diff --git a/tests/test_elements_worker/test_elements.py b/tests/test_elements_worker/test_elements.py
index 0d5d18ccb91bf47883bd41d36024d0275fda7af6..46a606306bd0be3004c69e863903f824c5b995ae 100644
--- a/tests/test_elements_worker/test_elements.py
+++ b/tests/test_elements_worker/test_elements.py
@@ -271,10 +271,9 @@ def test_database_arg_cache_missing_version_table(
 
 
 def test_load_corpus_classes_api_error(responses, mock_elements_worker):
-    mock_elements_worker.corpus_id = "12341234-1234-1234-1234-123412341234"
     responses.add(
         responses.GET,
-        f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+        "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         status=500,
     )
 
@@ -291,33 +290,32 @@ def test_load_corpus_classes_api_error(responses, mock_elements_worker):
         # We do 5 retries
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
     ]
     assert not mock_elements_worker.classes
 
 
 def test_load_corpus_classes(responses, mock_elements_worker):
-    mock_elements_worker.corpus_id = "12341234-1234-1234-1234-123412341234"
     responses.add(
         responses.GET,
-        f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+        "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         status=200,
         json={
             "count": 3,
@@ -348,11 +346,11 @@ def test_load_corpus_classes(responses, mock_elements_worker):
     ] == BASE_API_CALLS + [
         (
             "GET",
-            f"http://testserver/api/v1/corpus/{mock_elements_worker.corpus_id}/classes/",
+            "http://testserver/api/v1/corpus/11111111-1111-1111-1111-111111111111/classes/",
         ),
     ]
     assert mock_elements_worker.classes == {
-        "12341234-1234-1234-1234-123412341234": {
+        "11111111-1111-1111-1111-111111111111": {
             "good": "0000",
             "average": "1111",
             "bad": "2222",
diff --git a/tests/test_elements_worker/test_entities.py b/tests/test_elements_worker/test_entities.py
index 41e53644834137a116f1248c60418a72421a30cb..84963d796675ff02a2090c3f99fdbe0c2eed7937 100644
--- a/tests/test_elements_worker/test_entities.py
+++ b/tests/test_elements_worker/test_entities.py
@@ -94,6 +94,7 @@ def test_create_entity_wrong_corpus(monkeypatch, mock_elements_worker):
     elt = Element({"id": "12341234-1234-1234-1234-123412341234"})
 
     # Triggering an error on metas param, not giving corpus should work since
+    # ARKINDEX_CORPUS_ID environment variable is set on mock_elements_worker
     with pytest.raises(AssertionError) as e:
         mock_elements_worker.create_entity(
             element=elt,