$ cargo test -- --show-output
Compiling silly-function v0.1.0 (file:///projects/silly-function)
Finished test [unoptimized + debuginfo] target(s) in 0.60s
- Running unittests (target/debug/deps/silly_function-160869f38cff9166)
+ Running unittests src/lib.rs (target/debug/deps/silly_function-160869f38cff9166)
running 2 tests
test tests::this_test_will_fail ... FAILED