diff --git a/example.py b/example.py
new file mode 100644
index 0000000000000000000000000000000000000000..d26c40a62b5ac65a764e707968a8f286bcd01a02
--- /dev/null
+++ b/example.py
@@ -0,0 +1,16 @@
+def add(a, b):
+    return a + b
+
+
+def test_add():
+    assert add(2, 3) == 5
+    assert add('space', 'ship') == 'spaceship'
+
+
+def subtract(a, b):
+    return a + b  # <--- fix this in step 8
+
+
+# uncomment the following test in step 5
+#def test_subtract():
+#    assert subtract(2, 3) == -1