Add exiv2 extract thumb to stdout (#1934): test

tests/bugfixes/github/test_pr_1979.py

@@ -0,0 +1,24 @@
+# -*- coding: utf-8 -*-
+
+import system_tests
+from system_tests import CaseMeta, path, CopyTmpFiles, check_no_ASAN_UBSAN_errors
+
+@CopyTmpFiles("$data_path/issue_1934_poc1.exv")
+class TestExiv2ExtractThumbnailToStdout(metaclass=CaseMeta):
+    """
+    Regression test for 'extracting a thumbnail to stdout' bug described in:
+    https://github.com/Exiv2/exiv2/issues/1934
+    """
+    url = "https://github.com/Exiv2/exiv2/issues/1934"
+
+    filename1 = path("$tmp_path/issue_1934_poc1.exv")
+    filename2 = path("$tmp_path/issue_1934_poc1-thumb.jpg")
+    filename3 = path("$data_path/issue_1934_poc1-thumb.jpg")
+    commands = ["$exiv2 --force --extract t- $filename1 > $filename2",
+                "cmp $filename2 $filename3"
+               ]
+    stderr = [""]*2
+    retval = [0]*2
+
+    compare_stdout = check_no_ASAN_UBSAN_errors
+