diff --git a/TestAggregateSalaries.py b/TestAggregateSalaries.py
new file mode 100644
index 0000000..1e0b2db
--- /dev/null
+++ b/TestAggregateSalaries.py
@@ -0,0 +1,40 @@
+import json
+import unittest
+from app import aggregate_salaries, MongoDB, Settings
+
+settings = Settings()
+
+with open(r'tests\samples.json', 'r') as f:
+    data = json.load(f)
+
+class TestAggregateSalaries(unittest.IsolatedAsyncioTestCase):
+    async def async_test(self, json_in, json_out, collection):
+        result = await aggregate_salaries(collection, **json_in)
+        self.assertEqual(json_out, result)
+
+    async def test_month(self):
+        client = MongoDB(str(settings.DB_URI))
+        db = client.client[settings.DATABASE_NAME]
+        collection = db[settings.COLLECTION_NAME]
+        json_in = data['month']['in']
+        json_out = data['month']['out']
+        await self.async_test(json_in, json_out, collection)
+
+    async def test_day(self):
+        client = MongoDB(str(settings.DB_URI))
+        db = client.client[settings.DATABASE_NAME]
+        collection = db[settings.COLLECTION_NAME]
+        json_in = data['day']['in']
+        json_out = data['day']['out']
+        await self.async_test(json_in, json_out, collection)
+
+    async def test_hour(self):
+        client = MongoDB(str(settings.DB_URI))
+        db = client.client[settings.DATABASE_NAME]
+        collection = db[settings.COLLECTION_NAME]
+        json_in = data['hour']['in']
+        json_out = data['hour']['out']
+        await self.async_test(json_in, json_out, collection)
+
+if __name__ == '__main__':
+    unittest.main()
\ No newline at end of file
diff --git a/tests/samples.json b/tests/samples.json
new file mode 100644
index 0000000..6f1814a
--- /dev/null
+++ b/tests/samples.json
@@ -0,0 +1,60 @@
+{
+    "month": {
+        "in":{
+            "dt_from": "2022-09-01T00:00:00",
+            "dt_upto": "2022-12-31T23:59:00",
+            "group_type": "month"
+         },
+        "out": {
+            "dataset": [5906586, 5515874, 5889803, 6092634],
+            "labels": ["2022-09-01T00:00:00", "2022-10-01T00:00:00", "2022-11-01T00:00:00", "2022-12-01T00:00:00"]
+        }        
+    },
+    "day": {
+        "in":{
+            "dt_from": "2022-10-01T00:00:00",
+            "dt_upto": "2022-11-30T23:59:00",
+            "group_type": "day"
+         },
+        "out": {
+            "dataset": [0, 0, 0, 195028, 190610, 193448, 203057, 208605, 191361, 186224, 181561, 195264, 213854, 194070,208372, 184966, 196745, 185221, 196197, 200647, 196755, 221695, 189114, 204853, 194652, 188096, 215141,
+            185000, 206936, 200164, 188238, 195279, 191601, 201722, 207361, 184391, 203336, 205045, 202717, 182251,
+            185631, 186703, 193604, 204879, 201341, 202654, 183856, 207001, 204274, 204119, 188486, 191392, 184199,
+            202045, 193454, 198738, 205226, 188764, 191233, 193167, 205334],
+            "labels": ["2022-10-01T00:00:00", "2022-10-02T00:00:00", "2022-10-03T00:00:00", "2022-10-04T00:00:00",
+           "2022-10-05T00:00:00", "2022-10-06T00:00:00", "2022-10-07T00:00:00", "2022-10-08T00:00:00",
+           "2022-10-09T00:00:00", "2022-10-10T00:00:00", "2022-10-11T00:00:00", "2022-10-12T00:00:00",
+           "2022-10-13T00:00:00", "2022-10-14T00:00:00", "2022-10-15T00:00:00", "2022-10-16T00:00:00",
+           "2022-10-17T00:00:00", "2022-10-18T00:00:00", "2022-10-19T00:00:00", "2022-10-20T00:00:00",
+           "2022-10-21T00:00:00", "2022-10-22T00:00:00", "2022-10-23T00:00:00", "2022-10-24T00:00:00",
+           "2022-10-25T00:00:00", "2022-10-26T00:00:00", "2022-10-27T00:00:00", "2022-10-28T00:00:00",
+           "2022-10-29T00:00:00", "2022-10-30T00:00:00", "2022-10-31T00:00:00", "2022-11-01T00:00:00",
+           "2022-11-02T00:00:00", "2022-11-03T00:00:00", "2022-11-04T00:00:00", "2022-11-05T00:00:00",
+           "2022-11-06T00:00:00", "2022-11-07T00:00:00", "2022-11-08T00:00:00", "2022-11-09T00:00:00",
+           "2022-11-10T00:00:00", "2022-11-11T00:00:00", "2022-11-12T00:00:00", "2022-11-13T00:00:00",
+           "2022-11-14T00:00:00", "2022-11-15T00:00:00", "2022-11-16T00:00:00", "2022-11-17T00:00:00",
+           "2022-11-18T00:00:00", "2022-11-19T00:00:00", "2022-11-20T00:00:00", "2022-11-21T00:00:00",
+           "2022-11-22T00:00:00", "2022-11-23T00:00:00", "2022-11-24T00:00:00", "2022-11-25T00:00:00",
+           "2022-11-26T00:00:00", "2022-11-27T00:00:00", "2022-11-28T00:00:00", "2022-11-29T00:00:00",
+           "2022-11-30T00:00:00"]
+        }
+    },
+    "hour": {
+        "in":{
+            "dt_from": "2022-02-01T00:00:00",
+            "dt_upto": "2022-02-02T00:00:00",
+            "group_type": "hour"
+         },
+        "out": {
+            "dataset": [8177, 8407, 4868, 7706, 8353, 7143, 6062, 11800, 4077, 8820, 4788, 11045, 13048, 2729, 4038, 9888,
+        7490, 11644, 11232, 12177, 2741, 5341, 8730, 4718, 0],
+            "labels": ["2022-02-01T00:00:00", "2022-02-01T01:00:00", "2022-02-01T02:00:00", "2022-02-01T03:00:00",
+       "2022-02-01T04:00:00", "2022-02-01T05:00:00", "2022-02-01T06:00:00", "2022-02-01T07:00:00",
+       "2022-02-01T08:00:00", "2022-02-01T09:00:00", "2022-02-01T10:00:00", "2022-02-01T11:00:00",
+       "2022-02-01T12:00:00", "2022-02-01T13:00:00", "2022-02-01T14:00:00", "2022-02-01T15:00:00",
+       "2022-02-01T16:00:00", "2022-02-01T17:00:00", "2022-02-01T18:00:00", "2022-02-01T19:00:00",
+       "2022-02-01T20:00:00", "2022-02-01T21:00:00", "2022-02-01T22:00:00", "2022-02-01T23:00:00",
+       "2022-02-02T00:00:00"]
+    }
+    }
+}
\ No newline at end of file