add test requirements as extra

.github/workflows/python-tests.yml

@@ -40,7 +40,7 @@ jobs:
           update: true
       - run: pip install -U setuptools
         if: matrix.python_version != 'msys2'
-      - run: pip install -e .[toml] pytest virtualenv
+      - run: pip install -e .[toml,test]
       # pip2 is needed because Mercurial uses python2 on Ubuntu 20.04
       - run: |
           curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
@@ -58,7 +58,7 @@ jobs:
         with:
           python-version: "3.6"
           architecture: x64
-      - run: pip install -e .[toml] pytest virtualenv
+      - run: pip install -e .[toml,test] pytest virtualenv
       - run: pytest --test-legacy testing/test_setuptools_support.py || true # ignore fail flaky on ci
   check_selfinstall:
     runs-on: ubuntu-latest

setup.cfg

@@ -70,5 +70,8 @@ setuptools_scm.version_scheme =
     calver-by-date = setuptools_scm.version:calver_by_date
 
 [options.extras_require]
+test =
+    pytest>6.3
+    virtualenv>20
 toml =
     setuptools>=45

tox.ini

@@ -34,11 +34,12 @@ deps=
     pytest
     setuptools >= 45
     tomli
+    virtualenv>20
 commands=
     test: pytest []
     selfcheck: python setup.py --version
-extras =
-    toml
+
+
 
 [testenv:check_readme]
 skip_install=True