Allow single-dash options to be specified without a space before value.

tests/language/test_config.dart

Index: tests/language/test_config.dart
diff --git a/tests/language/test_config.dart b/tests/language/test_config.dart
index 578f9da87043a5f04fd3544c0720a55b789ae186..0ba616174a9d5b9e4049aefd44fac2b09ac4622c 100644
--- a/tests/language/test_config.dart
+++ b/tests/language/test_config.dart
@@ -9,6 +9,7 @@
 class LanguageTestSuite extends StandardTestSuite {
   LanguageTestSuite(Map configuration)
       : super(configuration,
+              "language",
               "tests/language/src",
               ["tests/language/language.status"]);
 }