Test pre-release dependencies (#393)

Co-authored-by: Philipp A. <flying-sheep@web.de>

Author: grst

{{cookiecutter.project_name}}/pyproject.toml

@@ -72,11 +72,26 @@ scripts.build = "sphinx-build -M html docs docs/_build {args}"
 scripts.open = "python -m webbrowser -t docs/_build/html/index.html"
 scripts.clean = "git clean -fdX -- {args:docs}"
 
+# Test the lowest and highest supported Python versions with normal deps
 [[tool.hatch.envs.hatch-test.matrix]]
+deps = [ "stable" ]
 python = [ "3.10", "3.13" ]
+
+# Test the newest supported Python version also with pre-release deps
+[[tool.hatch.envs.hatch-test.matrix]]
+deps = [ "pre" ]
+python = [ "3.13" ]
+
 [tool.hatch.envs.hatch-test]
 features = [ "test" ]
 
+[tool.hatch.envs.hatch-test.overrides]
+# If the matrix variable `deps` is set to "pre",
+# set the environment variable `UV_PRERELEASE` to "allow".
+matrix.deps.env-vars = [
+  { key = "UV_PRERELEASE", value = "allow", if = [ "pre" ] },
+]
+
 [tool.ruff]
 line-length = 120
 src = [ "src" ]