use tox for local testing with multiple python versions

poetry.lock

@@ -141,6 +141,14 @@ requests = ">=1.0.0"
 [package.extras]
 yaml = ["PyYAML (>=3.10)"]
 
+[[package]]
+name = "distlib"
+version = "0.3.4"
+description = "Distribution utilities"
+category = "main"
+optional = false
+python-versions = "*"
+
 [[package]]
 name = "docopt"
 version = "0.6.2"
@@ -149,6 +157,18 @@ category = "dev"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "filelock"
+version = "3.4.2"
+description = "A platform independent file lock."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["furo (>=2021.8.17b43)", "sphinx (>=4.1)", "sphinx-autodoc-typehints (>=1.12)"]
+testing = ["covdefaults (>=1.2.0)", "coverage (>=4)", "pytest (>=4)", "pytest-cov", "pytest-timeout (>=1.4.2)"]
+
 [[package]]
 name = "flake8"
 version = "4.0.1"
@@ -318,7 +338,7 @@ python-versions = "*"
 name = "packaging"
 version = "21.3"
 description = "Core utilities for Python packages"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -341,11 +361,23 @@ category = "main"
 optional = false
 python-versions = "*"
 
+[[package]]
+name = "platformdirs"
+version = "2.4.1"
+description = "A small Python module for determining appropriate platform-specific dirs, e.g. a \"user data dir\"."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+
+[package.extras]
+docs = ["Sphinx (>=4)", "furo (>=2021.7.5b38)", "proselint (>=0.10.2)", "sphinx-autodoc-typehints (>=1.12)"]
+test = ["appdirs (==1.4.4)", "pytest (>=6)", "pytest-cov (>=2.7)", "pytest-mock (>=3.6)"]
+
 [[package]]
 name = "pluggy"
 version = "1.0.0"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -365,7 +397,7 @@ python-versions = "*"
 name = "py"
 version = "1.11.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -389,7 +421,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "pyparsing"
 version = "3.0.6"
 description = "Python parsing module"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -520,10 +552,32 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
 name = "toml"
 version = "0.10.2"
 description = "Python Library for Tom's Obvious, Minimal Language"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
+[[package]]
+name = "tox"
+version = "3.24.5"
+description = "tox is a generic virtualenv management and test command line tool"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+
+[package.dependencies]
+colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
+filelock = ">=3.0.0"
+packaging = ">=14"
+pluggy = ">=0.12.0"
+py = ">=1.4.17"
+six = ">=1.14.0"
+toml = ">=0.9.4"
+virtualenv = ">=16.0.0,<20.0.0 || >20.0.0,<20.0.1 || >20.0.1,<20.0.2 || >20.0.2,<20.0.3 || >20.0.3,<20.0.4 || >20.0.4,<20.0.5 || >20.0.5,<20.0.6 || >20.0.6,<20.0.7 || >20.0.7"
+
+[package.extras]
+docs = ["pygments-github-lexers (>=0.0.5)", "sphinx (>=2.0.0)", "sphinxcontrib-autoprogram (>=0.1.5)", "towncrier (>=18.5.0)"]
+testing = ["flaky (>=3.4.0)", "freezegun (>=0.3.11)", "pytest (>=4.0.0)", "pytest-cov (>=2.5.1)", "pytest-mock (>=1.10.0)", "pytest-randomly (>=1.0.0)", "psutil (>=5.6.1)", "pathlib2 (>=2.3.3)"]
+
 [[package]]
 name = "typed-ast"
 version = "1.4.3"
@@ -577,6 +631,24 @@ brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
+[[package]]
+name = "virtualenv"
+version = "20.13.0"
+description = "Virtual Python Environment builder"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
+
+[package.dependencies]
+distlib = ">=0.3.1,<1"
+filelock = ">=3.2,<4"
+platformdirs = ">=2,<3"
+six = ">=1.9.0,<2"
+
+[package.extras]
+docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=21.3)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)", "packaging (>=20.0)"]
+
 [[package]]
 name = "werkzeug"
 version = "2.0.2"
@@ -603,7 +675,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "b54f622e5630967a5ee4078dedf7ad331cc9e3b064bfcd71c839583c002be28f"
+content-hash = "15798b3b3958a5650ed91f13d02450c2fcc0caebeb2fd23c79c6a63e7244aa39"
 
