diff --git a/machine-learning/app/test_main.py b/machine-learning/app/test_main.py
index d9d1455bd1..3a5f62c3b2 100644
--- a/machine-learning/app/test_main.py
+++ b/machine-learning/app/test_main.py
@@ -7,6 +7,7 @@ from types import SimpleNamespace
 from typing import Any, Callable
 from unittest import mock
 
+from app.models.session import ort_add_batch_dim, ort_has_batch_dim, ort_squeeze_outputs
 import cv2
 import numpy as np
 import onnxruntime as ort
@@ -734,3 +735,69 @@ class TestEndpoints:
             assert expected_face["boundingBox"] == actual_face["boundingBox"]
             assert np.allclose(expected_face["embedding"], actual_face["embedding"])
             assert np.allclose(expected_face["score"], actual_face["score"])
+
+
+class TestSessionUtils:
+    def test_ort_has_batch_dim(self, mocker: MockerFixture) -> None:
+        mock_session = mocker.Mock(spec=ort.InferenceSession)
+        mock_session.get_inputs.return_value = [SimpleNamespace(shape=["batch", 3, 224, 224], name="input.1")]
+
+        assert ort_has_batch_dim(mock_session) is True
+
+    def test_ort_has_no_batch_dim(self, mocker: MockerFixture) -> None:
+        mock_session = mocker.Mock(spec=ort.InferenceSession)
+        mock_session.get_inputs.return_value = [SimpleNamespace(shape=[1, 3, 224, 224], name="input.1")]
+
+        assert ort_has_batch_dim(mock_session) is False
+
+    def test_ort_squeeze_outputs(self, mocker: MockerFixture) -> None:
+        mock_session = mocker.Mock(spec=ort.InferenceSession)
+        mock_session.run.return_value = [np.random.rand(1, 3, 224, 224).astype(np.float32)]
+
+        ort_squeeze_outputs(mock_session)
+        out = mock_session.run(["output"], {"input": np.random.rand(1, 3, 224, 224).astype(np.float32)})
+
+        assert len(out) == 1
+        assert out[0].shape == (3, 224, 224)
+
+    def test_ort_add_batch_dim(self, mocker: MockerFixture) -> None:
+        mock_proto = mocker.Mock()
+        mock_proto.graph.input = [
+            SimpleNamespace(name="input", type=mock.Mock(tensor_type=SimpleNamespace(shape=SimpleNamespace())))
+        ]
+        mock_proto.graph.output = [
+            SimpleNamespace(name="output", type=SimpleNamespace(tensor_type=SimpleNamespace(shape=SimpleNamespace())))
+        ]
+        mock_proto.graph.input[0].type.tensor_type.shape.dim = [
+            SimpleNamespace(dim_value=3),
+            SimpleNamespace(dim_value=224),
+            SimpleNamespace(dim_value=224),
+        ]
+        mock_proto.graph.output[0].type.tensor_type.shape.dim = [
+            SimpleNamespace(dim_value=3),
+            SimpleNamespace(dim_value=224),
+            SimpleNamespace(dim_value=224),
+        ]
+
+        mock_load = mocker.patch("app.models.session.onnx.load")
+        mock_load.return_value = mock_proto
+
+        mock_update_dims = mocker.patch("app.models.session.update_inputs_outputs_dims")
+        mock_updated = mocker.Mock()
+        mock_update_dims.return_value = mock_updated
+
+        mock_infer_shapes = mocker.patch("app.models.session.infer_shapes")
+        mock_inferred = mocker.Mock()
+        mock_infer_shapes.return_value = mock_inferred
+
+        mock_save = mocker.patch("app.models.session.onnx.save")
+
+        input_path, output_path = Path("input.onnx"), Path("output.onnx")
+        ort_add_batch_dim(input_path, output_path)
+
+        mock_load.assert_called_once_with(input_path)
+        mock_save.assert_called_once_with(mock_inferred, output_path)
+        mock_update_dims.assert_called_once_with(mock_proto, mock.ANY, mock.ANY)
+        assert mock_update_dims.call_args_list == [
+            mock.call(mock_proto, {"input": ["batch", 224, 224]}, {"output": ["batch", 224, 224]})
+        ]