Backport fixture

Author: TomAugspurger

pandas/conftest.py

@@ -105,6 +105,16 @@ def compression(request):
     return request.param
 
 
+@pytest.fixture(params=['gzip', 'bz2', 'zip',
+                        pytest.param('xz', marks=td.skip_if_no_lzma)])
+def compression_only(request):
+    """
+    Fixture for trying common compression types in compression tests excluding
+    uncompressed case
+    """
+    return request.param
+
+
 @pytest.fixture(scope='module')
 def datetime_tz_utc():
     from datetime import timezone