Merge pull request #16556 from anntzer/psrobust

timhoffm · web-flow · commit 42259bb9715b · 2020-02-29T14:22:35.000+01:00
Make backend_ps test robust against timestamp changes in ghostscript.
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -1,5 +1,6 @@
 import io
 from pathlib import Path
+import re
 import tempfile
 
 import pytest
@@ -69,6 +70,13 @@ def test_savefig_to_stringio(format, use_log, rcParams, orientation,
         s_val = s_buf.getvalue().encode('ascii')
         b_val = b_buf.getvalue()
 
+        if rcParams.get("ps.usedistiller") or rcParams.get("text.usetex"):
+            # Strip out CreationDate betcase ghostscript doesn't obey
+            # SOURCE_DATE_EPOCH.  Note that in usetex mode, we *always* call
+            # gs_distill, even if ps.usedistiller is unset.
+            s_val = re.sub(b"(?<=\n%%CreationDate: ).*", b"", s_val)
+            b_val = re.sub(b"(?<=\n%%CreationDate: ).*", b"", b_val)
+
         assert s_val == b_val.replace(b'\r\n', b'\n')
 
 
