Dynamically load packages for dartdevc tests in test.dart.

pkg/dev_compiler/test/options/options_test.dart

 // Copyright (c) 2016, 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.
 
 import 'dart:io';
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/command_line/arguments.dart';
 import 'package:analyzer/src/summary/summary_sdk.dart';
 import 'package:path/path.dart' as path;
 import 'package:test/test.dart';
@@ skipping 61 matching lines @@
   test('fromArgs options flag', () {
     var args = <String>['--$enableStrictCallChecksFlag'];
     //TODO(danrubel) remove sdkSummaryArgs once all SDKs have summary file
     args.addAll(sdkSummaryArgs);
     var argResults = ddcArgParser().parse(args);
     var options = new AnalyzerOptions.fromArguments(argResults);
     var compiler = new ModuleCompiler(options, analysisRoot: optionsDir);
     var analysisOptions = compiler.context.analysisOptions;
     expect(analysisOptions.enableStrictCallChecks, isTrue);
   });
+
+  test('custom module name for summary', () {
+    var args = <String>[
+      '-snormal',
+      '-scustom/path:module',
+      '-sanother',
+      '-scustom/path2:module2'
+    ];
+
+    var argResults = ddcArgParser().parse(args);
+    var options = new AnalyzerOptions.fromArguments(argResults);
+    expect(options.summaryPaths,
+        orderedEquals(['normal', 'custom/path', 'another', 'custom/path2']));
+    expect(options.customSummaryModules['custom/path'], equals('module'));
+    expect(options.customSummaryModules['custom/path2'], equals('module2'));
+    expect(options.customSummaryModules.containsKey('normal'), isFalse);
+  });
 }