diff --git a/features/communication.py b/features/communication.py
index a915ecd..73f9b7d 100644
--- a/features/communication.py
+++ b/features/communication.py
@@ -15,3 +15,8 @@ def get_call_data(usernames: List) -> pd.DataFrame:
     with db_engine.connect() as connection:
         df_calls = pd.read_sql(query_calls.statement, connection)
     return df_calls
+
+
+def enumerate_contacts(comm_df: pd.DataFrame) -> pd.DataFrame:
+    # Calculate frequencies and return in descending order.
+    return comm_df
diff --git a/test/test_communication.py b/test/test_communication.py
new file mode 100644
index 0000000..12263fd
--- /dev/null
+++ b/test/test_communication.py
@@ -0,0 +1,39 @@
+import unittest
+
+import numpy as np
+import pandas as pd
+from numpy.random import default_rng
+
+from features.communication import enumerate_contacts, get_call_data
+
+rng = default_rng()
+
+
+class CallsFeatures(unittest.TestCase):
+    def setUp(self):
+        call_rows = 10
+        callers = np.concatenate((
+                np.repeat("caller1", 4),
+                np.repeat("caller2", 3),
+                np.repeat("caller3", 2),
+                np.repeat("caller4", 1)), axis=None)
+        rng.shuffle(callers)
+        self.calls = pd.DataFrame({
+            "id": np.linspace(0, call_rows - 1, num=call_rows, dtype="u4") + 100,
+            "_id": np.linspace(0, call_rows - 1, num=call_rows, dtype="u4"),
+            "timestamp": np.sort(rng.integers(1612169903000, 1614556703000, size=call_rows)),
+            "device_id": "device1",
+           "call_type": rng.integers(1, 3, size=call_rows),
+           "call_duration": rng.integers(0, 600, size=call_rows),
+            "trace": callers,
+            "participant_id": 29
+        })
+        print(self.calls)
+
+    def test_get_calls_data(self):
+        calls_from_db = get_call_data(["nokia_0000003"])
+        self.assertIsNotNone(calls_from_db)
+
+    def test_enumeration(self):
+        enumerate_contacts(self.calls)
+        #Enumerate manually and compare
diff --git a/test/test_database.py b/test/test_database.py
index 6abd8ce..992dea5 100644
--- a/test/test_database.py
+++ b/test/test_database.py
@@ -4,7 +4,6 @@ from sqlalchemy import create_engine
 from sqlalchemy.orm import sessionmaker
 
 from config.models import LightSensor, Participant
-from features.communication import get_call_data
 from setup import db_uri
 
 
@@ -30,7 +29,3 @@ class DatabaseConnection(unittest.TestCase):
     def test_get_light_data(self):
         light_0 = self.session.query(Participant).join(LightSensor).first()
         self.assertIsNotNone(light_0)
-
-    def test_get_calls_data(self):
-        calls = get_call_data(["nokia_0000003"])
-        self.assertIsNotNone(calls)