Split out coverage

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.4.0
-envlist = docs,flake8,mypy,twine,coverage,py{36,37,38,39,310},du{14,15,16,17,18}
+envlist = docs,flake8,mypy,twine,py{36,37,38,39,310},du{14,15,16,17,18}
 
 [testenv]
 usedevelop = True
@@ -58,16 +58,6 @@ extras =
 commands =
     isort --check-only --diff .
 
-[testenv:coverage]
-basepython = python3
-description =
-    Run code coverage checks.
-setenv =
-    PYTEST_ADDOPTS = --cov sphinx --cov-config "{toxinidir}/setup.cfg"
-commands =
-    {[testenv]commands}
-    coverage report
-
 [testenv:mypy]
 basepython = python3
 description =