# tx.run · Rell standard library · Chromia Docs (concept)

> function run(): unit Build a test block containing only this test transaction. Since 0.10.4

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/rell.test/tx/run/

FUNCTION

# tx.run

```signature
function run(): unit
```

Build a test block containing only this test transaction.

Since 0.10.4

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/rell.test/tx/run.html)Generated API reference, mirrored from the live docs