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How to use Jest spyOn with React.js and Fetch

How to use Jest spyOn with React.js and Fetch

Why Meticulous?

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Learn how to catch UI bugs without writing or maintaining UI tests
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Meticulous is a tool for software engineers to catch visual regressions in web applications without writing or maintaining UI tests. Meticulous isolates the frontend code by mocking out all network calls, using the previously recorded network responses. This means Meticulous never causes side effects and you don’t need a staging environment.

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Set up in minutes and generate tests to cover your whole application.