SuccinctRoles.is_delegated_role() add test case

Add a test case when there is a bin name with the desired prefix, but
which cannot be cast to a hexadecimal number.

Signed-off-by: Martin Vrachev <mvrachev@vmware.com>

Author: Martin Vrachev

tests/test_api.py

@@ -750,7 +750,14 @@ def test_is_delegated_role(self) -> None:
 
     def test_is_delegated_role_in_succinct_roles(self) -> None:
         succinct_roles = SuccinctRoles([], 1, 5, "bin")
-        false_role_name_examples = ["foo", "bin-", "bin-s", "bin-20", "bin-100"]
+        false_role_name_examples = [
+            "foo",
+            "bin-",
+            "bin-s",
+            "bin-0t",
+            "bin-20",
+            "bin-100",
+        ]
         for role_name in false_role_name_examples:
             msg = f"Error for {role_name}"
             self.assertFalse(succinct_roles.is_delegated_role(role_name), msg)