Moved skip decorator to testing and created similar ones for OSX and linux, create delete testdirs in module setup/teardown

IPython/testing/decorators.py

@@ -155,6 +155,11 b" def skip(msg=''):"
     return inner
 
 # Decorators to skip certain tests on specific platforms.
-skip_win32 = skipif(sys.platform=='win32',"This test does not run under Windows")
-skip_linux = skipif(sys.platform=='linux2',"This test does not run under Linux")
-skip_osx = skipif(sys.platform=='darwin',"This test does not run under OSX")
+skip_win32 = skipif(sys.platform == 'win32',"This test does not run under Windows")
+skip_linux = skipif(sys.platform == 'linux2',"This test does not run under Linux")
+skip_osx = skipif(sys.platform == 'darwin',"This test does not run under OSX")
+
+# Decorators to skip tests if not on specific platforms.
+skip_if_not_win32 = skipif(sys.platform != 'win32', "This test only runs under Windows")
+skip_if_not_linux = skipif(sys.platform != 'linux2', "This test only runs under Linux")
+skip_if_not_osx = skipif(sys.platform != 'darwin', "This test only runs under OSX")

IPython/tests/test_genutils.py

@@ -38,7 +38,20 b' except ImportError:'
 
 test_file_path = split(abspath(__file__))[0]
 
-#skip_if_not_win32 = skipif(sys.platform!='win32',"This test only runs under Windows")
+#
+
+def setup():
+    try:
+        os.makedirs("home_test_dir/_ipython")
+    except WindowsError:
+        pass #Or should we complain that the test directory already exists??
+
+def teardown():
+    try:
+        os.removedirs("home_test_dir/_ipython")
+    except WindowsError:
+        pass #Or should we complain that the test directory already exists??
+
     
 def setup_environment():
     global oldstuff, platformstuff