UPDATE: Dump of initial files

base/src/test/test_error_propagation.rs

@@ -0,0 +1,39 @@
+#![allow(clippy::unwrap_used)]
+
+use crate::test::util::new_empty_model;
+use crate::types::Cell;
+
+#[test]
+fn test_simple_error_propagation() {
+    let mut model = new_empty_model();
+    model._set("A1", "=1/0");
+    model._set("A2", "=2+A1");
+    model._set("A3", "=C2+A2");
+    model.evaluate();
+    match model._get_cell("Sheet1!A3") {
+        Cell::CellFormulaError { o, .. } => {
+            assert_eq!(o, "Sheet1!A1");
+        }
+        _ => panic!("Unreachable"),
+    }
+}
+
+#[test]
+fn test_simple_errors() {
+    let mut model = new_empty_model();
+    model._set("A1", "#CALC!");
+    model._set("A2", "#SPILL!");
+    model._set("A3", "#OTHER!");
+
+    model._set("B1", "=ISERROR(A1)");
+    model._set("B2", "=ISERROR(A2)");
+    model._set("B3", "=ISERROR(A3)");
+    model.evaluate();
+
+    assert_eq!(model._get_text("A1"), "#CALC!");
+    assert_eq!(model._get_text("A2"), "#SPILL!");
+    assert_eq!(model._get_text("A3"), "#OTHER!");
+    assert_eq!(model._get_text("B1"), "TRUE");
+    assert_eq!(model._get_text("B2"), "TRUE");
+    assert_eq!(model._get_text("B3"), "FALSE");
+}