Fix coverage analysis

Signed-off-by: Aurélien Bompard <[email protected]>

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = checks,licenses,docs,covclean,{py39,py310}-unit,covreport
+envlist = checks,licenses,docs,{py39,py310}-unit
 isolated_build = true
 
 [testenv]
@@ -11,19 +11,7 @@ allowlist_externals =
 commands_pre =
     poetry install
 commands =
-    unit: poetry run pytest -vv --cov --cov-append --cov-report= fasjson/tests/unit {posargs}
-depends =
-    {py39,py310}: covclean
-    covreport: py39-unit,py310-unit
-
-[testenv:covreport]
-commands =
-    -poetry run coverage html
-    poetry run coverage report -m
-
-[testenv:covclean]
-commands = poetry run coverage erase
-
+    unit: poetry run pytest -vv --cov --cov-report=html --cov-report=xml --cov-report=term-missing fasjson/tests/unit {posargs}
 
 [testenv:docs]
 changedir = docs