> ## Documentation Index
> Fetch the complete documentation index at: https://docs.galtea.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Extend Test Cases

> Add more test cases to a Galtea-generated dataset by re-running the generator that created it

## What is Extend?

Extend adds more test cases to a dataset that **Galtea generated**. It re-runs the same generator that created the dataset and appends the new cases to it. The test cases it already has are kept.

This is the right way to grow a generated dataset — for example an onboarding dataset that started with only a few cases. The new cases are produced the same way the original ones were, so they stay consistent with the dataset's purpose.

<Info>
  Extend keeps your existing cases and adds new ones. It never replaces them. While it runs, the [dataset](/concepts/product/dataset) is in the `EXTENDING` status; when it finishes, the dataset returns to `SUCCESS`.
</Info>

## Extend vs. Data Augmentation

Both add more cases to a dataset, but they work differently:

* **Extend** re-runs the dataset's **original generator** (for [Behavior](/concepts/product/dataset/behavior-datasets), [Security & Safety](/concepts/product/dataset/security-datasets), or [Accuracy](/concepts/product/dataset/accuracy-datasets)). It is available only for datasets Galtea generated.
* **[Data Augmentation](/concepts/product/dataset/data-augmentation)** creates new cases by learning from the dataset's **existing cases**. It works on any dataset that has text-only cases, including ones you uploaded, but not one whose cases carry audio or file inputs.

In the dashboard you will see one button or the other, depending on the dataset: **Extend Test Cases** for a generated dataset, **Augment Test Cases** for a dataset that cannot be extended (for example one you uploaded from a file).

## When Extend is available

A dataset can be extended when Galtea generated it **and** it still has the input its generator needs:

* **Behavior** datasets need a scenario style (strategy).
* **Security & Safety** datasets need at least one threat (variant).
* **Accuracy** datasets need the ground-truth document they were generated from.

Uploaded datasets cannot be extended, because there is no generator behind them — use Data Augmentation for those.

## How to Use Extend

You can extend a generated dataset directly from the [Galtea dashboard](https://platform.galtea.ai/):

<Steps>
  <Step title="Open a generated dataset">
    Go to the **Datasets** section and open a dataset that Galtea generated.
  </Step>

  <Step title="Click Extend Test Cases">
    Use the **Extend Test Cases** button and choose how many cases to add.
  </Step>

  <Step title="Wait for generation">
    The dataset enters the `EXTENDING` status while the generator runs. When it finishes, the new cases are added alongside the existing ones and the dataset returns to `SUCCESS`.
  </Step>
</Steps>

## Related

<CardGroup cols={2}>
  <Card title="Data Augmentation" icon="wand-magic-sparkles" href="/concepts/product/dataset/data-augmentation">
    Expand any dataset from its existing cases.
  </Card>

  <Card title="Datasets" icon="flask" href="/concepts/product/dataset">
    Learn about datasets and dataset types in Galtea.
  </Card>
</CardGroup>