Isolate logging context changes

pyproject.toml

@@ -114,6 +114,7 @@ xfail_strict = true
 junit_family = "xunit2"
 norecursedirs = "tests/integration/*"
 markers = [
+  "contextvars",
   "isolated",
   "pypy3323bug",
   "network",

tests/conftest.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: MIT
 
 import contextlib
+import contextvars
 import importlib.metadata
 import os
 import os.path
@@ -10,6 +11,8 @@
 import sysconfig
 import tempfile
 
+from functools import partial, update_wrapper
+
 import pytest
 
 import build.env
@@ -60,6 +63,16 @@ def is_integration(item):
     return os.path.basename(item.location[0]) == 'test_integration.py'
 
 
+def pytest_runtest_call(item: pytest.Item):
+    if item.get_closest_marker('contextvars'):
+        if isinstance(item, pytest.Function):
+            wrapped_function = partial(contextvars.copy_context().run, item.obj)
+            item.obj = update_wrapper(wrapped_function, item.obj)
+        else:
+            msg = 'cannot rewrap non-function item'
+            raise RuntimeError(msg)
+
+
 @pytest.fixture()
 def local_pip(monkeypatch):
     monkeypatch.setattr(build.env, '_valid_global_pip', lambda: None)

tests/test_ctx_logger.py

@@ -9,6 +9,9 @@
 import build._ctx
 
 
+pytestmark = pytest.mark.contextvars
+
+
 def test_default_ctx_logger(caplog: pytest.LogCaptureFixture):
     build._ctx.log('foo')
 

tests/test_main.py

@@ -14,6 +14,9 @@
 import build.__main__
 
 
+pytestmark = pytest.mark.contextvars
+
+
 build_open_owner = 'builtins'
 
 cwd = os.getcwd()

tests/test_projectbuilder.py

@@ -375,6 +375,7 @@ def demo_pkg_inline(tmp_path_factory):
     return next(out.iterdir())
 
 
+@pytest.mark.contextvars
 @pytest.mark.isolated
 def test_build_with_dep_on_console_script(tmp_path, demo_pkg_inline, capfd, mocker):
     """