I have included a main function that does nothing ```fn main() { }``` and now it says that the test  "passed". It looks like it is not benchmarking anything.

```
running 1 test
test [run-pass] bench/basic_benches.rs ... ok

using metrics ratchet: tmp/check-stage1-T-x86_64-unknown-linux-gnu-H-x86_64-unknown-linux-gnu-bench-metrics.json
result of ratchet: 0 metrics added, 0 removed, 0 improved, 0 regressed, 0 noise
updated ratchet file

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured
```