diff --git a/applications/visualizer/backend/tests/test_connections.py b/applications/visualizer/backend/tests/test_connections.py
new file mode 100644
index 00000000..3b2ac1ac
--- /dev/null
+++ b/applications/visualizer/backend/tests/test_connections.py
@@ -0,0 +1,29 @@
+from ninja.testing import TestAsyncClient
+import pytest
+from model_bakery import baker
+
+
+from api.api import api as celegans_api
+from api.models import Connection
+from .utils import flat_dict, generate_instance
+
+
+# Some test data
+connections = [
+    {"id": "1", "dataset": {"id": "ds3", "name": "Dr. Seuss"}},
+]
+
+
+@pytest.fixture(scope="module")
+def django_db_setup(django_db_setup, django_db_blocker):
+    with django_db_blocker.unblock():
+        generate_instance(Connection, connections)
+
+
+@pytest.mark.django_db
+def test__fk_creation():
+    o = Connection.objects.get(id=1)
+
+    assert o.dataset
+    assert o.dataset.id == "ds3"
+    assert o.dataset.name == "Dr. Seuss"
diff --git a/applications/visualizer/backend/tests/test_datasets.py b/applications/visualizer/backend/tests/test_datasets.py
index 90780d49..65adb162 100644
--- a/applications/visualizer/backend/tests/test_datasets.py
+++ b/applications/visualizer/backend/tests/test_datasets.py
@@ -1,10 +1,10 @@
 from ninja.testing import TestAsyncClient
 import pytest
-from model_bakery import baker
 
 
 from api.api import api as celegans_api
 from api.models import Dataset
+from .utils import generate_instance
 
 
 # Some test data
@@ -24,14 +24,6 @@
 ]
 
 
-# Setup the db for this module with some data
-# @pytest.fixture(scope="module")
-# def django_db_setup(django_db_setup, django_db_blocker):
-#     with django_db_blocker.unblock():
-#         for dataset in datasets:
-#             Dataset.objects.create(**dataset)
-
-
 # Setup the db for this module with some data
 # Data are baked with "baker", it allows to create dummy values automatically
 # and also to specify some fields. It is used here to "fill" the fields which are
@@ -39,8 +31,7 @@
 @pytest.fixture(scope="module")
 def django_db_setup(django_db_setup, django_db_blocker):
     with django_db_blocker.unblock():
-        for dataset in datasets:
-            baker.make(Dataset, **dataset)
+        generate_instance(Dataset, datasets)
 
 
 # Fixture to access the test client in all test functions
diff --git a/applications/visualizer/backend/tests/utils.py b/applications/visualizer/backend/tests/utils.py
new file mode 100644
index 00000000..6363e9ce
--- /dev/null
+++ b/applications/visualizer/backend/tests/utils.py
@@ -0,0 +1,18 @@
+from model_bakery import baker
+
+
+def flat_dict(d):
+    res = {}
+    for key, value in d.items():
+        if isinstance(value, dict):
+            subdict = flat_dict(value)
+            for subk, subv in subdict.items():
+                res[f"{key}__{subk}"] = subv
+        else:
+            res[key] = value
+    return res
+
+
+def generate_instance(cls, instance_list):
+    for instance in instance_list:
+        baker.make(cls, **flat_dict(instance))