Add test for invalid PDF metadata warnings.

QuLogic · QuLogic · commit 1970ce3a53c7 · 2020-09-11T03:26:47.000-04:00
diff --git a/lib/matplotlib/tests/test_backend_pdf.py b/lib/matplotlib/tests/test_backend_pdf.py
@@ -161,6 +161,22 @@ def test_savefig_metadata(monkeypatch):
     }
 
 
+def test_invalid_metadata(monkeypatch):
+    fig, ax = plt.subplots()
+
+    with pytest.warns(UserWarning,
+                      match='not an instance of datetime.datetime.'):
+        fig.savefig(io.BytesIO(), format='pdf',
+                    metadata={'ModDate': '1968-08-01'})
+
+    with pytest.warns(UserWarning,
+                      match='not one of {"True", "False", "Unknown"}'):
+        fig.savefig(io.BytesIO(), format='pdf', metadata={'Trapped': 'foo'})
+
+    with pytest.warns(UserWarning, match='not an instance of str.'):
+        fig.savefig(io.BytesIO(), format='pdf', metadata={'Title': 1234})
+
+
 def test_multipage_metadata(monkeypatch):
     pikepdf = pytest.importorskip('pikepdf')
     monkeypatch.setenv('SOURCE_DATE_EPOCH', '0')
