diff --git a/maths/test_factorial.py b/maths/test_factorial.py
new file mode 100644
index 000000000000..d80d88add745
--- /dev/null
+++ b/maths/test_factorial.py
@@ -0,0 +1,37 @@
+# /// script
+# requires-python = ">=3.13"
+# dependencies = [
+#     "pytest",
+# ]
+# ///
+
+import pytest
+
+from maths.factorial import factorial, factorial_recursive
+
+
+@pytest.mark.parametrize("function", [factorial, factorial_recursive])
+def test_zero(function):
+    assert function(0) == 1
+
+
+@pytest.mark.parametrize("function", [factorial, factorial_recursive])
+def test_positive_integers(function):
+    assert function(1) == 1
+    assert function(5) == 120
+    assert function(7) == 5040
+
+
+@pytest.mark.parametrize("function", [factorial, factorial_recursive])
+def test_large_number(function):
+    assert function(10) == 3628800
+
+
+@pytest.mark.parametrize("function", [factorial, factorial_recursive])
+def test_negative_number(function):
+    with pytest.raises(ValueError):
+        function(-3)
+
+
+if __name__ == "__main__":
+    pytest.main(["-v", __file__])
diff --git a/web_programming/current_stock_price.py b/web_programming/current_stock_price.py
index 16b0b6772a9c..531da949ea50 100644
--- a/web_programming/current_stock_price.py
+++ b/web_programming/current_stock_price.py
@@ -23,7 +23,7 @@
 def stock_price(symbol: str = "AAPL") -> str:
     """
     >>> stock_price("EEEE")
-    '- '
+    'No <fin-streamer> tag with the specified data-testid attribute found.'
     >>> isinstance(float(stock_price("GOOG")),float)
     True
     """