How can I write tests that cover code I've implemented

Sorry, guys - I've searched and I can't find any details on how to write tests.
I have the following (cut-down) Sortable tree:
` ({
onClick: e =>
disabled || this.ignoreItem(e) ? {} : setGroup(rowInfo.node),
})}
/>
`
How can I test that the generated onClick event works as expected? (treeData, disabled, and setGroup are props)

Thanks!