add test deps to setup.py

Author: espdev

setup.py

@@ -34,7 +34,7 @@ def get_long_description():
     ],
     extras_require={
         'docs': ['sphinx>=2.3, <3', 'Pallets-Sphinx-Themes', 'm2r'],
-        'tests': ['pytest'],
+        'tests': ['coverage <6', 'pytest', 'pytest-cov', 'coveralls'],
     },
     url='https://github.com/click-contrib/click-option-group',
     project_urls={

tox.ini

@@ -1,19 +1,16 @@
 [tox]
 envlist = py{36,37,38}-pytest-coverage, flake8
+skipsdist = True
 
 [testenv]
-deps = pytest
-commands = pytest --color=yes -v {posargs}
+commands =
+    pip install -e .[tests]
+    pytest --color=yes -v {posargs}
 
 [testenv:py37-pytest-coverage]
-usedevelop = true
 passenv = TRAVIS TRAVIS_*
-deps =
-    pytest
-    coverage <6
-    pytest-cov
-    coveralls
 commands =
+    pip install -e .[tests]
     pytest --cov=click_option_group --color=yes -v {posargs}
     coveralls