Function check_start_index

arrow-string/src/substring.rs:970–974

()

    // tests for the utf-8 validation checking
    #[test]
    fn check_start_index() {
        let array = StringArray::from(vec![Some("E=mc²"), Some("ascii")]);
        let err = substring(&array, -1, None).unwrap_err().to_string();
        assert!(err.contains("invalid utf-8 boundary"));
    }

    #[test]
    fn check_length() {