test rename overhaul: step 8 - language tests

tests/language/prefix21_test.dart

Index: tests/language/prefix21_test.dart
diff --git a/tests/language/src/Prefix21Test.dart b/tests/language/prefix21_test.dart
similarity index 76%
rename from tests/language/src/Prefix21Test.dart
rename to tests/language/prefix21_test.dart
index 283b886b3887ed0ec413cc221f97e2963defb7f6..ff99189c92ca5072efc7350a8e7345651a4fae55 100644
--- a/tests/language/src/Prefix21Test.dart
+++ b/tests/language/prefix21_test.dart
@@ -3,8 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 #library("Prefix21");
-#import("Prefix21GoodLib.dart", prefix: "good");
-#import("Prefix21BadLib.dart", prefix: "bad");
+#import("prefix21_good_lib.dart", prefix: "good");
+#import("prefix21_bad_lib.dart", prefix: "bad");
 
 main() {
   Expect.equals(good.getValue(42), 42);