Add tests for simple packages scenarios

tests/standalone/package/scenarios/packages_dir_only/packages_dir_only_test.dart

Index: tests/standalone/package/scenarios/packages_dir_only/packages_dir_only_test.dart
diff --git a/tests/language/regress_21998_1_test.dart b/tests/standalone/package/scenarios/packages_dir_only/packages_dir_only_test.dart
similarity index 55%
copy from tests/language/regress_21998_1_test.dart
copy to tests/standalone/package/scenarios/packages_dir_only/packages_dir_only_test.dart
index 3237f3396629f6fd11270e1adc290bec78713958..afec5b58fcf1814eeee4e5df5bd4d499b9063cfe 100644
--- a/tests/language/regress_21998_1_test.dart
+++ b/tests/standalone/package/scenarios/packages_dir_only/packages_dir_only_test.dart
@@ -2,17 +2,14 @@
 // 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:math' as Math;
-import 'package:expect/expect.dart';
+// PackageRoot=none
 
-main() {
-  Expect.equals(4, new C().m());
-}
+library packages_dir_only_test;
 
-class C {
-  max(a) => a;
+import 'package:foo/foo.dart' as foo;
 
-  m() {
-    return max(Math.max(2, 4));
+main() {
+  if (foo.bar != 'hello') {
+    throw new Exception('package "foo" was not resolved correctly');
   }
-}
+}