What's the best way to test the front end of your application?

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For example if one page of the application is a form for the user to fill out. I want to test inputting a bunch of data on the form, and then check the database so that the expected data is there at the end. Or if a user goes to the registration page and fills out the form to create a new account, I want to test that the new account with the expected input data is now in the database. Is there a tool that will fill out the relevant data and click the appropriate buttons, and that will also do it in the test environment?

What’s the right way to test this?

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If you want to test the whole page, you’ll want to use an End to End testing tool like Chimp, Cypress, Puppeteer, SlimerJS, etc.

What they do is run a full browser instance and then execute the tests you have specified.
I recommend you check out some of the tools or search for End to End testing guides

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