tests: make test_facture_pdf oblivious to formatting (#85632)

tests/test_factures_avoir.py

@@ -221,9 +221,12 @@ def test_facture_pdf(app):
     )
 
     def helper(root):
+        def simplify(s):
+            return '\n'.join(map(str.strip, s.splitlines()))
+
         tag = root.tag.split('}')[-1]
         if len(root) == 0:
-            return [tag, root.text or '']
+            return [tag, simplify(root.text or '')]
         else:
             return [tag] + [helper(node) for node in root]