 [metadata.files]
 appdirs = [
@@ -699,9 +771,17 @@ coveralls = [
     {file = "coveralls-3.3.1-py2.py3-none-any.whl", hash = "sha256:f42015f31d386b351d4226389b387ae173207058832fbf5c8ec4b40e27b16026"},
     {file = "coveralls-3.3.1.tar.gz", hash = "sha256:b32a8bb5d2df585207c119d6c01567b81fba690c9c10a753bfe27a335bfc43ea"},
 ]
+distlib = [
+    {file = "distlib-0.3.4-py2.py3-none-any.whl", hash = "sha256:6564fe0a8f51e734df6333d08b8b94d4ea8ee6b99b5ed50613f731fd4089f34b"},
+    {file = "distlib-0.3.4.zip", hash = "sha256:e4b58818180336dc9c529bfb9a0b58728ffc09ad92027a3f30b7cd91e3458579"},
+]
 docopt = [
     {file = "docopt-0.6.2.tar.gz", hash = "sha256:49b3a825280bd66b3aa83585ef59c4a8c82f2c8a522dbe754a8bc8d08c85c491"},
 ]
+filelock = [
+    {file = "filelock-3.4.2-py3-none-any.whl", hash = "sha256:cf0fc6a2f8d26bd900f19bf33915ca70ba4dd8c56903eeb14e1e7a2fd7590146"},
+    {file = "filelock-3.4.2.tar.gz", hash = "sha256:38b4f4c989f9d06d44524df1b24bd19e167d851f19b50bf3e3559952dddc5b80"},
+]
 flake8 = [
     {file = "flake8-4.0.1-py2.py3-none-any.whl", hash = "sha256:479b1304f72536a55948cb40a32dce8bb0ffe3501e26eaf292c7e60eb5e0428d"},
     {file = "flake8-4.0.1.tar.gz", hash = "sha256:806e034dda44114815e23c16ef92f95c91e4c71100ff52813adf7132a6ad870d"},
@@ -847,6 +927,10 @@ pathspec = [
 peewee = [
     {file = "peewee-3.14.8.tar.gz", hash = "sha256:01bd7f734defb08d7a3346a0c0ca7011bc8d0d685934ec0e001b3371d522ec53"},
 ]
+platformdirs = [
+    {file = "platformdirs-2.4.1-py3-none-any.whl", hash = "sha256:1d7385c7db91728b83efd0ca99a5afb296cab9d0ed8313a45ed8ba17967ecfca"},
+    {file = "platformdirs-2.4.1.tar.gz", hash = "sha256:440633ddfebcc36264232365d7840a970e75e1018d15b4327d11f91909045fda"},
+]
 pluggy = [
     {file = "pluggy-1.0.0-py2.py3-none-any.whl", hash = "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"},
     {file = "pluggy-1.0.0.tar.gz", hash = "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159"},
@@ -986,6 +1070,10 @@ toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
+tox = [
+    {file = "tox-3.24.5-py2.py3-none-any.whl", hash = "sha256:be3362472a33094bce26727f5f771ca0facf6dafa217f65875314e9a6600c95c"},
+    {file = "tox-3.24.5.tar.gz", hash = "sha256:67e0e32c90e278251fea45b696d0fef3879089ccbe979b0c556d35d5a70e2993"},
+]
 typed-ast = [
     {file = "typed_ast-1.4.3-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:2068531575a125b87a41802130fa7e29f26c09a2833fea68d9a40cf33902eba6"},
     {file = "typed_ast-1.4.3-cp35-cp35m-manylinux1_x86_64.whl", hash = "sha256:c907f561b1e83e93fad565bac5ba9c22d96a54e7ea0267c708bffe863cbe4075"},
@@ -1034,6 +1122,10 @@ urllib3 = [
     {file = "urllib3-1.26.7-py2.py3-none-any.whl", hash = "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"},
     {file = "urllib3-1.26.7.tar.gz", hash = "sha256:4987c65554f7a2dbf30c18fd48778ef124af6fab771a377103da0585e2336ece"},
 ]
+virtualenv = [
+    {file = "virtualenv-20.13.0-py2.py3-none-any.whl", hash = "sha256:339f16c4a86b44240ba7223d0f93a7887c3ca04b5f9c8129da7958447d079b09"},
+    {file = "virtualenv-20.13.0.tar.gz", hash = "sha256:d8458cf8d59d0ea495ad9b34c2599487f8a7772d796f9910858376d1600dd2dd"},
+]
 werkzeug = [
     {file = "Werkzeug-2.0.2-py3-none-any.whl", hash = "sha256:63d3dc1cf60e7b7e35e97fa9861f7397283b75d765afcaefd993d6046899de8f"},
     {file = "Werkzeug-2.0.2.tar.gz", hash = "sha256:aa2bb6fc8dee8d6c504c0ac1e7f5f7dc5810a9903e793b6f715a9f015bdadb9a"},

pyproject.toml

@@ -7,7 +7,7 @@ readme = "README.md"
 include = ["run.py"]
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.8"
 apscheduler = "^3.6.3"
 pyrss2gen = "^1.1"
 profig = "^0.5.1"
@@ -17,6 +17,7 @@ Flask = "^2.0.1"
 requests = "^2.25.1"
 coverage = "^5.5"
 peewee = "^3.14.8"
+tox = "^3.24.5"
 
 [tool.poetry.dev-dependencies]
 rope = "^0.16.0"

tox.ini

@@ -0,0 +1,9 @@
+[tox]
+isolated_build = true
+envlist = py38, py39
+
+[testenv]
+whitelist_externals = poetry
+commands =
+    poetry install -v
+    poetry run pytest tests/