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

test/protoc_options_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 file_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('testValidGeneratorOptions', () {
       checkValid(String parameter, Map expected) {
       var request = new CodeGeneratorRequest();
       if (parameter != null) request.parameter = parameter;
       var response = new CodeGeneratorResponse();
-      var options = new GenerationOptions(request, response);
+      var options = parseGenerationOptions(request, response);
       expect(options, new isInstanceOf<GenerationOptions>());
       expect(response.error, '');
-      expect(options.fieldNameOptions, equals(expected));
+      expect(options.fieldNameOverrides, equals(expected));
     }
 
     checkValid(null, {});
     checkValid('', {});
     checkValid(',', {});
     checkValid(',,,', {});
     checkValid('  , , ,', {});
 
     checkValid('field_name=a|b', {'.a' : 'b'});
     checkValid('field_name = a | b,,,', {'.a' : 'b'});
     checkValid('field_name=a|b,field_name=p.C|d', {'.a' : 'b', '.p.C' : 'd'});
     checkValid(' field_name = a | b,  , field_name = p.C | d ',
                {'.a' : 'b', '.p.C' : 'd'});
   });
 
   test('testInvalidGeneratorOptions', () {
       checkInvalid(String parameter) {
       var request = new CodeGeneratorRequest();
       if (parameter != null) request.parameter = parameter;
       var response = new CodeGeneratorResponse();
-      var options = new GenerationOptions(request, response);
+      var options = parseGenerationOptions(request, response);
       expect(options, isNull);
     }
 
     checkInvalid('abc');
     checkInvalid('abc,def');
     checkInvalid('field_name=');
     checkInvalid('field_name=a');
     checkInvalid('field_name=a|');
     checkInvalid('field_name=|');
     checkInvalid('field_name=|b');
   });
 }