add test's extra_require

setup.py

@@ -64,6 +64,9 @@ setup(name='pyquery',
       packages=find_packages(exclude=[
           'bootstrap', 'bootstrap-py3k', 'docs', 'tests', 'README_fixt'
       ]),
+      extras_require={
+        'test': ['requests', 'webob', 'webtest', 'pytest', 'pytest-cov'],
+      },
       include_package_data=True,
       zip_safe=False,
       install_requires=install_requires,

tox.ini

@@ -7,15 +7,10 @@ whitelist_externals=
 passenv=
     MOZ_HEADLESS
 commands =
-    rm -f .coverage
-    {envbindir}/pytest []
+    pytest []
 deps =
     py38: selenium
-    requests
-    WebOb>1.1.9
-    WebTest
-    pytest
-    pytest-cov
+    -e .[test]
 
 [testenv:flake8]
 skipsdist=true