diff --git a/pandas/tests/extension/arrow/bool.py b/pandas/tests/extension/arrow/bool.py
index d595879e3cb7d..e6f997b01aad2 100644
--- a/pandas/tests/extension/arrow/bool.py
+++ b/pandas/tests/extension/arrow/bool.py
@@ -10,9 +10,10 @@
 
 import numpy as np
 import pyarrow as pa
+
 import pandas as pd
 from pandas.api.extensions import (
-    ExtensionDtype, ExtensionArray, take, register_extension_dtype
+    ExtensionArray, ExtensionDtype, register_extension_dtype, take
 )
 
 
diff --git a/pandas/tests/extension/arrow/test_bool.py b/pandas/tests/extension/arrow/test_bool.py
index 5a01533cfc564..f259e66e6cc76 100644
--- a/pandas/tests/extension/arrow/test_bool.py
+++ b/pandas/tests/extension/arrow/test_bool.py
@@ -1,12 +1,13 @@
 import numpy as np
 import pytest
+
 import pandas as pd
 import pandas.util.testing as tm
 from pandas.tests.extension import base
 
 pytest.importorskip('pyarrow', minversion="0.10.0")
 
-from .bool import ArrowBoolDtype, ArrowBoolArray
+from .bool import ArrowBoolArray, ArrowBoolDtype
 
 
 @pytest.fixture
@@ -17,7 +18,7 @@ def dtype():
 @pytest.fixture
 def data():
     return ArrowBoolArray.from_scalars(np.random.randint(0, 2, size=100,
-                                       dtype=bool))
+                                                         dtype=bool))
 
 
 @pytest.fixture
diff --git a/pandas/tests/extension/base/dtype.py b/pandas/tests/extension/base/dtype.py
index d5cf9571e3622..e9d1f183812cc 100644
--- a/pandas/tests/extension/base/dtype.py
+++ b/pandas/tests/extension/base/dtype.py
@@ -1,6 +1,7 @@
 import warnings
 
 import numpy as np
+
 import pandas as pd
 
 from .base import BaseExtensionTests
diff --git a/pandas/tests/extension/base/getitem.py b/pandas/tests/extension/base/getitem.py
index 22b21102fa4ae..00bb3b5d4eec2 100644
--- a/pandas/tests/extension/base/getitem.py
+++ b/pandas/tests/extension/base/getitem.py
@@ -1,5 +1,5 @@
-import pytest
 import numpy as np
+import pytest
 
 import pandas as pd
 import pandas.util.testing as tm
diff --git a/pandas/tests/extension/base/groupby.py b/pandas/tests/extension/base/groupby.py
index 52c635d286df6..dd406ca0cd5ed 100644
--- a/pandas/tests/extension/base/groupby.py
+++ b/pandas/tests/extension/base/groupby.py
@@ -1,7 +1,8 @@
 import pytest
 
-import pandas.util.testing as tm
 import pandas as pd
+import pandas.util.testing as tm
+
 from .base import BaseExtensionTests
 
 
diff --git a/pandas/tests/extension/base/methods.py b/pandas/tests/extension/base/methods.py
index dce91d5a9ca9c..f7649415f2471 100644
--- a/pandas/tests/extension/base/methods.py
+++ b/pandas/tests/extension/base/methods.py
@@ -1,5 +1,5 @@
-import pytest
 import numpy as np
+import pytest
 
 import pandas as pd
 import pandas.util.testing as tm
diff --git a/pandas/tests/extension/base/ops.py b/pandas/tests/extension/base/ops.py
index 7baa6284e398f..2161214190be0 100644
--- a/pandas/tests/extension/base/ops.py
+++ b/pandas/tests/extension/base/ops.py
@@ -1,9 +1,10 @@
-import pytest
-
 import operator
 
+import pytest
+
 import pandas as pd
 from pandas.core import ops
+
 from .base import BaseExtensionTests
 
 
diff --git a/pandas/tests/extension/base/reduce.py b/pandas/tests/extension/base/reduce.py
index 4f6c7988314c0..c4b70f2013265 100644
--- a/pandas/tests/extension/base/reduce.py
+++ b/pandas/tests/extension/base/reduce.py
@@ -1,7 +1,10 @@
 import warnings
+
 import pytest
-import pandas.util.testing as tm
+
 import pandas as pd
+import pandas.util.testing as tm
+
 from .base import BaseExtensionTests
 
 
diff --git a/pandas/tests/extension/base/reshaping.py b/pandas/tests/extension/base/reshaping.py
index 7f13c2cd67373..446912b66bf33 100644
--- a/pandas/tests/extension/base/reshaping.py
+++ b/pandas/tests/extension/base/reshaping.py
@@ -1,5 +1,5 @@
-import pytest
 import numpy as np
+import pytest
 
