adjust according to PR comments

tests/test_client_session.py

@@ -709,7 +709,7 @@ async def test_requote_redirect_url_default_disable() -> None:
 
 
 @pytest.mark.parametrize(
-    "base_url,url",
+    ("base_url", "url"),
     [
         (None, "http://example.com/test"),
         ("http://example.com", "/test"),
@@ -718,20 +718,20 @@ async def test_requote_redirect_url_default_disable() -> None:
         (URL("http://example.com/"), "/test"),
     ],
 )
-async def test_build_url(base_url, url) -> None:
-    session = ClientSession(base_url)
+async def test_build_url(create_session, base_url, url) -> None:
+    session = await create_session(base_url)
     assert session._build_url(url) == URL("http://example.com/test")
 
 
-async def test_build_url_raises() -> None:
-    session = ClientSession("http://example.com")
+async def test_build_url_raises(create_session) -> None:
+    session = await create_session("http://example.com")
     with pytest.raises(ValueError):
         session._build_url("test")
 
 
-async def test_request_uses_base_url_when_url_is_str() -> None:
+async def test_request_uses_base_url_when_url_is_str(create_session) -> None:
     request_class = mock.MagicMock()
-    session = ClientSession("http://example.com", request_class=request_class)
+    session = await create_session("http://example.com", request_class=request_class)
     with contextlib.suppress(Exception):
         await session.get("/test")
 
@@ -740,9 +740,9 @@ async def test_request_uses_base_url_when_url_is_str() -> None:
     assert url == URL("http://example.com/test")
 
 
-async def test_request_not_uses_base_url_when_url_is_URL() -> None:
+async def test_request_not_uses_base_url_when_url_is_URL(create_session) -> None:
     request_class = mock.MagicMock()
-    session = ClientSession("http://example.com", request_class=request_class)
+    session = await create_session("http://example.com", request_class=request_class)
     with contextlib.suppress(Exception):
         await session.get(URL("http://sample.com"))