Sort imports and add isort as a check.

setup.py

@@ -1,23 +1,24 @@
 #!/usr/bin/env python
 # -*- encoding: utf-8 -*-
-from __future__ import absolute_import, print_function
+from __future__ import absolute_import
+from __future__ import print_function
 
 import io
-from itertools import chain
 import re
+from distutils.command.build import build
 from glob import glob
+from itertools import chain
 from os.path import basename
 from os.path import dirname
 from os.path import join
 from os.path import splitext
-from distutils.command.build import build
 
 from setuptools import Command
 from setuptools import find_packages
 from setuptools import setup
 from setuptools.command.develop import develop
-from setuptools.command.install_lib import install_lib
 from setuptools.command.easy_install import easy_install
+from setuptools.command.install_lib import install_lib
 
 
 def read(*names, **kwargs):

src/pytest_cov/engine.py

@@ -1,5 +1,4 @@
 """Coverage controllers for use by pytest-cov and nose-cov."""
-
 import contextlib
 import copy
 import os
@@ -10,8 +9,10 @@
 import coverage
 from coverage.data import CoverageData
 
+from .compat import StringIO
+from .compat import workerinput
+from .compat import workeroutput
 from .embed import cleanup
-from .compat import StringIO, workeroutput, workerinput
 
 
 class _NullFile(object):

src/pytest_cov/plugin.py

@@ -1,9 +1,10 @@
 """Coverage plugin for pytest."""
 import argparse
-import coverage
 import os
-import pytest
 import warnings
+
+import coverage
+import pytest
 from coverage.misc import CoverageException
 
 from . import compat

tests/test_pytest_cov.py

@@ -18,14 +18,14 @@
 from process_tests import wait_for_strings
 from six import exec_
 
+import pytest_cov.plugin
+from pytest_cov import compat
+
 try:
     from StringIO import StringIO
 except ImportError:
     from io import StringIO
 
-import pytest_cov.plugin
-from pytest_cov import compat
-
 coverage, platform      # required for skipif mark on test_cov_min_from_coveragerc
 
 max_worker_restart_0 = "--max-" + compat.worker + "-restart=0"

tox.ini

@@ -67,9 +67,11 @@ deps =
     flake8
     readme-renderer
     pygments
+    isort
 skip_install = true
 usedevelop = false
 commands =
     python setup.py check --strict --metadata --restructuredtext
     check-manifest {toxinidir}
     flake8 src tests setup.py
+    isort --check-only --diff --recursive src tests setup.py