diff --git a/project_name/feature_sign.py b/project_name/feature_sign.py
new file mode 100644
index 0000000..06d4fdd
--- /dev/null
+++ b/project_name/feature_sign.py
@@ -0,0 +1,2 @@
+def sign_func(value: float) -> float:
+    return -1 if value < 0 else 1
diff --git a/project_name/tests/test_sign.py b/project_name/tests/test_sign.py
new file mode 100644
index 0000000..6fc37e4
--- /dev/null
+++ b/project_name/tests/test_sign.py
@@ -0,0 +1,23 @@
+import pytest
+import numpy as np
+
+from ..feature_sign import sign_func
+
+
+def test_simple_sign_func():
+    assert sign_func(-100000.346) == -1
+
+
+@pytest.mark.parametrize(
+    "value, expected",
+    [
+        (0, 1),
+        (10000.0, 1),
+        (-345236.78, -1)
+    ]
+)
+
+def test_sign_func(value: float, expected: float):
+    sign_val = sign_func(value)
+    expected = np.sign(value)
+    assert expected==sign_val