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diff --git a/budget/tests.py b/budget/tests.py
index 7ce503c2dd97ba78597f6ff6e4393132753573f6..721c607a01d0b704a0b5f91e2ee612fbc1745380 100644
--- a/budget/tests.py
+++ b/budget/tests.py
@@ -1,3 +1,18 @@
+from datetime import date
+
 from django.test import TestCase
 
-# Create your tests here.
+from .utils import prev_month_range
+
+
+class BudgetTestCase(TestCase):
+    def test_prev_month_range(self):
+        self.assertEqual(
+            prev_month_range(1, 2025), (date(2024, 12, 1), date(2024, 12, 31))
+        )
+        self.assertEqual(
+            prev_month_range(2, 2025), (date(2025, 1, 1), date(2025, 1, 31))
+        )
+        self.assertEqual(
+            prev_month_range(12, 2025), (date(2025, 11, 1), date(2025, 11, 30))
+        )