matching lines @@
 /// also be documented.
 /// If [parseSdk] is `true`, then all Dart SDK libraries will be documented.
 /// This option is useful when only the SDK libraries are needed.
 /// If [compile] is `true`, then after generating the documents, compile the
 /// viewer with dart2js.
 /// If [serve] is `true`, then after generating the documents we fire up a
 /// simple server to view the documentation.
 ///
 /// Returned Future completes with true if document generation is successful.
 Future<bool> docgen(List<String> files, {String packageRoot,
-    bool outputToYaml: true, bool includePrivate: false, bool includeSdk: false,
+    bool outputToYaml: false, bool includePrivate: false, bool includeSdk: false,
     bool parseSdk: false, bool append: false, String introFileName: '',
-    out: _DEFAULT_OUTPUT_DIRECTORY, List<String> excludeLibraries : const [],
+    String out: _DEFAULT_OUTPUT_DIRECTORY,
+    List<String> excludeLibraries : const [],
     bool includeDependentPackages: false, bool compile: false,
     bool serve: false, bool noDocs: false, String startPage, String pubScript,
     String dartBinary}) {
   var result;
   if (!noDocs) {
     _Viewer.ensureMovedViewerCode();
     result = _Generator.generateDocumentation(files, packageRoot: packageRoot,
         outputToYaml: outputToYaml, includePrivate: includePrivate,
         includeSdk: includeSdk, parseSdk: parseSdk, append: append,
         introFileName: introFileName, out: out,
@@ skipping 2071 matching lines @@
         .map((e) => originalMirror.getField(e.simpleName).reflectee)
         .where((e) => e != null)
         .toList();
   }
 
   Map toMap() => {
     'name': Indexable.getDocgenObject(mirror, owningLibrary).docName,
     'parameters': parameters
   };
 }