find_mountpoint 1.0.3

find the mountpoint (or prefix, on Windows) for a provided path
Documentation 
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mod os;

#[cfg(all(unix, not(target_os = "macos")))]
pub use os::unix::*;
#[cfg(target_os = "macos")]
pub use os::macos::*;
#[cfg(windows)]
pub use os::windows::*;

#[derive(Debug)]
pub enum Error {
    Ffi(std::ffi::NulError),
    Io(std::io::Error),
    S(String),
}

impl From<std::ffi::NulError> for Error {
    fn from(err: std::ffi::NulError) -> Error {
        Error::Ffi(err)
    }
}

impl From<std::io::Error> for Error {
    fn from(err: std::io::Error) -> Error {
        Error::Io(err)
    }
}

impl From<String> for Error {
    fn from(err: String) -> Error {
        Error::S(err)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use std::path::Path;

    #[test]
    fn integration_basic() {
        let sample = Path::new("./Cargo.toml").canonicalize().unwrap();
        let result = find_mountpoint_pre_canonicalized(sample.as_path());
        #[cfg(unix)]
        assert_eq!(result.unwrap().to_str().unwrap(), "/");
        #[cfg(windows)]
        assert_eq!(result.unwrap().to_str().unwrap(), "\\\\?\\C:");
    }

    #[test]
    fn integration_basic_without_canonicalization() {
        let sample = Path::new("./Cargo.toml");
        let result = find_mountpoint(sample);
        #[cfg(unix)]
        assert_eq!(result.unwrap().to_str().unwrap(), "/");
        #[cfg(windows)]
        assert_eq!(result.unwrap().to_str().unwrap(), "\\\\?\\C:");
    }

    // only run this if you have a Boot Camp volume named energeia on your system.
    #[test]
    #[ignore]
    fn integration_another_fs() {
        let sample = Path::new("/Volumes/energeia/CONFIG.SYS");
        let result = find_mountpoint_pre_canonicalized(sample);
        assert_eq!(result.unwrap().to_str().unwrap(), "/Volumes/energeia");
    }

    #[test]
    #[should_panic]
    fn nonexistent_path() {
        let sample = Path::new("/Volumes/NOxSUCHxMOUNT/prj/Cargo.toml");
        find_mountpoint_pre_canonicalized(sample).unwrap();
    }

    #[test]
    #[should_panic]
    fn nonexistent_path_without_canonicalization() {
        let sample = Path::new("../vegan/porkchop/sandwiches");
        find_mountpoint(sample).unwrap();
    }
}