Rust tests can be defined as nested modules or as standalone files.
Nest modules defines unit tests. They can be defined by a separate module annotated by some attributes:
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}Standalone files in the top-level /tests folder defines integration tests. It is best practice to put them into a single crate.
Test Only Dependencies
We can add dev-dependencies
[dev-dependencies]
tempdir = "0.3"