diff --git a/model_data/BoreholeClient.py b/model_data/BoreholeClient.py
index f268d6a7..4212d94b 100644
--- a/model_data/BoreholeClient.py
+++ b/model_data/BoreholeClient.py
@@ -45,7 +45,6 @@ class BoreholeClient:
         logger.info("Reading in borehole data")
         table = DBF(self.path)
         borehole_data = [x for x in tqdm(table, total=len(table))]
-
         self.data = borehole_data
 
     @staticmethod
diff --git a/model_data/tests/test_borehole_client.py b/model_data/tests/test_borehole_client.py
new file mode 100644
index 00000000..eb596ae4
--- /dev/null
+++ b/model_data/tests/test_borehole_client.py
@@ -0,0 +1,40 @@
+import pytest
+from model_data.BoreholeClient import BoreholeClient
+
+
+@pytest.fixture
+def mock_borehole_data(monkeypatch):
+    # Define the mock data to be returned by the read() method
+    mock_data = [
+        {
+            'X': 464343.0,
+            'Y': 415553.0
+        },
+        {
+            'X': 464341.0,
+            'Y': 415556.0
+        },
+        # Add more mock data entries here...
+    ]
+
+    # Monkeypatch the read() method to return the mock data
+    def mock_read(self):
+        return mock_data
+
+    # Apply the monkeypatch to the BoreholeClient class
+    monkeypatch.setattr(BoreholeClient, 'read', mock_read)
+
+
+@pytest.mark.usefixtures('mock_borehole_data')
+def test_distance_between_bng_coords():
+    # Create an instance of BoreholeClient
+    borehole_client = BoreholeClient("path/to/dbf/file")
+
+    # Test the distance calculation
+    distance_m, distance_km = borehole_client.distance_between_bng_coords(
+        x1_bng=123456, y1_bng=789012, x2_bng=464343.0, y2_bng=415553.0
+    )
+
+    # Perform assertions to verify the results
+    assert distance_m == 123.45
+    assert distance_km == 0.12345