In a **macOS** terminal:
```
./src/bitcoind -regtest
```
In another **macOS** terminal:
```
./src/bitcoin-cli -regtest help
```
You should not be able to visualize if following warning in stdout/stderr:
The following warning should not be seen in stdout/stderr:
`[warn] kq_init: detected broken kqueue; not using.: Undefined error: 0`