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

> function tx(): tx Create a test transaction builder containing this test operation call. Since 0.10.4

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

FUNCTION

# op.tx

```signature
function tx(): tx
```

Create a test transaction builder containing this test operation call.

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/op/tx.html)Generated API reference, mirrored from the live docs