test rename overhaul: step 5 - frog and leg tests

frog/tests/leg_only/src/NotEqualsTest.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.
-
-void main() {
-  var x = 3;
-  if (x != x) {
-    throw "x != x with x == 3";
-  } else {
-    print('good');
-  }
-  var y = x;
-  if (x != y) throw "3 != 3";
-
-  var z = 4;
-  if (x != z) {
-    print('good');
-  } else {
-    throw 'x == z';
-  }
-}