envcast 1.0.0

Short, clear description of what the project does
Documentation 
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use std::env;
use std::fs::File;
use std::io::prelude::Read;
use std::path::PathBuf;

pub fn get_dotenv_file_content() -> Option<String> {
    let file_path = match env::var("DOTENV_CONFIG_PATH") {
        Ok(env_value) => PathBuf::from(env_value),
        Err(_) => env::current_dir().unwrap().join(".env"),
    };
    match File::open(file_path) {
        Ok(mut file) => {
            let mut content = String::new();
            file.read_to_string(&mut content).ok()?;
            Some(content.replace("\r\n", "\n"))
        }
        Err(..) => None,
    }
}

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

    #[test]
    fn test_get_dotenv_file_content_by_envvar_path() {
        env::set_var("DOTENV_CONFIG_PATH", "../tests/data/.env");

        let content = get_dotenv_file_content();
        assert!(content.is_some());
        let content = content.unwrap();
        assert_eq!(content.len(), 2272);

        env::remove_var("DOTENV_CONFIG_PATH");
    }

    #[test]
    fn test_get_dotenv_file_content_in_cwd() {
        fs::copy("../tests/data/.env", ".env").expect("Failed to copy file");

        let content = get_dotenv_file_content();
        fs::remove_file(".env").expect("Failed to delete temp file");

        assert!(content.is_some());
        let content = content.unwrap();
        assert_eq!(content.len(), 2272);
    }

    #[test]
    fn test_get_dotenv_file_content_is_none() {
        let content = get_dotenv_file_content();
        assert!(content.is_none());
    }
}