add unit test for apply-patch ipv6 regex

tests/ip_config_input/ipv6_interfaces.json

@@ -0,0 +1,5 @@
+{
+    "INTERFACE|Ethernet12|FC00::11/126":{
+    "NULL" : "NULL"
+    }
+}

tests/ip_config_input/patch_ipv6.test

@@ -0,0 +1,6 @@
+[
+    {
+        "path": "/INTERFACE/Ethernet12|FC00::1~1126", 
+        "op": "remove"
+    }
+]

tests/ip_config_test.py

@@ -7,6 +7,10 @@
 import config.main as config
 import show.main as show
 from utilities_common.db import Db
+from .mock_tables import dbconnector
+
+test_path = os.path.dirname(os.path.abspath(__file__))
+mock_db_path = os.path.join(test_path, "ip_config_input")
 
 ERROR_MSG = "Error: IP address is not valid"
 
@@ -157,7 +161,22 @@ def test_add_del_interface_shortened_ipv6_with_leading_zeros(self):
         assert result.exit_code != 0
         assert ('Ethernet68', '3000::1/64') not in db.cfgdb.get_table('INTERFACE')
 
+    def test_remove_interface_case_sensitive_mock_ipv6_w_apply_patch(self):
+        dbconnector.dedicated_dbs['CONFIG_DB'] = os.path.join(mock_db_path, 'ipv6_interfaces')
+        db = Db()
+        runner = CliRunner()
+
+        assert ('Ethernet12', 'FC00::11/126') in db.cfgdb.get_table('INTERFACE')
+
+        # config apply-patch patch
+        ipv6_patch_file = os.path.join(mock_db_path, 'patch_ipv6.test')
+        result = runner.invoke(config.config.commands["apply-patch"], [ipv6_patch_file], obj=db)
+        print(result.exit_code, result.output)
+        assert "converted ipv6 address to lowercase fc00::1~1126 with prefix /INTERFACE/Ethernet12| in value: /INTERFACE/Ethernet12|FC00::1~1126" in result.output
+
+
     @classmethod
     def teardown_class(cls):
         os.environ['UTILITIES_UNIT_TESTING'] = "0"
+        dbconnector.dedicated_dbs['CONFIG_DB'] = None
         print("TEARDOWN")