diff --git a/swarm_copy_tests/test_utils.py b/swarm_copy_tests/test_utils.py
index c978122..43579d8 100644
--- a/swarm_copy_tests/test_utils.py
+++ b/swarm_copy_tests/test_utils.py
@@ -4,12 +4,14 @@
 from pathlib import Path
 
 import pytest
+from httpx import AsyncClient
 
+from swarm_copy.schemas import KGMetadata
 from swarm_copy.utils import (
     RegionMeta,
     get_descendants_id,
     merge_chunk,
-    merge_fields,
+    merge_fields, get_file_from_KG, is_lnmc, get_kg_data,
 )
 
 
@@ -187,3 +189,322 @@ def test_RegionMeta_save_load(tmp_path: Path):
     assert RegionMeta_test.children_ids[1] == []
     assert RegionMeta_test.children_ids[2] == [1, 3]
     assert RegionMeta_test.children_ids[3] == []
+
+
+def test_RegionMeta_load_real_file(brain_region_json_path):
+    RegionMeta_test = RegionMeta.load_config(brain_region_json_path)
+
+    # check root.
+    assert RegionMeta_test.root_id == 997
+    assert RegionMeta_test.parent_id[997] == 0
+
+    # check some names / st_levels.
+    assert RegionMeta_test.name_[123] == "Koelliker-Fuse subnucleus"
+    assert RegionMeta_test.name_[78] == "middle cerebellar peduncle"
+    assert RegionMeta_test.st_level[55] == 10
+
+    # check some random parents / childrens.
+    assert RegionMeta_test.parent_id[12] == 165
+    assert RegionMeta_test.parent_id[78] == 752
+    assert RegionMeta_test.parent_id[700] == 88
+    assert RegionMeta_test.parent_id[900] == 840
+    assert RegionMeta_test.children_ids[12] == []
+    assert RegionMeta_test.children_ids[23] == []
+    assert RegionMeta_test.children_ids[670] == [2260827822, 3562104832]
+    assert RegionMeta_test.children_ids[31] == [1053, 179, 227, 39, 48, 572, 739]
+
+
+@pytest.mark.asyncio
+async def test_get_file_from_KG_errors(httpx_mock):
+    file_url = "http://fake_url.com"
+    file_name = "fake_file"
+    view_url = "http://fake_url_view.com"
+    token = "fake_token"
+    client = AsyncClient()
+
+    # first response from KG is not a json
+    httpx_mock.add_response(url=view_url, text="not a json")
+
+    with pytest.raises(ValueError) as not_json:
+        await get_file_from_KG(
+            file_url=file_url,
+            file_name=file_name,
+            view_url=view_url,
+            token=token,
+            httpx_client=client,
+        )
+    assert not_json.value.args[0] == "url_response did not return a Json."
+
+    # no file url found in the KG
+    httpx_mock.add_response(
+        url=view_url, json={"head": {"vars": ["file_url"]}, "results": {"bindings": []}}
+    )
+
+    with pytest.raises(IndexError) as not_found:
+        await get_file_from_KG(
+            file_url=file_url,
+            file_name=file_name,
+            view_url=view_url,
+            token=token,
+            httpx_client=client,
+        )
+    assert not_found.value.args[0] == "No file url was found."
+
+    httpx_mock.reset()
+    # no file found corresponding to file_url
+    test_file_url = "http://test_url.com"
+    json_response = {
+        "head": {"vars": ["file_url"]},
+        "results": {
+            "bindings": [{"file_url": {"type": "uri", "value": test_file_url}}]
+        },
+    }
+
+    httpx_mock.add_response(url=view_url, json=json_response)
+    httpx_mock.add_response(url=test_file_url, status_code=401)
+
+    with pytest.raises(ValueError) as not_found:
+        await get_file_from_KG(
+            file_url=file_url,
+            file_name=file_name,
+            view_url=view_url,
+            token=token,
+            httpx_client=client,
+        )
+    assert not_found.value.args[0] == "Could not find the file, status code : 401"
+
+    # Problem finding the file url
+    httpx_mock.add_response(url=view_url, status_code=401)
+
+    with pytest.raises(ValueError) as not_found:
+        await get_file_from_KG(
+            file_url=file_url,
+            file_name=file_name,
+            view_url=view_url,
+            token=token,
+            httpx_client=client,
+        )
+    assert not_found.value.args[0] == "Could not find the file url, status code : 401"
+
+
+@pytest.mark.asyncio
+async def test_get_file_from_KG(httpx_mock):
+    file_url = "http://fake_url"
+    file_name = "fake_file"
+    view_url = "http://fake_url"
+    token = "fake_token"
+    test_file_url = "http://test_url"
+    client = AsyncClient()
+
+    json_response_url = {
+        "head": {"vars": ["file_url"]},
+        "results": {
+            "bindings": [{"file_url": {"type": "uri", "value": test_file_url}}]
+        },
+    }
+    with open(
+        Path(__file__).parent / "data" / "KG_brain_regions_hierarchy_test.json"
+    ) as fh:
+        json_response_file = json.load(fh)
+
+    httpx_mock.add_response(url=view_url, json=json_response_url)
+    httpx_mock.add_response(url=test_file_url, json=json_response_file)
+
+    response = await get_file_from_KG(
+        file_url=file_url,
+        file_name=file_name,
+        view_url=view_url,
+        token=token,
+        httpx_client=client,
+    )
+
+    assert response == json_response_file
+
+
+@pytest.mark.asyncio
+async def test_get_kg_data_errors(httpx_mock):
+    url = "http://fake_url"
+    token = "fake_token"
+    client = AsyncClient()
+
+    # First failure: invalid object_id
+    with pytest.raises(ValueError) as invalid_object_id:
+        await get_kg_data(
+            object_id="invalid_object_id",
+            httpx_client=client,
+            url=url,
+            token=token,
