> ## 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 cases, including ones you uploaded.

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>