Don't run clearly Py2 tests on Py3.

These are only stage 1 futurizations, which don't guarantee Py3
compatibility, so don't run them.

Author: QuLogic

future/tests/test_futurize.py

@@ -13,6 +13,7 @@
 
 from future.tests.base import (CodeHandler, unittest, skip26, reformat_code,
                                order_future_lines)
+from future.utils import PY2
 
 
 class TestLibFuturize(unittest.TestCase):
@@ -682,7 +683,7 @@ def test_xrange(self):
         for i in xrange(10):
             pass
         '''
-        self.unchanged(code, stages=[1])
+        self.unchanged(code, stages=[1], run=PY2)
 
     @unittest.expectedFailure
     def test_absolute_import_changes(self):
@@ -719,7 +720,7 @@ def test_safe_futurize_imports(self):
         HTMLParser.HTMLParser
         assert list(ifilterfalse(lambda x: x % 2, [2, 4])) == [2, 4]
         """
-        self.unchanged(before, stages=[1])
+        self.unchanged(before, stages=[1], run=PY2)
 
     def test_print(self):
         before = """
@@ -837,8 +838,8 @@ def test_stdlib_modules_not_changed(self):
         except AttributeError as e:
             pass
         """
-        self.convert_check(before, after, stages=[1])
-        
+        self.convert_check(before, after, stages=[1], run=PY2)
+
     def test_octal_literals(self):
         before = """
         mode = 0644

future/tests/test_standard_library.py

@@ -240,6 +240,7 @@ def test_itertools_zip_longest(self):
         self.assertEqual(list(zip_longest(a, b)),
                          [(1, 2), (2, 4), (None, 6)])
 
+    @unittest.skipIf(utils.PY3, 'generic import tests are for Py2 only')
     def test_import_failure_from_module(self):
         """
         Tests whether e.g. "import socketserver" succeeds in a module