Add extras_require=testing

tox.ini

@@ -1,16 +1,10 @@
 [tox]
 envlist = py27, py34, py35, py36
 [testenv]
-deps =
-    pytest>=2.3.5
-    pytest-cache
-# docopt for sith doctests
-    docopt
-# coloroma for colored debug output
-    colorama
+extras = testing
 # Overwrite the parso version (only used sometimes).
-#    git+https://github.com/davidhalter/parso.git
-    -rrequirements.txt
+# deps =
+#     git+https://github.com/davidhalter/parso.git
 passenv = JEDI_TEST_ENVIRONMENT
 setenv =
 # https://github.com/tomchristie/django-rest-framework/issues/1957
@@ -24,34 +18,29 @@ setenv =
     env36: JEDI_TEST_ENVIRONMENT=36
     env37: JEDI_TEST_ENVIRONMENT=37
 commands =
-    py.test {posargs:jedi test}
+    pytest {posargs:jedi test}
 [testenv:py27]
 deps =
 # for testing the typing module
     typing
 # numpydoc for typing scipy stack
     numpydoc
-    {[testenv]deps}
 [testenv:py34]
 deps =
     typing
     numpydoc
-    {[testenv]deps}
 [testenv:py35]
 deps =
     numpydoc
-    {[testenv]deps}
 [testenv:py36]
 deps =
     numpydoc
-    {[testenv]deps}
 [testenv:cov]
 deps =
     coverage
     numpydoc
-    {[testenv]deps}
 commands =
-    coverage run --source jedi -m py.test
+    coverage run --source jedi -m pytest
     coverage report
 [testenv:sith]
 commands =