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

> function tx(txs: list < tx >): block Add a list of test transactions to this test block builder. Parameters txs — the list of transactions to be added to t

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

FUNCTION

# block.tx

```signature
function tx(txs: list<tx>): block
```

Add a list of test transactions to this test block builder.

**Parameters**

* **txs** — the list of transactions to be added to this test block builder

Since 0.10.4

---

```signature
function tx(txs: tx...): block
```

Add test transactions to this test block builder.

**Parameters**

* **txs** — the transactions to be added to this test block builder

Since 0.10.4

---

```signature
function tx(ops: list<op>): block
```

Add a single test transaction to this test block builder; the test transaction consisting of the
specified list of test operation calls.

**Parameters**

* **ops** — the list of test operation calls to include in the transaction

Since 0.10.4

---

```signature
function tx(ops: op...): block
```

Add a single test transaction to this test block builder; the test transaction consisting of the
specified test operation calls.

**Parameters**

* **ops** — the test operation calls to include in the 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/block/tx.html)Generated API reference, mirrored from the live docs