Working with Rust
Testing
An example creating a unit test in Rust. See the How to Write Tests section of the Rust book, and the Unit testing section of Rust by Example for additional details.
Unit Test
To write a test, prefix a function with the #[test]
annotation. You can then use cargo test
to run the test to confirm all the assertions are valid within that function.
fn main() {
let sum = add( 3, 5 );
println!("Sum: {}", sum);
}
fn add(a: i32, b: i32) -> i32 {
a + b
}
#[test]
fn test_add() {
assert_eq!(add(1,2), 3);
assert_eq!(add(-1,0), -1);
assert_ne!(add(5, 6), 12); // not equal
}
An example result running cargo test
❯ cargo test
Compiling tmp v0.1.0 (/home/mkaz/tmp/tmp)
Finished test [unoptimized + debuginfo] target(s) in 0.17s
Running target/debug/deps/tmp-4bcf431473cd6bf8
running 1 test
test test_add ... ok
test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Run a specific test using cargo test TESTNAME
For the example above, cargo test test_add