Add regression test for #742

(cherry picked from commit 885dd2a7437b946c975f2a37c9ccaecc1b91fc95)

tests/bugfixes/github/test_issue_742.py

@@ -0,0 +1,14 @@
+import system_tests
+
+
+class ThrowsWhenSubBoxLengthIsNotGood(metaclass=system_tests.CaseMeta):
+
+    url = "https://github.com/Exiv2/exiv2/issues/742"
+
+    filename = system_tests.path("$data_path/issue_742_poc")
+    commands = ["$exiv2 -pX $filename"]
+    stdout = [""]
+    stderr = ["""$exiv2_exception_message """ + filename + """:
+$kerCorruptedMetadata
+"""]
+    retval = [1]