 import pandas as pd
 from pandas.core.internals import ExtensionBlock
diff --git a/pandas/tests/extension/base/setitem.py b/pandas/tests/extension/base/setitem.py
index 029a77acb121f..72316b5b7eb91 100644
--- a/pandas/tests/extension/base/setitem.py
+++ b/pandas/tests/extension/base/setitem.py
@@ -5,6 +5,7 @@
 
 import pandas as pd
 import pandas.util.testing as tm
+
 from .base import BaseExtensionTests
 
 
diff --git a/pandas/tests/extension/decimal/array.py b/pandas/tests/extension/decimal/array.py
index fe07aae61c5e2..e47b8049ae65c 100644
--- a/pandas/tests/extension/decimal/array.py
+++ b/pandas/tests/extension/decimal/array.py
@@ -6,8 +6,7 @@
 import numpy as np
 
 import pandas as pd
-from pandas.core.arrays import (ExtensionArray,
-                                ExtensionScalarOpsMixin)
+from pandas.core.arrays import ExtensionArray, ExtensionScalarOpsMixin
 from pandas.core.dtypes.base import ExtensionDtype
 
 
diff --git a/pandas/tests/extension/decimal/test_decimal.py b/pandas/tests/extension/decimal/test_decimal.py
index be1c61166e4b1..59e77c3f0f3f3 100644
--- a/pandas/tests/extension/decimal/test_decimal.py
+++ b/pandas/tests/extension/decimal/test_decimal.py
@@ -1,15 +1,15 @@
-import operator
 import decimal
+import operator
 
 import numpy as np
-import pandas as pd
-from pandas import compat
-import pandas.util.testing as tm
 import pytest
 
+import pandas as pd
+import pandas.util.testing as tm
+from pandas import compat
 from pandas.tests.extension import base
 
-from .array import DecimalDtype, DecimalArray, make_data, to_decimal
+from .array import DecimalArray, DecimalDtype, make_data, to_decimal
 
 
 @pytest.fixture
diff --git a/pandas/tests/extension/json/array.py b/pandas/tests/extension/json/array.py
index 5c63e50c3eaaa..75b0f6b02edad 100644
--- a/pandas/tests/extension/json/array.py
+++ b/pandas/tests/extension/json/array.py
@@ -20,8 +20,8 @@
 import numpy as np
 
 from pandas import compat
-from pandas.core.dtypes.base import ExtensionDtype
 from pandas.core.arrays import ExtensionArray
+from pandas.core.dtypes.base import ExtensionDtype
 
 
 class JSONDtype(ExtensionDtype):
diff --git a/pandas/tests/extension/json/test_json.py b/pandas/tests/extension/json/test_json.py
index 15d99f6c5d2fc..d6528e3085527 100644
--- a/pandas/tests/extension/json/test_json.py
+++ b/pandas/tests/extension/json/test_json.py
@@ -1,5 +1,5 @@
-import operator
 import collections
+import operator
 
 import pytest
 
diff --git a/pandas/tests/extension/test_categorical.py b/pandas/tests/extension/test_categorical.py
index a4518798aa400..b5ded1890ae64 100644
--- a/pandas/tests/extension/test_categorical.py
+++ b/pandas/tests/extension/test_categorical.py
@@ -15,14 +15,14 @@
 """
 import string
 
-import pytest
-import pandas as pd
 import numpy as np
+import pytest
 
-from pandas.api.types import CategoricalDtype
+import pandas as pd
+import pandas.util.testing as tm
 from pandas import Categorical
+from pandas.api.types import CategoricalDtype
 from pandas.tests.extension import base
-import pandas.util.testing as tm
 
 
 def make_data():
diff --git a/pandas/tests/extension/test_common.py b/pandas/tests/extension/test_common.py
index a0a8f86a5d7b5..8a026a0c38283 100644
--- a/pandas/tests/extension/test_common.py
+++ b/pandas/tests/extension/test_common.py
@@ -4,8 +4,8 @@
 import pandas as pd
 import pandas.util.testing as tm
 from pandas.core.arrays import ExtensionArray
-from pandas.core.dtypes.common import is_extension_array_dtype
 from pandas.core.dtypes import dtypes
+from pandas.core.dtypes.common import is_extension_array_dtype
 
 
 class DummyDtype(dtypes.ExtensionDtype):
diff --git a/pandas/tests/extension/test_external_block.py b/pandas/tests/extension/test_external_block.py
index aa32bf6051617..1b3f285e64059 100644
--- a/pandas/tests/extension/test_external_block.py
+++ b/pandas/tests/extension/test_external_block.py
@@ -2,14 +2,12 @@
 # pylint: disable=W0102
 
 import numpy as np
+import pytest
 
 import pandas as pd
-from pandas.core.internals import (
-    BlockManager, SingleBlockManager)
+from pandas.core.internals import BlockManager, SingleBlockManager
 from pandas.core.internals.blocks import Block, NonConsolidatableMixIn
 
