io_providers/env/
virtual_provider.rs

1use std::io;
2use std::path::{Path, PathBuf};
3use env;
4
5/// Provides access to a virtual environment, which can be configured independently from the
6/// local system.
7pub struct Virtual {
8    args: Vec<String>,
9    current_dir: PathBuf,
10}
11
12impl Virtual {
13    /// Creates a new virtual environment.
14    pub fn new() -> Virtual {
15        Virtual {
16            args: Vec::new(),
17            current_dir: PathBuf::from("/"),
18        }
19    }
20
21    /// Sets the arguments.
22    pub fn set_args(&mut self, args: Vec<String>) {
23        self.args = args;
24    }
25}
26
27impl env::Provider for Virtual {
28    fn args(&self) -> Vec<String> {
29        self.args.clone()
30    }
31
32    fn current_dir(&self) -> io::Result<PathBuf> {
33        Ok(self.current_dir.clone())
34    }
35
36    fn set_current_dir<P: AsRef<Path>>(&mut self, path: P) -> io::Result<()> {
37        self.current_dir = PathBuf::from(path.as_ref());
38        Ok(())
39    }
40}
41
42#[cfg(test)]
43#[allow(non_snake_case)]
44mod tests {
45    use std::path::{Path, PathBuf};
46    use super::Virtual;
47    use env::Provider;
48
49    #[test]
50    fn current_dir__default__returns_root() {
51        let provider = Virtual::new();
52        let result = provider.current_dir().unwrap();
53        assert_eq!(PathBuf::from("/"), result);
54    }
55
56    #[test]
57    fn current_dir__set_and_get__success() {
58        let mut provider = Virtual::new();
59        let path = Path::new("/foo/bar");
60
61        provider.set_current_dir(path).unwrap();
62        let result = provider.current_dir().unwrap();
63
64        assert_eq!(path, result.as_path());
65    }
66
67    #[test]
68    fn args__default__returns_empty() {
69        let provider = Virtual::new();
70        let result = provider.args();
71        assert_eq!(0, result.len());
72    }
73
74    #[test]
75    fn args__set_and_get__success() {
76        let mut provider = Virtual::new();
77        let args = vec!["app".to_string(), "arg1".to_string(), "arg2".to_string()];
78
79        provider.set_args(args.clone());
80        let result = provider.args();
81
82        assert_eq!(args, result);
83    }
84}
io_providers/env/virtual_provider.rs

io_providers/env/
virtual_provider.rs
