Parameterize uri resolution and parsing of options, use package:path

test/message_generator_test.dart

 #!/usr/bin/env 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.
 
 library message_generator_test;
 
-import 'package:protoc-plugin/src/descriptor.pb.dart';
-import 'package:protoc-plugin/src/plugin.pb.dart';
-import 'package:protoc-plugin/protoc.dart';
+import 'package:protoc_plugin/src/descriptor.pb.dart';
+import 'package:protoc_plugin/src/plugin.pb.dart';
+import 'package:protoc_plugin/protoc.dart';
 import 'package:unittest/unittest.dart';
 
 void main() {
   test('testMessageGenerator', () {
     // NOTE: Below > 80 cols because it is matching generated code > 80 cols.
     String expected = r'''
 class PhoneNumber_PhoneType extends ProtobufEnum {
   static const PhoneNumber_PhoneType MOBILE = const PhoneNumber_PhoneType._(0, 'MOBILE');
   static const PhoneNumber_PhoneType HOME = const PhoneNumber_PhoneType._(1, 'HOME');
   static const PhoneNumber_PhoneType WORK = const PhoneNumber_PhoneType._(2, 'WORK');
@@ skipping 77 matching lines @@
             new FieldDescriptorProto()
                 ..name = 'name'
                 ..number = 3
                 ..label = FieldDescriptorProto_Label.LABEL_OPTIONAL
                 ..type = FieldDescriptorProto_Type.TYPE_STRING
                 ..defaultValue = r'$'
             ])
         ..enumType.add(ed);
     MemoryWriter buffer = new MemoryWriter();
     IndentingWriter writer = new IndentingWriter('  ', buffer);
-    var options =
-        new GenerationOptions(
-            new CodeGeneratorRequest(), new CodeGeneratorResponse());
-    var context = new GenerationContext(options);
+    var options = parseGenerationOptions(
+        new CodeGeneratorRequest(), new CodeGeneratorResponse());
+    var context = new GenerationContext(options,
+        new DefaultOutputConfiguration());
     FileGenerator fg = new FileGenerator(fd, null, context);
     MessageGenerator mg = new MessageGenerator(md, fg, context);
     mg.initializeFields();
     mg.generate(writer);
     expect(buffer.toString(), expected);
   });
 }