diff --git a/tests/test_s01_sum_of_two_numbers.py b/tests/test_s01_sum_of_two_numbers.py
new file mode 100644
index 0000000..cda233b
--- /dev/null
+++ b/tests/test_s01_sum_of_two_numbers.py
@@ -0,0 +1,18 @@
+from hypothesis import given
+from hypothesis.strategies import integers
+from subprocess import Popen, PIPE
+
+
+# TODO: поменять на правильный вызов бинаря
+def sum_two_int64(x, y):
+    p = Popen(['python3', 'main.py'], stdout=PIPE, stdin=PIPE)
+    stdout, stderr = p.communicate(input=f'{x} {y}\n'.encode())
+    return int(stdout.strip())
+
+
+BOUND = 2**16
+
+
+@given(integers(min_value=-BOUND, max_value=BOUND-1), integers(min_value=-BOUND, max_value=BOUND-1))
+def test_sum(x, y):
+    assert x + y == sum_two_int64(x, y)