Fixed numexpr engine fixture

Author: WillAyd

pandas/tests/computation/test_eval.py

@@ -31,17 +31,16 @@
     assert_series_equal, makeCustomDataframe as mkdf, randbool)
 
 
-@pytest.fixture(params=(
-    pytest.param(engine,
-                 marks=pytest.mark.skipif(
-                     engine == 'numexpr' and not _USE_NUMEXPR,
-                     reason='numexpr enabled->{enabled}, '
-                            'installed->{installed}'.format(
-                                enabled=_USE_NUMEXPR,
-                                installed=_NUMEXPR_INSTALLED)))
-                 for engine in _engines))  # noqa
+@pytest.fixture(params=_engines)
 def engine(request):
-    return request.param
+    engine = request.param
+    if engine == 'numexpr' and not _USE_NUMEXPR:
+        pytest.skip('numexpr enabled->{enabled}, '
+                    'installed->{installed}'.format(
+                        enabled=_USE_NUMEXPR,
+                        installed=_NUMEXPR_INSTALLED))
+
+    return engine
 
 
 @pytest.fixture(params=expr._parsers)