tests: add fast module unit tests

Author: Bodzio-2

tests/cpp/test_fast.py

@@ -0,0 +1,23 @@
+import pytest
+import numpy as np
+
+from app.fast import system # type: ignore
+from app.fast import numpy_add # type: ignore
+
+
+def test_system():
+    assert 0 == system('ls -la')
+    assert 0 != system('sudo -n true')
+
+
+numpy_add_values = [
+    (np.array([2, 1, 4], dtype=np.double), np.sum([2, 1, 4])),
+    (np.array([3, 1, 2], dtype=np.double), np.sum([3, 1, 2])),
+    (np.array([10, 24, 11], dtype=np.double), np.sum([10, 24, 11])),
+    (np.array([99, 1, 22], dtype=np.double), np.sum([99, 1, 22]))
+]
+
+
+@pytest.mark.parametrize("array1,expected_result", numpy_add_values)
+def test_numpy_add(array1, expected_result):
+    assert numpy_add(array1) == expected_result