src/librustc_lexer/src/tests.rs

#[cfg(test)]
mod tests {
    use crate::*;

    fn check_raw_str(s: &str, expected_hashes: u16, expected_err: Option<RawStrError>) {
        let s = &format!("r{}", s);
        let mut cursor = Cursor::new(s);
        cursor.bump();
        let (n_hashes, err) = cursor.raw_double_quoted_string(0);
        assert_eq!(n_hashes, expected_hashes);
        assert_eq!(err, expected_err);
    }

    #[test]
    fn test_naked_raw_str() {
        check_raw_str(r#""abc""#, 0, None);
    }

    #[test]
    fn test_raw_no_start() {
        check_raw_str(r##""abc"#"##, 0, None);
    }

    #[test]
    fn test_too_many_terminators() {
        // this error is handled in the parser later
        check_raw_str(r###"#"abc"##"###, 1, None);
    }

    #[test]
    fn test_unterminated() {
        check_raw_str(
            r#"#"abc"#,
            1,
            Some(RawStrError::NoTerminator {
                expected: 1,
                found: 0,
                possible_terminator_offset: None,
            }),
        );
        check_raw_str(
            r###"##"abc"#"###,
            2,
            Some(RawStrError::NoTerminator {
                expected: 2,
                found: 1,
                possible_terminator_offset: Some(7),
            }),
        );
        // We're looking for "# not just any #
        check_raw_str(
            r###"##"abc#"###,
            2,
            Some(RawStrError::NoTerminator {
                expected: 2,
                found: 0,
                possible_terminator_offset: None,
            }),
        )
    }

    #[test]
    fn test_invalid_start() {
        check_raw_str(r##"#~"abc"#"##, 1, Some(RawStrError::InvalidStarter { bad_char: '~' }));
    }

    #[test]
    fn test_unterminated_no_pound() {
        // https://github.com/rust-lang/rust/issues/70677
        check_raw_str(
            r#"""#,
            0,
            Some(RawStrError::NoTerminator {
                expected: 0,
                found: 0,
                possible_terminator_offset: None,
            }),
        );
    }

    #[test]
    fn test_valid_shebang() {
        // https://github.com/rust-lang/rust/issues/70528
        let input = "#!/usr/bin/rustrun\nlet x = 5;";
        assert_eq!(strip_shebang(input), Some(18));
    }

    #[test]
    fn test_invalid_shebang_valid_rust_syntax() {
        // https://github.com/rust-lang/rust/issues/70528
        let input = "#!    [bad_attribute]";
        assert_eq!(strip_shebang(input), None);
    }

    #[test]
    fn test_shebang_second_line() {
        // Because shebangs are interpreted by the kernel, they must be on the first line
        let input = "\n#!/bin/bash";
        assert_eq!(strip_shebang(input), None);
    }

    #[test]
    fn test_shebang_space() {
        let input = "#!    /bin/bash";
        assert_eq!(strip_shebang(input), Some(input.len()));
    }

    #[test]
    fn test_shebang_empty_shebang() {
        let input = "#!    \n[attribute(foo)]";
        assert_eq!(strip_shebang(input), None);
    }

    #[test]
    fn test_invalid_shebang_comment() {
        let input = "#!//bin/ami/a/comment\n[";
        assert_eq!(strip_shebang(input), None)
    }

    #[test]
    fn test_invalid_shebang_another_comment() {
        let input = "#!/*bin/ami/a/comment*/\n[attribute";
        assert_eq!(strip_shebang(input), None)
    }

    #[test]
    fn test_shebang_valid_rust_after() {
        let input = "#!/*bin/ami/a/comment*/\npub fn main() {}";
        assert_eq!(strip_shebang(input), Some(23))
    }

    #[test]
    fn test_shebang_followed_by_attrib() {
        let input = "#!/bin/rust-scripts\n#![allow_unused(true)]";
        assert_eq!(strip_shebang(input), Some(19));
    }
}