diff --git a/tests/test_elements_worker/test_classifications.py b/tests/test_elements_worker/test_classifications.py
index 002baf8206540b3bc6e5dd3816079ed0a004f15e..2532c3591f0927ca2ed5d3b1c066bb9c3b04a41c 100644
--- a/tests/test_elements_worker/test_classifications.py
+++ b/tests/test_elements_worker/test_classifications.py
@@ -501,3 +501,373 @@ def test_create_classification_duplicate(responses, mock_elements_worker):
 
     # Classification has NOT been created
     assert mock_elements_worker.report.report_data["elements"] == {}
+
+
+def test_create_classifications_wrong_element(mock_elements_worker):
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=None,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "element shouldn't be null and should be an Element or CachedElement"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element="not element type",
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "element shouldn't be null and should be an Element or CachedElement"
+    )
+
+
+def test_create_classifications_wrong_classifications(mock_elements_worker):
+    elt = Element({"id": "12341234-1234-1234-1234-123412341234"})
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=None,
+        )
+    assert (
+        str(e.value) == "classifications shouldn't be null and should be of type list"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=1234,
+        )
+    assert (
+        str(e.value) == "classifications shouldn't be null and should be of type list"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: class_name shouldn't be null and should be of type str"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": None,
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: class_name shouldn't be null and should be of type str"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": 1234,
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: class_name shouldn't be null and should be of type str"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: confidence shouldn't be null and should be a float in [0..1] range"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": None,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: confidence shouldn't be null and should be a float in [0..1] range"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": "wrong confidence",
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: confidence shouldn't be null and should be a float in [0..1] range"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": 0,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: confidence shouldn't be null and should be a float in [0..1] range"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": 2.00,
+                    "high_confidence": False,
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: confidence shouldn't be null and should be a float in [0..1] range"
+    )
+
+    with pytest.raises(AssertionError) as e:
+        mock_elements_worker.create_classifications(
+            element=elt,
+            classifications=[
+                {
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                },
+                {
+                    "class_name": "landscape",
+                    "confidence": 0.25,
+                    "high_confidence": "wrong high_confidence",
+                },
+            ],
+        )
+    assert (
+        str(e.value)
+        == "Classification at index 1 in classifications: high_confidence should be of type bool"
+    )
+
+
+def test_create_classifications_api_error(responses, mock_elements_worker):
+    responses.add(
+        responses.POST,
+        "http://testserver/api/v1/classification/bulk/",
+        status=500,
+    )
+    elt = Element({"id": "12341234-1234-1234-1234-123412341234"})
+    classes = [
+        {
+            "class_name": "portrait",
+            "confidence": 0.75,
+            "high_confidence": False,
+        },
+        {
+            "class_name": "landscape",
+            "confidence": 0.25,
+            "high_confidence": False,
+        },
+    ]
+
+    with pytest.raises(ErrorResponse):
+        mock_elements_worker.create_classifications(
+            element=elt, classifications=classes
+        )
+
+    assert len(responses.calls) == len(BASE_API_CALLS) + 5
+    assert [
+        (call.request.method, call.request.url) for call in responses.calls
+    ] == BASE_API_CALLS + [
+        # We retry 5 times the API call
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+    ]
+
+
+def test_create_classifications(responses, mock_elements_worker_with_cache):
+    elt = CachedElement.create(id="12341234-1234-1234-1234-123412341234", type="thing")
+    classes = [
+        {
+            "class_name": "portrait",
+            "confidence": 0.75,
+            "high_confidence": False,
+        },
+        {
+            "class_name": "landscape",
+            "confidence": 0.25,
+            "high_confidence": False,
+        },
+    ]
+
+    responses.add(
+        responses.POST,
+        "http://testserver/api/v1/classification/bulk/",
+        status=200,
+        json={
+            "parent": str(elt.id),
+            "worker_version": "12341234-1234-1234-1234-123412341234",
+            "classifications": [
+                {
+                    "id": "00000000-0000-0000-0000-000000000000",
+                    "class_name": "portrait",
+                    "confidence": 0.75,
+                    "high_confidence": False,
+                    "state": "pending",
+                },
+                {
+                    "id": "11111111-1111-1111-1111-111111111111",
+                    "class_name": "landscape",
+                    "confidence": 0.25,
+                    "high_confidence": False,
+                    "state": "pending",
+                },
+            ],
+        },
+    )
+
+    mock_elements_worker_with_cache.create_classifications(
+        element=elt, classifications=classes
+    )
+
+    assert len(responses.calls) == len(BASE_API_CALLS) + 1
+    assert [
+        (call.request.method, call.request.url) for call in responses.calls
+    ] == BASE_API_CALLS + [
+        ("POST", "http://testserver/api/v1/classification/bulk/"),
+    ]
+
+    assert json.loads(responses.calls[-1].request.body) == {
+        "parent": str(elt.id),
+        "worker_version": "12341234-1234-1234-1234-123412341234",
+        "classifications": classes,
+    }
+
+    # Check that created classifications were properly stored in SQLite cache
+    assert list(CachedClassification.select()) == [
+        CachedClassification(
+            id=UUID("00000000-0000-0000-0000-000000000000"),
+            element_id=UUID(elt.id),
+            class_name="portrait",
+            confidence=0.75,
+            state="pending",
+            worker_version_id=UUID("12341234-1234-1234-1234-123412341234"),
+        ),
+        CachedClassification(
+            id=UUID("11111111-1111-1111-1111-111111111111"),
+            element_id=UUID(elt.id),
+            class_name="landscape",
+            confidence=0.25,
+            state="pending",
+            worker_version_id=UUID("12341234-1234-1234-1234-123412341234"),
+        ),
+    ]