test rename overhaul: step 8 - language tests

tests/language/arithmetic_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // 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.
 // Dart test program to test arithmetic operations.
 
 class ArithmeticTest {
 
   static bool exceptionCaughtParseInt(String s) {
     try {
       Math.parseInt(s);
@@ skipping 397 matching lines @@
   static testMain() {
     for (int i = 0; i < 1500; i++) {
       runOne();
     }
   }
 }
 
 main() {
   ArithmeticTest.testMain();
 }