move pytest coverage and parallelization to tox

* enables more usable/debuggable direct runs of pytest without changing config
* also fixed `posargs` default behavior on unit env to match the others

pytest.ini

@@ -10,11 +10,6 @@ addopts =
     --color yes
     --showlocals
     --verbose
-    --numprocesses auto
     --durations 10
     --durations-min 1
     --strict-markers
-    --cov
-    --cov-report html
-    --cov-report term
-    --cov-report xml

tox.ini

@@ -2,12 +2,15 @@
 envlist = linters, unit
 isolated_build = True
 
+[shared]
+pytest_cov_args = --cov --cov-report html --cov-report term --cov-report xml
+
 [testenv]
 description = Run all tests with {basepython}
 usedevelop = True
 deps =
     -r {toxinidir}/test/requirements.txt
-commands = pytest {posargs}
+commands = pytest -n auto {posargs}
 
 [testenv:linters{,-py39,-py310,-py311}]
 description = Run code linters
@@ -20,15 +23,15 @@ commands =
 
 [testenv:unit{,-py39,-py310,-py311}]
 description = Run unit tests
-commands = pytest {posargs:test/unit}
+commands = pytest -n auto test/unit {posargs} {[shared]pytest_cov_args}
 
 [testenv:pulp-integration{-py39,-py310,-py311}]
 # Some of these tests must run serially because of a shared resource
 # (the system policy.json file).
 description = Run pulp integration tests
 commands =
-    pytest -n 0 -m "serial" test/pulp_integration {posargs}
-    pytest -m "not serial" test/pulp_integration {posargs}
+    pytest -n auto -m "not serial" test/pulp_integration {posargs} {[shared]pytest_cov_args}
+    pytest -n 0 -m "serial" test/pulp_integration {posargs} {[shared]pytest_cov_args}
 
 [testenv:integration{,-py39,-py310,-py311}]
 description = Run integration tests
@@ -37,8 +40,8 @@ passenv =
     HOME
     KEEP_IMAGES
 commands =
-    pytest -m "not serial" test/integration {posargs}
-    pytest -n 0 -m "serial" test/integration {posargs}
+    pytest -n auto -m "not serial" test/integration {posargs} {[shared]pytest_cov_args}
+    pytest -n 0 -m "serial" test/integration {posargs} {[shared]pytest_cov_args}
 
 [testenv:docs]
 description = Build documentation