to match snapshot

  • <ReactTestRenderer> to match snapshot

Under jest, you can use snapshots. Snapshot tests save a snapshot of the component as it is currently rendered to a .snapshot file under a directory __snapshots__. Note that the snapshots for unexpected-react are saved to a different filename than those jest uses natively. This is because the format differs slightly.

Remember that to include snapshot support for the test renderer, you need to require unexpected-react as require('unexpected-react/test-renderer-jest')

Given the following test component:

const MyComponent = () => (
  <div className="parent" id="main">

Let's render the output with the test renderer:

const renderer = TestRenderer.create(<MyComponent />);

Then we can validate it matches the snapshot. If no snapshot exists, it will be automatically created the first time it is run.

expect(renderer, 'to match snapshot');

If in the future the component output changes, the error will be highlighted (using the same error highlighting used in the rest of unexpected-react).

Once you have checked that the changes are correct, you can run jest -u to update the snapshot, or if running in watch mode, press u.


Triggered events still works, and can be combined with matching snaphots.


const renderer = TestRenderer.create(<MyButton />);
  'with event click', 
  'to match snapshot'


The snapshot matches everything, so extra classes and attributes will causes a difference to be highlighted. If you want your snapshots to work more like to have rendered, so new attributes, classes and child elements can be added without triggering a change, see the assertion to satisfy snapshot.