num-format 0.4.4

A Rust crate for producing string-representations of numbers, formatted according to international standards
Documentation 
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#[cfg(not(feature = "std"))]
#[test]
fn test_errors_capacity() {
    use num_format::utils::SeparatorStr;
    use num_format::{CustomFormat, ErrorKind};

    let s = "123456789";
    match SeparatorStr::new(s) {
        Ok(_) => panic!(),
        Err(e) => match e.kind() {
            ErrorKind::Capacity { len, cap } => {
                assert_eq!(*len, 9);
                assert_eq!(*cap, 8);
            }
            _ => panic!(),
        },
    }
    match CustomFormat::builder().separator(s).build() {
        Ok(_) => panic!(),
        Err(e) => match e.kind() {
            ErrorKind::Capacity { len, cap } => {
                assert_eq!(*len, 9);
                assert_eq!(*cap, 8);
            }
            _ => panic!(),
        },
    }
}

#[cfg(feature = "std")]
#[test]
fn test_errors_capacity() {
    use num_format::utils::SeparatorStr;
    use num_format::CustomFormat;

    let s = "123456789";
    match SeparatorStr::new(s) {
        Ok(_) => panic!(),
        Err(e) => assert_eq!(
            "Attempted to write input of length 9 bytes into a buffer with capacity 8 bytes.",
            &e.to_string(),
        ),
    }
    match CustomFormat::builder().separator(s).build() {
        Ok(_) => panic!(),
        Err(e) => assert_eq!(
            "Attempted to write input of length 9 bytes into a buffer with capacity 8 bytes.",
            &e.to_string(),
        ),
    }
}

#[cfg(all(feature = "with-system-locale", any(unix, windows)))]
#[test]
fn test_errors_interior_null_byte() {
    use std::str;

    use num_format::SystemLocale;

    let b = b"Hello\0World";
    let s = str::from_utf8(&b[..]).unwrap();
    match SystemLocale::from_name(s) {
        Ok(_) => panic!(),
        Err(e) => assert_eq!(
            "Locale name Hello\u{0}World contains an interior nul byte, which is not allowed.",
            &e.to_string()
        ),
    }
}

#[cfg(not(feature = "std"))]
#[test]
fn test_errors_parse_locale() {
    use num_format::{ErrorKind, Locale};

    let s = "123456789";
    match Locale::from_name(s) {
        Ok(_) => panic!(),
        Err(e) => match e.kind() {
            ErrorKind::ParseLocale(array_string) => assert_eq!(s, array_string.as_str()),
            _ => panic!(),
        },
    }
}

#[cfg(feature = "std")]
#[test]
fn test_errors_parse_locale() {
    use num_format::Locale;

    let s = "123456789";
    match Locale::from_name(s) {
        Ok(_) => panic!(),
        Err(e) => assert_eq!(
            "Failed to parse 123456789 into a valid locale.",
            &e.to_string(),
        ),
    }
}

#[cfg(all(feature = "with-system-locale", any(unix, windows)))]
#[test]
fn test_errors_parse_system_locale() {
    use num_format::SystemLocale;

    let s = "123456789";
    match SystemLocale::from_name(s) {
        Ok(_) => panic!(),
        Err(e) => assert_eq!(
            "Failed to parse 123456789 into a valid locale.",
            &e.to_string(),
        ),
    }
}