UPDATE: Dump of initial files

base/src/test/test_fn_if.rs

@@ -0,0 +1,36 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn fn_if_arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=IF()");
+    model._set("A2", "=IF(1, 2, 3, 4)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"#ERROR!");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+}
+
+#[test]
+fn fn_if_2_args() {
+    let mut model = new_empty_model();
+    model._set("A1", "=IF(2 > 3, TRUE)");
+    model.evaluate();
+    assert_eq!(model._get_text("A1"), *"FALSE");
+}
+
+#[test]
+fn fn_if_missing_args() {
+    let mut model = new_empty_model();
+    model._set("A1", "=IF(2 > 3, TRUE, )");
+    model._set("A2", "=IF(2 > 3, , 5)");
+    model._set("A3", "=IF(2 < 3, , 5)");
+
+    model.evaluate();
+
+    // assert_eq!(model._get_text("A1"), *"0");
+    assert_eq!(model._get_text("A2"), *"5");
+    assert_eq!(model._get_text("A3"), *"0");
+}