UPDATE: Dump of initial files

base/src/expressions/test.rs

@@ -0,0 +1,21 @@
+use super::*;
+
+#[test]
+fn test_error_codes() {
+    let errors = vec![
+        Error::REF,
+        Error::NAME,
+        Error::VALUE,
+        Error::DIV,
+        Error::NA,
+        Error::NUM,
+        Error::ERROR,
+    ];
+    for (i, error) in errors.iter().enumerate() {
+        let s = format!("{}", error);
+        let index = error_index(s.clone()).unwrap();
+        assert_eq!(i as i32, index);
+        let s2 = error_string(i as usize).unwrap();
+        assert_eq!(s, s2);
+    }
+}