-import pytest
-
 
 class CustomBlock(NonConsolidatableMixIn, Block):
 
diff --git a/pandas/tests/extension/test_integer.py b/pandas/tests/extension/test_integer.py
index 26b09d545378b..680cf83c64b9e 100644
--- a/pandas/tests/extension/test_integer.py
+++ b/pandas/tests/extension/test_integer.py
@@ -14,16 +14,16 @@
 
 """
 import numpy as np
-import pandas as pd
 import pytest
 
-from pandas.tests.extension import base
-from pandas.core.dtypes.common import is_extension_array_dtype
-
+import pandas as pd
 from pandas.core.arrays import integer_array
 from pandas.core.arrays.integer import (
-    Int8Dtype, Int16Dtype, Int32Dtype, Int64Dtype,
-    UInt8Dtype, UInt16Dtype, UInt32Dtype, UInt64Dtype)
+    Int8Dtype, Int16Dtype, Int32Dtype, Int64Dtype, UInt8Dtype, UInt16Dtype,
+    UInt32Dtype, UInt64Dtype
+)
+from pandas.core.dtypes.common import is_extension_array_dtype
+from pandas.tests.extension import base
 
 
 def make_data():
diff --git a/pandas/tests/extension/test_interval.py b/pandas/tests/extension/test_interval.py
index 183ebea927b10..3ffb88ef302e9 100644
--- a/pandas/tests/extension/test_interval.py
+++ b/pandas/tests/extension/test_interval.py
@@ -13,14 +13,14 @@
 be added to the array-specific tests in `pandas/tests/arrays/`.
 
 """
-import pytest
 import numpy as np
+import pytest
 
+import pandas.util.testing as tm
 from pandas import Interval
 from pandas.core.arrays import IntervalArray
 from pandas.core.dtypes.dtypes import IntervalDtype
 from pandas.tests.extension import base
-import pandas.util.testing as tm
 
 
 def make_data():
diff --git a/pandas/tests/extension/test_sparse.py b/pandas/tests/extension/test_sparse.py
index 6946da6fdc36d..8c038b3950a26 100644
--- a/pandas/tests/extension/test_sparse.py
+++ b/pandas/tests/extension/test_sparse.py
@@ -1,11 +1,11 @@
-import pytest
-import pandas as pd
 import numpy as np
+import pytest
 
+import pandas as pd
+import pandas.util.testing as tm
 from pandas import SparseArray, SparseDtype
 from pandas.errors import PerformanceWarning
 from pandas.tests.extension import base
-import pandas.util.testing as tm
 
 
 def make_data(fill_value):
diff --git a/setup.cfg b/setup.cfg
index 162c6983f9e29..e1d0dc84f464a 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -246,6 +246,7 @@ skip=
     pandas/tests/indexes/timedeltas/test_partial_slicing.py,
     pandas/tests/indexes/timedeltas/test_timedelta_range.py,
     pandas/tests/indexes/timedeltas/test_ops.py,
+    pandas/tests/series/test_duplicates.py,
     pandas/tests/series/indexing/test_callable.py,
     pandas/tests/arrays/test_datetimelike.py,
     pandas/tests/arrays/test_integer.py,
@@ -255,29 +256,6 @@ skip=
     pandas/tests/util/test_testing.py,
     pandas/tests/util/test_util.py,
     pandas/tests/util/test_hashing.py,
-    pandas/tests/series/test_duplicates.py
-    pandas/tests/extension/test_common.py,
-    pandas/tests/extension/test_integer.py,
-    pandas/tests/extension/test_external_block.py,
-    pandas/tests/extension/test_interval.py,
-    pandas/tests/extension/test_categorical.py,
-    pandas/tests/extension/base/ops.py,
-    pandas/tests/extension/base/reshaping.py,
-    pandas/tests/extension/base/getitem.py,
-    pandas/tests/extension/base/groupby.py,
-    pandas/tests/extension/base/constructors.py,
-    pandas/tests/extension/base/interface.py,
-    pandas/tests/extension/base/dtype.py,
-    pandas/tests/extension/base/casting.py,
-    pandas/tests/extension/base/methods.py,
-    pandas/tests/extension/base/missing.py,
-    pandas/tests/extension/base/setitem.py,
-    pandas/tests/extension/arrow/test_bool.py,
-    pandas/tests/extension/arrow/bool.py,
-    pandas/tests/extension/decimal/array.py,
-    pandas/tests/extension/decimal/test_decimal.py,
-    pandas/tests/extension/json/array.py,
-    pandas/tests/extension/json/test_json.py,
     pandas/tests/io/test_clipboard.py,
     pandas/tests/io/test_compression.py,
     pandas/tests/io/test_pytables.py,
@@ -483,3 +461,4 @@ skip=
     pandas/plotting/_misc.py,
     pandas/types/common.py,
     pandas/plotting/_compat.py,
+    pandas/tests/extension/arrow/test_bool.py