make temperature proxy host and port configurable in the configuration tab

tests/test_TemperatureProxyClient.py

@@ -22,7 +22,7 @@ class TestTemperatureProxyClient(unittest.TestCase):
         return io.BytesIO(json.dumps(payload).encode("utf-8"))
 
     @patch("damaris.gui.TemperatureProxyClient.urlopen")
-    def test_get_history_uses_fixed_endpoint_and_converts_readings(self, mock_urlopen):
+    def test_get_history_uses_default_endpoint_and_converts_readings(self, mock_urlopen):
         mock_urlopen.return_value = self.response({
             "readings": [
                 {"t": 101.5, "pv": 293.15},
@@ -35,13 +35,25 @@ class TestTemperatureProxyClient(unittest.TestCase):
         args, kwargs = mock_urlopen.call_args
         parsed_url = urlparse(args[0])
         self.assertEqual(parsed_url.scheme, "http")
-        self.assertEqual(parsed_url.netloc, "localhost:8000")
+        self.assertEqual(parsed_url.netloc, "127.0.0.1:18007")
         self.assertEqual(parsed_url.path, "/v1/readings")
         self.assertEqual(parse_qs(parsed_url.query), {"start": ["100.0"], "end": ["110.0"]})
         self.assertEqual(kwargs, {"timeout": TemperatureProxyClient.TIMEOUT})
         self.assertEqual(result.x, [1.5, 4.0])
         self.assertEqual(result.y, [293.15, 294.25])
 
+    @patch("damaris.gui.TemperatureProxyClient.urlopen")
+    def test_custom_host_and_port_are_used(self, mock_urlopen):
+        mock_urlopen.return_value = self.response({"readings": [{"t": 101.0, "pv": 293.0}]})
+
+        client = TemperatureProxyClient(host="proxy.example.org", port=9000)
+        client.get_history(100.0, 110.0)
+
+        args, _ = mock_urlopen.call_args
+        parsed_url = urlparse(args[0])
+        self.assertEqual(parsed_url.netloc, "proxy.example.org:9000")
+        self.assertEqual(parsed_url.path, "/v1/readings")
+
     @patch("damaris.gui.TemperatureProxyClient.urlopen")
     def test_empty_readings_return_none(self, mock_urlopen):
         mock_urlopen.return_value = self.response({"readings": []})
@@ -62,7 +74,7 @@ class TestTemperatureProxyClient(unittest.TestCase):
             OSError("connection refused"),
             TimeoutError("request timed out"),
             http.client.BadStatusLine("not an HTTP response"),
-            HTTPError(TemperatureProxyClient.URL, 500, "server error", {}, None),
+            HTTPError(self.client.url, 500, "server error", {}, None),
         )
         for failure in failures:
             with self.subTest(failure=failure):