diff --git a/test/pyadpt-57.py b/test/pyadpt-57.py
new file mode 100755
index 0000000..370d0a6
--- /dev/null
+++ b/test/pyadpt-57.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# This test is related to jira issue PYADPT-57 - key_mistrusted
+# When key_mistrusted on own key (that has a private), a key revocation is being performed
+# So, this test just proves the revocation by showing fpr before and after key_mistrusted()
+
+"""
+>>> alice = pEp.Identity("alice@peptest.org", "23")
+>>> pEp.myself(alice)
+>>> alice.fpr
+>>> alice.key_mistrusted()
+>>> pEp.myself(alice)
+>>> alice.fpr
+"""
+
+import  pEp;
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()