Add more tests for .packages

tests/standalone/package/scenarios/empty_packages_file/empty_packages_file_noimports_test.dart

Index: tests/standalone/package/scenarios/empty_packages_file/empty_packages_file_noimports_test.dart
diff --git a/tests/standalone/package/scenarios/packages_file_in_parent/sub/packages_file_in_parent_test.dart b/tests/standalone/package/scenarios/empty_packages_file/empty_packages_file_noimports_test.dart
similarity index 53%
copy from tests/standalone/package/scenarios/packages_file_in_parent/sub/packages_file_in_parent_test.dart
copy to tests/standalone/package/scenarios/empty_packages_file/empty_packages_file_noimports_test.dart
index 106b1af87535443c2ac8064d8c1071be8e0a7f50..580bb019098af7b3f55707ee8372e4e0b239c6bb 100644
--- a/tests/standalone/package/scenarios/packages_file_in_parent/sub/packages_file_in_parent_test.dart
+++ b/tests/standalone/package/scenarios/empty_packages_file/empty_packages_file_noimports_test.dart
@@ -3,13 +3,11 @@
 // BSD-style license that can be found in the LICENSE file.
 
 // PackageRoot=none
+// Packages=.packages
 
-library packages_file_in_parent_test;
-
-import 'package:foo/foo.dart' as foo;
+// We expect this to not cause any errors. An empty packages file is valid,
+// you should only run into problems if you try to resolve a package import.
+library empty_packages_file_noimports_test;
 
 main() {
-  if (foo.bar != 'hello') {
-    throw new Exception('package "foo" was not resolved correctly');
-  }
 }