> For the complete documentation index, see [llms.txt](https://docs.testmace.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.testmace.com/node-types/assertion-node/one-of-set.md).

# One of set

{% hint style="warning" %}
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{% endhint %}

The **One of set assertion** interface is as follows:

![](/files/-M4OJnBF8LwjQ12YgXnK)

This assertion type is used to ensure if the current value equals to one value from the specified set. In the `Expected value type` field you should specify the type of values you want to compare (strings, numbers or JSON objects).

In the `Expected value` field you should set a list of pissible expected values

The `Use negative statement` flag is used for getting the opposite result, i.e. the current value shouldn't exist in the specified set.

### Error Fixing

The error fixing algorithm depends on the `Use negative statement` flag's state:

* false - the current value is added to the list
* true - the current value is removed from the list


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