Add uuid in im1 name

Author: AnnaMastori

lib/matplotlib/tests/test_compare_images.py

@@ -1,6 +1,6 @@
 from pathlib import Path
 import shutil
-
+import uuid
 import pytest
 from pytest import approx
 
@@ -58,7 +58,8 @@ def test_image_comparison_expect_rms(im1, im2, tol, expect_rms):
     # Copy both "baseline" and "test" image to result_dir, so that 1)
     # compare_images writes the diff to result_dir, rather than to the source
     # tree and 2) the baseline image doesn't appear missing to triage_tests.py.
-    result_im1 = make_test_filename(result_dir / im1, "expected")
+    uid = str(uuid.uuid4())
+    result_im1 = make_test_filename(result_dir / (uid + im1), "expected")
     shutil.copyfile(baseline_dir / im1, result_im1)
     result_im2 = result_dir / im1
     shutil.copyfile(baseline_dir / im2, result_im2)