$ cargo test --test integration_test
   Compiling adder v0.1.0 (file:///projects/adder)
    Finished test [unoptimized + debuginfo] target(s) in 0.64s
     Running target/debug/deps/integration_test-82e7799c1bc62298

running 1 test
test it_adds_two ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out

