update: adds unit test for CELL, INFO, N and SHEETS

base/src/test/test_cell_info_n_sheets

@@ -0,0 +1,35 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+
+#[test]
+fn arguments() {
+    let mut model = new_empty_model();
+    model._set("A1", "=CELL("address",A1)");
+    model._set("A2", "=CELL()");
+
+    model._set("A3", "=INFO("system")");
+    model._set("A4", "=INFO()");
+
+    model._set("A5", "=N(TRUE)");
+    model._set("A6", "=N()");
+    model._set("A7", "=N(1, 2)");
+
+    model._set("A8", "=SHEETS()");
+    model._set("A9", "=SHEETS(1)");
+
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), *"$A$1");
+    assert_eq!(model._get_text("A2"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A3"), *"#N/IMPL!");
+    assert_eq!(model._get_text("A4"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A5"), *"1");
+    assert_eq!(model._get_text("A6"), *"#ERROR!");
+    assert_eq!(model._get_text("A7"), *"#ERROR!");
+
+    assert_eq!(model._get_text("A8"), *"1");
+    assert_eq!(model._get_text("A9"), *"#N/IMPL!");
+}