Add reversible test

Author: pbashyal-nmdp

tests/test_pyard.py

@@ -205,3 +205,9 @@ def test_is_null(self):
         self.assertFalse(
             self.ard.is_null(allele), msg="MACs shouldn't be called as Nulls"
         )
+
+    def test_mac_is_reversible(self):
+        mac_code = "A*68:AJEBX"
+        expanded_mac = self.ard.expand_mac(mac_code)
+        lookup_mac = self.ard.lookup_mac(expanded_mac)
+        self.assertEqual(mac_code, lookup_mac)