test: add simple unit test for new proxy code (WIP)

Author: karel-rehor

influxdb_client_3/__init__.py

@@ -121,7 +121,7 @@ def __init__(
                                          possible.
         :key str proxy: Set this to configure the http proxy to be used (ex. http://localhost:3128)
         :key str proxy_headers: A dictionary containing headers that will be sent to the proxy. Could be used for proxy
-                                authentication.
+                                authentication. (Applies to Write API only)
         :key int connection_pool_maxsize: Number of connections to save that can be reused by urllib3.
                                           Defaults to "multiprocessing.cpu_count() * 5".
         :key urllib3.util.retry.Retry retries: Set the default retry strategy that is used for all HTTP requests

tests/test_query.py

@@ -150,3 +150,19 @@ def test_query_with_parameters(self):
         )
 
         mock_do_get.assert_called_once_with(expected_ticket, ANY)
+
+    def test_query_proxy_base_client(self):
+        test_proxy = "http://testproxy:5432"
+        client = InfluxDBClient3(
+            host="http://localhost:8443",
+            token="my-token",
+            org="my-org",
+            database="my-database",
+            proxy=test_proxy
+        )
+
+        assert client._query_api._proxy == test_proxy
+        assert ('grpc.http_proxy', test_proxy) in\
+               client._query_api._flight_client_options.get('generic_options')
+
+