tests if adds or preserves the trailing slash

Author: HTSagara

tests/slack_sdk/web/test_web_client.py

@@ -229,3 +229,11 @@ def test_user_auth_blocks(self):
             user_auth_blocks=[DividerBlock(), DividerBlock()],
         )
         self.assertIsNone(new_message.get("error"))
+
+    def test_base_url_appends_trailing_slash_issue_15141(self):
+        client = self.client
+        self.assertEqual(client.base_url, "http://localhost:8888/")
+
+    def test_base_url_preserves_trailing_slash_issue_15141(self):
+        client = WebClient(base_url="http://localhost:8888/")
+        self.assertEqual(client.base_url, "http://localhost:8888/")