Simplify browser session bootstrap

tests/test_costco_pipeline.py

@@ -411,6 +411,25 @@ class CostcoPipelineTests(unittest.TestCase):
             ]
 
             with mock.patch.object(
+                scrape_costco,
+                "load_config",
+                return_value={
+                    "client_id": "4900eb1f-0c10-4bd9-99c3-c59e6c1ecebf",
+                    "client_identifier": "481b1aec-aa3b-454b-b81b-48187e28f205",
+                },
+            ), mock.patch.object(
+                scrape_costco,
+                "find_firefox_profile_dir",
+                return_value=Path("/tmp/profile"),
+            ), mock.patch.object(
+                scrape_costco,
+                "load_costco_browser_headers",
+                return_value={
+                    "costco-x-authorization": "Bearer header.payload.signature",
+                    "costco-x-wcs-clientId": "4900eb1f-0c10-4bd9-99c3-c59e6c1ecebf",
+                    "client-identifier": "481b1aec-aa3b-454b-b81b-48187e28f205",
+                },
+            ), mock.patch.object(
                 scrape_costco, "build_session", return_value=object()
             ), mock.patch.object(
                 scrape_costco,