temp-env

Set environment variables temporarily.

This crate is useful for testing with different environment variables that should not interfere.

This code started as a small test helper written by @fabian-braun and @nbaztec and published by @fabian-braun on StackOverflow. @vmx found it useful and took the time to make it a proper crate.

Example

temp_env::with_var("MY_ENV_VAR", Some("production"), || {
    // Run some code where `MY_ENV_VAR` set to `"production"`.
});


temp_env::with_vars(
    vec![
        ("FIRST_VAR", Some("Hello")),
        ("SECOND_VAR", Some("World!")),
    ],
    || {
        // Run some code where `FIRST_VAR` is set to `"Hello"` and `SECOND_VAR` is set to
        // `"World!"`.
    }
);

temp_env::with_vars(
    vec![
        ("FIRST_VAR", Some("Hello")),
        ("SECOND_VAR", None),
    ],
    || {
        // Run some code where `FIRST_VAR` is set to `"Hello"` and `SECOND_VAR` is unset (even if
        // it was set before)
    }
);

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE) or https://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)

at your option.