d2-ui
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# `.key() => String`
Returns the key value for the node of the current wrapper.
NOTE: can only be called on a wrapper of a single node.
#### Example
```jsx
const wrapper = shallow(
<ul>
{['foo', 'bar'].map(s => <li key={s}>{s}</li>)}
</ul>
).find('li');
expect(wrapper.at(0).key()).to.equal('foo');
expect(wrapper.at(1).key()).to.equal('bar');
```