matplotlib
diff --git a/‎lib/matplotlib/cbook/__init__.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cbook/__init__.py
+1-1Lines changed: 1 addition & 1 deletion b/‎lib/matplotlib/cbook/__init__.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cbook/__init__.py
+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎lib/matplotlib/tests/test_cbook.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_cbook.py
+6Lines changed: 6 additions & 0 deletions b/‎lib/matplotlib/tests/test_cbook.py
Copy file name to clipboardExpand all lines: lib/matplotlib/tests/test_cbook.py
+6Lines changed: 6 additions & 0 deletions
@@ -2041,7 +2041,7 @@ def _warn_external(message, category=None):
         if frame is None:
             # when called in embedded context may hit frame is None
             break
-        if not re.match(r"\A(matplotlib|mpl_toolkits)(\Z|\.)",
+        if not re.match(r"\A(matplotlib|mpl_toolkits)(\Z|\.(?!tests\.))",
                         # Work around sphinx-gallery not setting __name__.
                         frame.f_globals.get("__name__", "")):
             break
 
@@ -560,3 +560,9 @@ def func(pre, arg, post=None):
         func(1, 2)
     with pytest.warns(MatplotlibDeprecationWarning):
         func(1, 2, 3)
+
+
+def test_warn_external(recwarn):
+    cbook._warn_external("oops")
+    assert len(recwarn) == 1
+    assert recwarn[0].filename == __file__