Merge pull request #29890 from thomashopkins32/capture-subprocess-test-errors

timhoffm · web-flow · commit 9573103fa05e · 2025-07-30T22:37:10.000+02:00
Show subprocess stdout and stderr on pytest failure
diff --git a/lib/matplotlib/testing/__init__.py b/lib/matplotlib/testing/__init__.py
@@ -105,6 +105,16 @@ def subprocess_run_for_testing(command, env=None, timeout=60, stdout=None,
             import pytest
             pytest.xfail("Fork failure")
         raise
+    except subprocess.CalledProcessError as e:
+        if e.stdout:
+            _log.error(f"Subprocess output:\n{e.stdout}")
+        if e.stderr:
+            _log.error(f"Subprocess error:\n{e.stderr}")
+        raise e
+    if proc.stdout:
+        _log.debug(f"Subprocess output:\n{proc.stdout}")
+    if proc.stderr:
+        _log.debug(f"Subprocess error:\n{proc.stderr}")
     return proc
 
 
