Use the new test runner.

test/utils_test.dart

Index: test/utils_test.dart
diff --git a/test/utils_test.dart b/test/utils_test.dart
index 423083d689d5bcbd117cf7d00d20046533dc835d..aadf914560d4c4a865668577eb7c1a6d0bfbc008 100644
--- a/test/utils_test.dart
+++ b/test/utils_test.dart
@@ -5,13 +5,11 @@
 library utils_test;
 
 import 'package:pub/src/utils.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 import 'test_pub.dart';
 
 main() {
-  initConfig();
-
   group('yamlToString()', () {
     test('null', () {
       expect(yamlToString(null), equals('null'));