diff --git a/tests/Program_test.py b/tests/Program_test.py
new file mode 100644
index 0000000..52d07a5
--- /dev/null
+++ b/tests/Program_test.py
@@ -0,0 +1,46 @@
+import unittest
+from datetime import datetime
+
+from new.program import Program
+
+
+class ProgramTest(unittest.TestCase):
+
+    def setUp(self) -> None:
+        self._program = Program()
+
+    @staticmethod
+    def _to_date(value: str):
+        return datetime.strptime(value, '%d.%m.%Y')
+
+    def test_sqrt(self):
+        """
+        Function to test the sqrt function of program, which uses the sqrt function of math package
+        :return:
+        """
+        print(f'[ {__name__}.test_sqrt ]')
+
+        result = self._program.sqrt(9.0)
+        self.assertEqual(result, 3.0)
+
+        result = self._program.sqrt(144.0)
+        self.assertEqual(result, 12.0)
+
+    def test_date(self):
+        """
+        Function to test the date function of program, which calculates the difference between two dates
+        :return:
+        """
+        print(f'[ {__name__}.test_date ]')
+
+        result = self._program.date(self._to_date('01.01.2020'), self._to_date('31.12.2020'))
+        self.assertEqual(result, 365)
+
+        result = self._program.date(self._to_date('31.12.2020'), self._to_date('01.01.2020'))
+        self.assertEqual(result, 365)
+
+        result = self._program.date(self._to_date('01.12.2020'), self._to_date('31.12.2020'))
+        self.assertEqual(result, 30)
+
+        result = self._program.date(self._to_date('01.01.2000'), self._to_date('31.12.2020'))
+        self.assertEqual(result, 7670)
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/tester.py b/tests/tester.py
new file mode 100644
index 0000000..67255fa
--- /dev/null
+++ b/tests/tester.py
@@ -0,0 +1,23 @@
+import unittest
+
+from tests.Program_test import ProgramTest
+
+
+class Tester:
+
+    def __init__(self):
+        self._suite = unittest.TestSuite()
+
+    def create(self):
+        self._suite.addTest(ProgramTest('test_sqrt'))
+        self._suite.addTest(ProgramTest('test_date'))
+
+    def start(self):
+        runner = unittest.TextTestRunner()
+        runner.run(self._suite)
+
+
+if __name__ == '__main__':
+    tester = Tester()
+    tester.create()
+    tester.start()