add pytest

{{ cookiecutter.project_slug }}/README.md

@@ -15,6 +15,25 @@ pip install git+{{ cookiecutter.project_url }}.git
 ## License
 
 This project if a free software released under the {{ cookiecutter.open_source_license }}.
+
+## Dev
+
+If you want to tinker with this project, you can clone it and install it in editable mode:
+
+```
+git clone {{ cookiecutter.project_url }}.git
+cd {{ cookiecutter.project_slug }}
+python -m venv venv && source venv/bin/activate
+pip install -e .[dev]
+```
+
+### Test
+
+Tests are run using `pytest`:
+
+```
+pytest
+```
 {% endif %}
 
 ## Author
@@ -24,3 +43,4 @@ This project if a free software released under the {{ cookiecutter.open_source_l
 ## Security
 
 If you discover a potential security issue in this project, please contact {{ cookiecutter.email }}.
+

{{ cookiecutter.project_slug }}/pyproject.toml

@@ -14,9 +14,20 @@ readme = "README.md"
 requires-python = ">={{ cookiecutter.python_min_version }}"
 dependencies = []
 
+[project.optional-dependencies]
+test = [
+  "pytest >=7.2.2",
+]
+dev = ["{{ cookiecutter.project_slug }}[test]"]
+
 [project.urls]
 "Homepage" = "{{ cookiecutter.project_url }}"
 "Bug Tracker" = "{{ cookiecutter.project_url }}/issues"
 
 [project.scripts]
 {{ cookiecutter.project_slug }} = "{{ cookiecutter.project_slug }}.cli:main"
+
+[tool.pytest.ini_options]
+addopts = [
+    "--import-mode=importlib",
+]

{{ cookiecutter.project_slug }}/tests/test_{{ cookiecutter.project_slug }}.py

@@ -0,0 +1,4 @@
+import {{ cookiecutter.project_slug }}
+
+def test_dummy():
+    assert True