If you use Vercel, Netlify, Cloudflare Pages or a similar system to generate PR preview URLs you can use the Meticulous GitHub app to test your PRs for you:
Step 1: Install the Meticulous GitHub app
Begin by installing the Meticulous GitHub app.
Step 2: Integrate with your preview URL provider
Once the GitHub app is installed, select the system you use to generate PR preview links:
Install the Meticulous Vercel integration and link your Vercel project in Meticulous.
If you have multiple Vercel projects for your GitHub repo, or multiple environments that you deploy the same branches/commits to, then you'll need to let Meticulous know which environments it should run the tests against. You can do so by navigating to your project page and clicking on the 'Settings' tab.
Step 3 (optional): Make the Meticulous check blocking
Whenever you open a new pull request Meticulous will now simulate a set of sessions against the preview URL before and after the PR, and post a comment to the PR notifying of any changes spotted.
If you wish, you can make this check blocking by following the instructions here. Doing so will prevent developers from merging a PR which has visual differences until they have clicked the button to acknowledge the differences.