UPDATE: Dump of initial files

base/src/test/test_fn_product.rs

@@ -0,0 +1,15 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn test_fn_product_arguments() {
+    let mut model = new_empty_model();
+
+    // Incorrect number of arguments
+    model._set("A1", "=PRODUCT()");
+
+    model.evaluate();
+    // Error (Incorrect number of arguments)
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+}