# test_optional_params_message · FT4 Rell API · Chromia Docs (concept)

> function test_ optional_ params_ message(gtv: gtv): text 

Source: https://docs.chromia.com/pages/ft4-rell/-f-t4-library/tests.operations/test_optional_params_message/

FUNCTION

# test\_optional\_params\_message

```signature
function test_optional_params_message(gtv: gtv): text
```

[Source](https://gitlab.com/chromaway/ft4-lib/-/blob/development/rell/src/tests/operations/module.rell#lines-63)

[View this page on docs.chromia.com](https://docs.chromia.com/pages/ft4-rell/-f-t4%20-library/tests.operations/test_optional_params_message.html)Generated API reference, mirrored from the live docs