Skip async tests correctly (#128)

tests/__init__.py

@@ -9,6 +9,10 @@
 REPO = os.path.dirname(DIR)
 WHITELISTS = glob.glob(os.path.join(REPO, 'vulture', 'whitelists', '*.py'))
 
+skip_if_not_has_async = pytest.mark.skipif(
+    not hasattr(ast, 'AsyncFunctionDef'),
+    reason="needs async support (added in Python 3.5)")
+
 
 def check(items_or_names, expected_names):
     if isinstance(items_or_names, set):
@@ -29,12 +33,6 @@ def check_unreachable(v, lineno, size, name):
     assert item.name == name
 
 
-def skip_if_not_has_async(function):
-    if not hasattr(ast, 'AsyncFunctionDef'):
-        pytest.mark.skip(
-            function, reason="needs async support (added in Python 3.5)")
-
-
 @pytest.fixture
 def v():
     return core.Vulture(verbose=True)

tests/test_scavenging.py

@@ -402,7 +402,7 @@ async def test_func():
 
 async def other_func():
     pass
-""", filename='test_function_names.py')
+""", filename='function_names.py')
     check(v.defined_funcs, ['test_func', 'other_func'])
     check(v.unused_funcs, ['other_func', 'test_func'])