Convert the small packages in pkg to use "package:".

pkg/args/test/args_test.dart

Index: pkg/args/test/args_test.dart
diff --git a/pkg/args/test/args_test.dart b/pkg/args/test/args_test.dart
index 728ff7d7810437d96edaedeafd2885da257449b5..11627f3f8beec93af3d32110457f91c98781b20f 100644
--- a/pkg/args/test/args_test.dart
+++ b/pkg/args/test/args_test.dart
@@ -4,8 +4,7 @@
 
 library args_test;
 
-import '../../../pkg/unittest/lib/unittest.dart';
-
+import 'package:unittest/unittest.dart';
 import 'package:args/args.dart';
 
 main() {
@@ -188,47 +187,47 @@ main() {
         var args = parser.parse([]);
         expect(a, isNull);
       });
-      
+
       test('for multiple present, allowMultiple, options are invoked with '
            'value as a list', () {
         var a;
         var parser = new ArgParser();
-        parser.addOption('a', allowMultiple: true, 
+        parser.addOption('a', allowMultiple: true,
             callback: (value) => a = value);
-          
+
         var args = parser.parse(['--a=v', '--a=x']);
         expect(a, equals(['v', 'x']));
       });
-      
+
       test('for single present, allowMultiple, options are invoked with '
            ' value as a single element list', () {
         var a;
         var parser = new ArgParser();
         parser.addOption('a', allowMultiple: true,
             callback: (value) => a = value);
-        
+
         var args = parser.parse(['--a=v']);
         expect(a, equals(['v']));
       });
-      
+
       test('for absent, allowMultiple, options are invoked with default '
            'value as a list.', () {
         var a;
         var parser = new ArgParser();
         parser.addOption('a', allowMultiple: true, defaultsTo: 'v',
             callback: (value) => a = value);
-        
+
         var args = parser.parse([]);
         expect(a, equals(['v']));
       });
-      
+
       test('for absent, allowMultiple, options are invoked with value '
            'as an empty list.', () {
         var a;
         var parser = new ArgParser();
         parser.addOption('a', allowMultiple: true,
             callback: (value) => a = value);
-        
+
         var args = parser.parse([]);
         expect(a, isEmpty);
       });