notes/
env.rs

1use std::env;
2use std::env::VarError;
3
4#[cfg(test)]
5use mockall::automock;
6
7#[cfg_attr(test, automock)]
8pub trait Env {
9    fn get(&self, key: &str) -> Result<String, VarError>;
10}
11
12pub struct EnvImpl;
13
14impl EnvImpl {
15    pub fn new() -> Self {
16        EnvImpl {}
17    }
18}
19
20impl Default for EnvImpl {
21    fn default() -> Self {
22        EnvImpl::new()
23    }
24}
25
26impl Env for EnvImpl {
27    fn get(&self, key: &str) -> Result<String, VarError> {
28        env::var(key)
29    }
30}
31
32#[cfg(test)]
33mod tests {
34    use super::*;
35
36    #[test]
37    fn should_return_value() {
38        let env = EnvImpl::new();
39        assert!(env.get("HOME").unwrap().contains('/'))
40    }
41
42    #[test]
43    fn should_not_return_value() {
44        let env = EnvImpl::new();
45        assert!(env.get("NON_EXISTING_VAR").is_err())
46    }
47}
notes/env.rs

notes/
env.rs
