- Add preliminary support for Python 3.12b4 (fixes #149)

.github/workflows/tests.yml

@@ -27,6 +27,7 @@ jobs:
         - ["3.9",   "py39"]
         - ["3.10",  "py310"]
         - ["3.11",  "py311"]
+        - ["3.12.0-beta.4",  "py312"]
         - ["pypy-3.9", "pypy3"]
         - ["3.9",   "docs"]
         - ["3.9",   "coverage"]
@@ -39,6 +40,7 @@ jobs:
         exclude:
           - { os: ["windows", "windows-latest"], config: ["3.9",   "lint"] }
           - { os: ["windows", "windows-latest"], config: ["3.9",   "docs"] }
+          - { os: ["windows", "windows-latest"], config: ["3.9",   "coverage"] }
 
     runs-on: ${{ matrix.os[1] }}
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name

.meta.toml

@@ -2,14 +2,14 @@
 # https://github.com/zopefoundation/meta/tree/master/config/pure-python
 [meta]
 template = "pure-python"
-commit-id = "66322213"
+commit-id = "49beb029"
 
 [python]
 with-pypy = true
 with-docs = true
 with-sphinx-doctests = false
 with-windows = true
-with-future-python = false
+with-future-python = true
 with-macos = false
 
 [coverage]

CHANGES.rst

@@ -5,7 +5,8 @@
 6.1 (unreleased)
 ================
 
-- Nothing changed yet.
+- Add preliminary support for Python 3.12b4.
+  (`#149 <https://github.com/zopefoundation/zope.testrunner/issues/149>`_)
 
 
 6.0 (2023-03-28)

src/zope/testrunner/tb_format.py

@@ -43,6 +43,20 @@ def _iter_chain(exc, custom_tb=None, seen=None):
         yield from it
 
 
+def _parse_value_tb(exc, value, tb):
+    # Taken straight from the traceback module code on Python 3.10, which
+    # introduced the ability to call print_exception with an exception
+    # instance as first parameter
+    if (value is None) != (tb is None):
+        raise ValueError("Both or neither of value and tb must be given")
+    if value is tb is None:
+        if exc is not None:
+            return exc, exc.__traceback__
+        else:
+            return None, None
+    return value, tb
+
+
 def format_exception(t, v, tb, limit=None, chain=None):
     if chain:
         values = _iter_chain(v, tb)
@@ -56,7 +70,8 @@ def format_exception(t, v, tb, limit=None, chain=None):
         return fmt.formatException(t, v, tb)
 
 
-def print_exception(t, v, tb, limit=None, file=None, chain=None):
+def print_exception(t, v=None, tb=None, limit=None, file=None, chain=None):
+    v, tb = _parse_value_tb(t, v, tb)
     if chain:
         values = _iter_chain(v, tb)
     else:

tox.ini

@@ -9,14 +9,21 @@ envlist =
     py39
     py310
     py311
+    py312
     pypy3
     docs
     coverage
     py{37,38,39,310,311,py3}-subunit
 
 [testenv]
 usedevelop = true
+package = wheel
+wheel_build_env = .pkg
+pip_pre = py312: true
 deps =
+setenv =
+    py312: VIRTUALENV_PIP=23.1.2
+    py312: PIP_REQUIRE_VIRTUALENV=0
 commands =
     zope-testrunner --test-path=src {posargs:-vc}
 extras =