Exclude problematic formats from tests, rather than including all other platforms

test/assembly/gyptest-assembly.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 A basic test of compiling assembler files.
 """
 
 import sys
 import TestGyp
 
 if sys.platform != 'win32':
   # TODO(bradnelson): get this working for windows.
-  test = TestGyp.TestGyp(formats=['make', 'ninja', 'scons', 'xcode'])
+  test = TestGyp.TestGyp(formats=['!msvs'])
 
   test.run_gyp('assembly.gyp', chdir='src')
 
   test.relocate('src', 'relocate/src')
 
   test.build('assembly.gyp', test.ALL, chdir='relocate/src')
 
   expect = """\
 Hello from program.c
 Got 42.
 """
   test.run_built_executable('program', chdir='relocate/src', stdout=expect)
 
 
   test.pass_test()