chore: Test support for Python 3.13 (#3416)

Author: effigies

.github/workflows/test.yml

@@ -34,7 +34,7 @@ jobs:
     strategy:
       matrix:
         os: ['ubuntu-latest']
-        python-version: ['3.10', '3.11', '3.12']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
         dependencies: ['latest', 'pre']
         include:
           - os: ubuntu-latest

pyproject.toml

@@ -15,6 +15,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
 ]
 license = {file = "LICENSE"}
 requires-python = ">=3.10"

tox.ini

@@ -2,9 +2,8 @@
 requires =
   tox>=4
 envlist =
-  py3{10,11,12}-latest
+  py3{10,11,12,13}-{latest,pre}
   py310-min
-  py3{10,11,12}-pre
 skip_missing_interpreters = true
 
 # Configuration that allows us to split tests across GitHub runners effectively
@@ -13,6 +12,7 @@ python =
   3.10: py310
   3.11: py311
   3.12: py312
+  3.13: py313
 
 [gh-actions:env]
 DEPENDS =
@@ -42,8 +42,9 @@ deps =
   py313: traits @ git+https://github.com/enthought/traits.git@10954eb
 extras = test
 setenv =
-  pre: UV_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
   pre: PIP_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+  pre: UV_INDEX=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+  pre: UV_INDEX_STRATEGY=unsafe-best-match
 uv_resolution =
   min: lowest-direct