use tox to run tests

pyproject.toml

@@ -30,4 +30,23 @@ tox = "3.14.1"
 twine = "2.0.0"
 
 [tool.poetry.scripts]
-padpo = "padpo.padpo:main"
+padpo = "padpo.padpo:main"
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"
+
+[tool.tox]
+legacy_tox_ini = """
+[tox]
+isolated_build = True
+envlist = py36, py37, py38
+
+[testenv]
+whitelist_externals = poetry
+changedir = {toxinidir}/tests
+commands =
+    poetry install -v
+    # poetry run pytest -s -vv --cov={envsitepackagesdir}/padpo
+    poetry run pytest -s -vv --cov=padpo
+"""

tests/test_po_without_warnings.py

@@ -0,0 +1,9 @@
+from padpo.padpo import check_file
+
+
+def test_hello():
+    assert True != False
+
+
+def test_coverage():
+    check_file("/home/vincent/Documents/programmation/padpo/functions.po")