[ruff] Add bugbears check

Author: Pierre-Sassoulas

pyproject.toml

@@ -69,6 +69,7 @@ write_to = "pytest_asyncio/_version.py"
 [tool.ruff]
 line-length = 88
 lint.select = [
+  "B",      # bugbear
   "E",      # pycodestyle
   "F",      # pyflakes
   "PGH004", # pygrep-hooks - Use specific rule codes when using noqa
@@ -79,6 +80,10 @@ lint.select = [
   "UP",     # pyupgrade
   "W",      # pycodestyle
 ]
+lint.ignore = [
+  # bugbear ignore
+  "B028", # No explicit `stacklevel` keyword argument found
+]
 
 [tool.pytest.ini_options]
 python_files = [

pytest_asyncio/plugin.py

@@ -183,11 +183,11 @@ def _get_asyncio_mode(config: Config) -> Mode:
         val = config.getini("asyncio_mode")
     try:
         return Mode(val)
-    except ValueError:
+    except ValueError as e:
         modes = ", ".join(m.value for m in Mode)
         raise pytest.UsageError(
             f"{val!r} is not a valid asyncio_mode. Valid modes: {modes}."
-        )
+        ) from e
 
 
 _DEFAULT_FIXTURE_LOOP_SCOPE_UNSET = """\