+            preferred_format="preferred_format",
+        )
+
+    assert (
+        invalid_object_id.value.args[0]
+        == "The provided ID (invalid_object_id) is not valid."
+    )
+
+    # Second failure: Number of hits = 0
+    httpx_mock.add_response(url=url, json={"hits": {"hits": []}})
+
+    with pytest.raises(ValueError) as no_hits:
+        await get_kg_data(
+            object_id="https://object-id",
+            httpx_client=client,
+            url=url,
+            token=token,
+            preferred_format="preferred_format",
+        )
+
+    assert (
+        no_hits.value.args[0]
+        == "We did not find the object https://object-id you are asking"
+    )
+
+    # Third failure: Wrong object id
+    httpx_mock.add_response(
+        url=url, json={"hits": {"hits": [{"_source": {"@id": "wrong-object-id"}}]}}
+    )
+
+    with pytest.raises(ValueError) as wrong_object_id:
+        await get_kg_data(
+            object_id="https://object-id",
+            httpx_client=client,
+            url=url,
+            token=token,
+            preferred_format="preferred_format",
+        )
+
+    assert (
+        wrong_object_id.value.args[0]
+        == "We did not find the object https://object-id you are asking"
+    )
+
+
+@pytest.mark.httpx_mock(can_send_already_matched_responses=True)
+@pytest.mark.asyncio
+async def test_get_kg_data(httpx_mock):
+    url = "http://fake_url"
+    token = "fake_token"
+    client = AsyncClient()
+    preferred_format = "txt"
+    object_id = "https://object-id"
+
+    response_json = {
+        "hits": {
+            "hits": [
+                {
+                    "_source": {
+                        "@id": object_id,
+                        "distribution": [
+                            {
+                                "encodingFormat": f"application/{preferred_format}",
+                                "contentUrl": "http://content-url-txt",
+                            }
+                        ],
+                        "contributors": [
+                            {
+                                "@id": "https://www.grid.ac/institutes/grid.5333.6",
+                            }
+                        ],
+                        "brainRegion": {
+                            "@id": "http://api.brain-map.org/api/v2/data/Structure/252",
+                            "idLabel": (
+                                "http://api.brain-map.org/api/v2/data/Structure/252|Dorsal"
+                                " auditory area, layer 5"
+                            ),
+                            "identifier": (
+                                "http://api.brain-map.org/api/v2/data/Structure/252"
+                            ),
+                            "label": "Dorsal auditory area, layer 5",
+                        },
+                    }
+                }
+            ]
+        }
+    }
+    httpx_mock.add_response(
+        url=url,
+        json=response_json,
+    )
+
+    httpx_mock.add_response(
+        url="http://content-url-txt",
+        content=b"this is the txt content",
+    )
+
+    # Response with preferred format
+    object_content, metadata = await get_kg_data(
+        object_id="https://object-id",
+        httpx_client=client,
+        url=url,
+        token=token,
+        preferred_format=preferred_format,
+    )
+
+    assert isinstance(object_content, bytes)
+    assert isinstance(metadata, KGMetadata)
+    assert metadata.file_extension == "txt"
+    assert metadata.is_lnmc is True
+
+    # Response without preferred format
+    object_content, reader = await get_kg_data(
+        object_id="https://object-id",
+        httpx_client=client,
+        url=url,
+        token=token,
+        preferred_format="no_preferred_format_available",
+    )
+
+    assert isinstance(object_content, bytes)
+    assert isinstance(metadata, KGMetadata)
+    assert metadata.file_extension == "txt"
+    assert metadata.is_lnmc is True
+
+
+@pytest.mark.parametrize(
+    "contributors,expected_bool",
+    [
+        (
+            [
+                {
+                    "@id": "https://www.grid.ac/institutes/grid.5333.6",
+                    "@type": ["http://schema.org/Organization"],
+                    "label": "École Polytechnique Fédérale de Lausanne",
+                }
+            ],
+            True,
+        ),
+        (
+            [
+                {
+                    "@id": "https://bbp.epfl.ch/nexus/v1/realms/bbp/users/gevaert",
+                    "@type": ["http://schema.org/Person"],
+                    "affiliation": "École Polytechnique Fédérale de Lausanne",
+                }
+            ],
+            True,
+        ),
+        (
+            [
+                {},
+                {
+                    "@id": "https://bbp.epfl.ch/nexus/v1/realms/bbp/users/kanari",
+                    "@type": ["http://schema.org/Person"],
+                    "affiliation": "École Polytechnique Fédérale de Lausanne",
+                },
+            ],
+            True,
+        ),
+        (
+            [
+                {
+                    "@id": "wrong-id",
+                    "@type": ["http://schema.org/Person"],
+                    "affiliation": "Another school",
+                }
+            ],
+            False,
+        ),
+    ],
+)
+def test_is_lnmc(contributors, expected_bool):
+    assert is_lnmc(contributors) is expected_bool