diff --git a/lib/matplotlib/testing/decorators.py b/lib/matplotlib/testing/decorators.py
index 25374604637d..10d6f2a6cb34 100644
--- a/lib/matplotlib/testing/decorators.py
+++ b/lib/matplotlib/testing/decorators.py
@@ -389,9 +389,17 @@ def decorator(func):
import pytest
_, result_dir = _image_directories(func)
+ old_sig = inspect.signature(func)
@pytest.mark.parametrize("ext", extensions)
- def wrapper(*args, ext, request, **kwargs):
+ def wrapper(*args, **kwargs):
+ ext = kwargs['ext']
+ if 'ext' not in old_sig.parameters:
+ kwargs.pop('ext')
+ request = kwargs['request']
+ if 'request' not in old_sig.parameters:
+ kwargs.pop('request')
+
file_name = "".join(c for c in request.node.name
if c in ALLOWED_CHARS)
try:
@@ -409,16 +417,16 @@ def wrapper(*args, ext, request, **kwargs):
plt.close(fig_test)
plt.close(fig_ref)
- sig = inspect.signature(func)
- new_sig = sig.replace(
- parameters=([param
- for param in sig.parameters.values()
- if param.name not in {"fig_test", "fig_ref"}]
- + [
- inspect.Parameter("ext", KEYWORD_ONLY),
- inspect.Parameter("request", KEYWORD_ONLY),
- ])
- )
+ parameters = [
+ param
+ for param in old_sig.parameters.values()
+ if param.name not in {"fig_test", "fig_ref"}
+ ]
+ if 'ext' not in old_sig.parameters:
+ parameters += [inspect.Parameter("ext", KEYWORD_ONLY)]
+ if 'request' not in old_sig.parameters:
+ parameters += [inspect.Parameter("request", KEYWORD_ONLY)]
+ new_sig = old_sig.replace(parameters=parameters)
wrapper.__signature__ = new_sig
# reach a bit into pytest internals to hoist the marks from
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