diff --git a/tests/test_test.py b/tests/test_test.py
new file mode 100644
index 0000000..2e0658b
--- /dev/null
+++ b/tests/test_test.py
@@ -0,0 +1,6 @@
+def foo(x):
+    return x + 1
+
+
+def test_answer():
+    assert foo(3) == 4