$ cargo test add
Compiling adder v0.1.0 (file:///projects/adder)
Finished test [unoptimized + debuginfo] target(s) in 0.61s
- Running target/debug/deps/adder-92948b65e88960b4
+ Running unittests (target/debug/deps/adder-92948b65e88960b4)
running 2 tests
test tests::add_three_and_two ... ok