diff --git a/tests/partitionedjobs/conftest.py b/tests/partitionedjobs/conftest.py
index 3911ce96..b7992ec1 100644
--- a/tests/partitionedjobs/conftest.py
+++ b/tests/partitionedjobs/conftest.py
@@ -1,6 +1,6 @@
 import collections
 import re
-from typing import Dict, List, Tuple
+from typing import Dict, Iterable, List, Tuple
 
 import pytest
 import requests
@@ -81,10 +81,11 @@ def get_job_data(self, user_id, job_id) -> DummyBatchJobData:
             raise JobNotFoundException(job_id=job_id)
         return self.jobs[user_id, job_id]
 
-    def setup_basic_requests_mocks(self):
+    def setup_basic_requests_mocks(self, collections: Iterable[str] = ("S2",)):
         # Basic collections
-        self.requests_mock.get(self.backend_url + "/collections", json={"collections": [{"id": "S2"}]})
-        self.requests_mock.get(self.backend_url + "/collections/S2", json={"id": "S2"})
+        for cid in collections:
+            self.requests_mock.get(self.backend_url + "/collections", json={"collections": [{"id": cid}]})
+            self.requests_mock.get(self.backend_url + f"/collections/{cid}", json={"id": cid})
         # Batch job handling: list jobs
         self.requests_mock.get(self.backend_url + "/jobs", json=self._handle_get_jobs)
         # Batch job handling: create job
diff --git a/tests/partitionedjobs/test_api.py b/tests/partitionedjobs/test_api.py
index 64f949c6..dfc8b941 100644
--- a/tests/partitionedjobs/test_api.py
+++ b/tests/partitionedjobs/test_api.py
@@ -44,13 +44,22 @@ def __init__(self, date: str):
 
 @pytest.fixture
 def dummy1(backend1, requests_mock) -> DummyBackend:
-    # TODO: rename this fixture to dummy_backed1
+    # TODO: rename this fixture to dummy_backed1 for clarity
     dummy = DummyBackend(requests_mock=requests_mock, backend_url=backend1, job_id_template="1-jb-{i}")
     dummy.setup_basic_requests_mocks()
     dummy.register_user(bearer_token=TEST_USER_BEARER_TOKEN, user_id=TEST_USER)
     return dummy
 
 
+@pytest.fixture
+def dummy2(backend2, requests_mock) -> DummyBackend:
+    # TODO: rename this fixture to dummy_backed2 for clarity
+    dummy = DummyBackend(requests_mock=requests_mock, backend_url=backend2, job_id_template="2-jb-{i}")
+    dummy.setup_basic_requests_mocks(collections=["S22"])
+    dummy.register_user(bearer_token=TEST_USER_BEARER_TOKEN, user_id=TEST_USER)
+    return dummy
+
+
 class TestFlimsyBatchJobSplitting:
     now = _Now("2022-01-19T12:34:56Z")
 
@@ -613,6 +622,7 @@ def test_job_results_basic(self, flask_app, api100, dummy1):
     # TODO: more/full TileGridSplitter batch job tests
 
 
+@pytest.mark.usefixtures("dummy1", "dummy2")
 class TestCrossBackendSplitting:
     now = _Now("2022-01-19T12:34:56Z")