Update Python version support and fix PyPy test environments (#184)

* Update the tox environments

Removed Python 3.9, added PyPy3.11, Python 3.14, and 3.15.

* Fix PyPy tox environments

Recent versions (1.19.0+) of mypy depend on librt that fails to compile
on PyPy, breaking PyPy builds.

Author: Perlence

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: ["3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
         architecture: ["x86", "x64"]
         experimental: [false]
     defaults:
@@ -62,7 +62,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: ["3.14-dev"]
+        python-version: ["3.15-dev"]
         architecture: ["x86", "x64"]
         experimental: [true]
     defaults:
@@ -106,7 +106,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [Ubuntu, MacOS, Windows]
-        python-version: ["pypy3.10"]
+        python-version: ["pypy3.10", "pypy3.11"]
         architecture: ["x64"]
         experimental: [false]
     defaults:

tox.ini

@@ -1,13 +1,13 @@
 [gh-actions]
 python =
-    3.13-dev: python3.13
+    3.15-dev: py3.15
+    3.14: py3.14
     3.13: py3.13
     3.12: py3.12, lint, build, type
     3.11: py3.11
     3.10: py3.10
-    3.9: py3.9
+    pypy-3.11: pypy3.11
     pypy-3.10: pypy3.10
-    pypy-3.9: pypy3.9
 
 [tox]
 requires =
@@ -16,10 +16,9 @@ env_list =
     lint
     build
     type
-    py{3.9,3.10,3.11,3.12,3.13}
-    py{3.9,3.10,3.11,3.12,3.13}-win32
-    python3.13
-    pypy3.{9,10}
+    py3.{10,11,12,13,14,15}
+    py3.{10,11,12,13,14,15}-win32
+    pypy3.{10,11}
     coverage
 
 [testenv]
@@ -29,12 +28,26 @@ deps =
     pytest-cov>=6.0
     coverage>=7.6
     wheel>=0.45
-commands =
+commands_pre =
     pip install -e .
+commands =
     pytest . --cov --cov-report=term-missing -vv --doctest-glob="*.py"
     coverage report
     coverage xml
 
+[testenv:pypy3.{10,11}]
+description = Run Unit Tests on PyPy
+# We need to set skip_install so that the build system requirements from
+# pyproject.toml are not installed automatically.
+skip_install = true
+deps =
+    # Build system requirements. No mypy because, since version 1.19, it depends
+    # on librt, which cannot be built against PyPy.
+    setuptools
+    {[testenv]deps}
+commands_pre =
+    pip install --no-build-isolation -e .
+
 [testenv:lint]
 description = Run Linters
 deps =