Test for https://github.com/Exiv2/exiv2/issues/1821

(cherry picked from commit d54e3e5ea54bf0420378ed86f846fede622532da)

test/data/issue_1821_poc.xmp

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+<?xpacket?>
+<xxm xmlns:potoﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾋﾏﾁｸﾁﾁﾁﾀﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁﾁID="3"/>

tests/bugfixes/github/test_issue_1821.py

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+# -*- coding: utf-8 -*-
+
+from system_tests import CaseMeta, path
+import unittest
+
+# Issue #1821 is a memory leak caused by buggy third-party
+# code in the xmpsdk sub-directory, so it isn't easy for us to fix.
+# This test will fail when run with an ASAN build.
+@unittest.skip("Skipping test until #1821 is fixed")
+
+class MemoryLeakAddBinding(metaclass=CaseMeta):
+    """
+    Regression test for the bug described in:
+    https://github.com/Exiv2/exiv2/issues/1821
+    """
+    url = "https://github.com/Exiv2/exiv2/issues/1821"
+
+    filename = path("$data_path/issue_1821_poc.xmp")
+    commands = ["$exiv2 -q $filename"]
+    stdout = ["""File name       : $filename
+File size       : 163 Bytes
+MIME type       : application/rdf+xml
+Image size      : 0 x 0
+"""]
+    stderr = ["""$filename: No Exif data found in the file
+"""]
+    retval = [253]