Add test for ip6zone codec's invalid case

Author: mhchia

tests/test_transforms.py

@@ -20,7 +20,7 @@
 
 # These test values were generated by running them
 # through the go implementation of multiaddr.
-# https://github.com/jbenet/multiaddr
+# https://github.com/multiformats/go-multiaddr
 ADDR_BYTES_MAP_STR_TEST_DATA = [
     (_names_to_protocols['ip4'], b'\x0a\x0b\x0c\x0d', '10.11.12.13'),
     (_names_to_protocols['ip6'],
@@ -148,6 +148,7 @@ def test_bytes_to_string_value_error(protocol_extension, bytes):
     (_names_to_protocols['onion'], 'timaq4ygg2iegci7:0'),
     (_names_to_protocols['onion'], 'timaq4ygg2iegci7:71234'),
     (_names_to_protocols['p2p'], '15230d52ebb89d85b02a284948203a'),
+    (_names_to_protocols['ip6zone'], ""),
 ])
 def test_codec_to_bytes_value_error(proto, address):
     # Codecs themselves may raise any exception type – it will then be converted
@@ -157,7 +158,8 @@ def test_codec_to_bytes_value_error(proto, address):
 
 
 @pytest.mark.parametrize("proto, buf", [
-    (_names_to_protocols['tcp'], b'\xff\xff\xff\xff')
+    (_names_to_protocols['tcp'], b'\xff\xff\xff\xff'),
+    (_names_to_protocols['ip6zone'], b""),
 ])
 def test_codec_to_string_value_error(proto, buf):
     # Codecs themselves may raise any exception type – it will then be converted