diff --git a/test/integration/metadata_test.py b/test/integration/metadata_test.py
index 83c06bb..8eea2e4 100644
--- a/test/integration/metadata_test.py
+++ b/test/integration/metadata_test.py
@@ -118,14 +118,14 @@ def test_list_objects(connection):
 
 @pytest.mark.metadata
 def test_list_object_sizes(connection):
-    expected = [709780]
-    actual = [
+    sizes = [
         db_object["MEM_OBJECT_SIZE"]
         for db_object in connection.meta.list_object_sizes(
             object_name_pattern="USERS%", object_type_pattern="TABLE"
         )
     ]
-    assert actual == expected
+    do_all_objects_have_a_size = all(map(lambda size: size != 0, sizes))
+    assert do_all_objects_have_a_size
 
 
 @pytest.mark.metadata
diff --git a/test/integration/proxy_test.py b/test/integration/proxy_test.py
new file mode 100644
index 0000000..cc542d2
--- /dev/null
+++ b/test/integration/proxy_test.py
@@ -0,0 +1,69 @@
+import pytest
+import pyexasol
+import subprocess
+import platform
+
+
+@pytest.fixture
+def proxy_port():
+    yield 8562
+
+
+@pytest.fixture
+def proxy(proxy_port):
+    os_specific_flags = ["--reuse"] if platform.system() == "Linux" else []
+    command = ["pproxy", "-l", f"http://:{proxy_port}/"] + os_specific_flags
+    pproxy = subprocess.Popen(command)
+
+    yield f"http://127.0.0.1:{proxy_port}"
+
+    pproxy.kill()
+
+
+@pytest.fixture
+def proxy_user():
+    yield "johndoe"
+
+
+@pytest.fixture
+def proxy_password():
+    yield "JohndoesPassword"
+
+
+@pytest.fixture
+def proxy_with_auth(proxy_port, proxy_user, proxy_password):
+    os_specific_flags = ["--reuse"] if platform.system() == "Linux" else []
+    command = [
+        "pproxy",
+        "-l",
+        f"http://:{proxy_port}/#{proxy_user}:{proxy_password}",
+    ] + os_specific_flags
+    pproxy = subprocess.Popen(command)
+
+    yield f"http://{proxy_user}:{proxy_password}@localhost:{proxy_port}"
+
+    pproxy.kill()
+
+
+@pytest.mark.configuration
+def test_connect_through_proxy(dsn, user, password, schema, proxy):
+    with pyexasol.connect(
+        dsn=dsn, user=user, password=password, schema=schema, http_proxy=proxy
+    ) as connection:
+        result = connection.execute("SELECT 1;")
+        expected = 1
+        actual = result.fetchval()
+        assert expected == actual
+
+
+@pytest.mark.configuration
+def test_connect_through_proxy_with_authentication(
+    dsn, user, password, schema, proxy_with_auth
+):
+    with pyexasol.connect(
+        dsn=dsn, user=user, password=password, schema=schema, http_proxy=proxy_with_auth
+    ) as connection:
+        result = connection.execute("SELECT 1;")
+        expected = 1
+        actual = result.fetchval()
+        assert expected == actual