(add) unittest

+diff --git a/test b/test
+new file mode 100644
+index 0000000..9daeafb
+--- /dev/null
++++ b/test
+@@ -0,0 +1 @@
++test

+diff --git a/test b/test
+index 9daeafb..90e5276 100644
+--- a/test
++++ b/test
+@@ -1 +1 @@
+-test
++tes

+# Copyright 2020-present Tae Hwan Jung
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import json
+import requests
+import unittest
+
+class CitiesTestCase(unittest.TestCase):
+    endpoint='http://127.0.0.1:5000'
+    headers = {'Content-Type': 'application/json; charset=utf-8'}
+
+    def test_index(self):
+        response = requests.get(f"{self.endpoint}/", headers=self.headers)
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            json.loads(response.text),
+            {
+                "hello": "world",
+            }
+        )
+
+    def test_tokenizer(self):
+        response = requests.post(
+            f"{self.endpoint}/tokenizer",
+            headers=self.headers,
+            data=json.dumps(
+                dict(
+                    code="hello world!"
+                )
+            )
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            json.loads(response.text),
+            {
+                "tokens": [
+                    "hello",
+                    "Ġworld",
+                    "!"
+                ]
+            }
+        )
+
+    def test_added(self):
+        response = requests.post(
+            f"{self.endpoint}/added",
+            headers=self.headers,
+            data=json.dumps(
+                dict(
+                    idx=0,
+                    added=['test'],
+                    deleted=[],
+                )
+            )
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            json.loads(response.text),
+            {'idx': 0, 'message': ['Test method .']}
+        )
+
+    def test_added(self):
+        response = requests.post(
+            f"{self.endpoint}/diff",
+            headers=self.headers,
+            data=json.dumps(
+                dict(
+                    idx=0,
+                    added=['tes'],
+                    deleted=['test'],
+                )
+            )
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(
+            json.loads(response.text),
+            {'idx': 0, 'message': ['Fix typo']}
+        )
+
+
+def suite():
+    suties = unittest.TestSuite()
+    suties.addTests(unittest.makeSuite(CitiesTestCase))
+    return suties
\ No newline at end of file