# Terra Service

The Terra service integrates [axe accessibility](https://github.com/dequelabs/axe-core) and screenshot comparison testing commands into the test environment. Invoking the axe engine will perform a static analysis of the entire document and dom structure.

A list of available commands can be viewed [here](../about#test-utilities).

## Options

### selector

An optional selector can be configured in the `serviceOptions` to specify the default element to be captured when taking a screenshot. Accessibility testing ignores this option and always tests the entire document.

Type: `string`

Required: `false`

Default: `[data-terra-test-content] *:first-child`

Example:

```js
// wdio.conf.js
const { config } = require('@cerner/terra-functional-testing');

config.serviceOptions = {
  selector: '#root',
};

exports.config = config;
```