Add tox as a dev dependency to test perfsephone across different ve…

…rsions of python (#4)

* Add `tox` as a dev dependency to test perfsephone across different versions of python

* Add section in readme documenting how tox can be used to run tests

README.md

@@ -27,4 +27,11 @@ Although profiling tools for python already exist, they either:
 * Do not integrate well with pytest, leaving out essential data, such as time spent in test setup,
 test teardown, and collection time;
 * Generate too much cruft. Perfsephone filters out call stacks related to pytest internals, which
-  cannot be optimized without optimizing pytest itself.
+  cannot be optimized without optimizing pytest itself.
+
+# Development
+Perfsephone's dependencies is managed using [*poetry*](https://python-poetry.org/docs/#installation).
+
+## Tests
+In order to run the project's unit tests & linting suite, run the following command:
+`poetry run tox -p`

pyproject.toml

@@ -23,6 +23,7 @@ pyinstrument = "^5.0.0"
 ruff = "^0.8"
 mypy = "^1.13.0"
 pytest = "^8.3.3"
+tox = "^4.23.2"
 
 [build-system]
 requires = ["poetry-core"]

tox.ini

@@ -0,0 +1,33 @@
+[tox]
+requires =
+    tox>=4
+env_list = 3.8, 3.9, 3.10, 3.11, 3.12, 3.13, test, lint, format, mypy
+
+commands_pre =
+    poetry install --no-root --sync
+
+[testenv]
+allowlist_externals = poetry
+
+commands =
+    poetry run pytest
+
+[testenv:format]
+description = check project formatting
+skip_install = true
+allowlist_externals = poetry
+commands =
+    poetry run ruff format
+
+
+[testenv:lint]
+description = check project linting
+skip_install = true
+allowlist_externals = poetry
+commands =
+    poetry run ruff check
+
+[testenv:mypy]
+allowlist_externals = poetry
+commands =
+    poetry run mypy .