Applications are not often screenshot tested. However, if the business requirement is there, screenshot tests can be used to diff two screenshots from the same application state in order to verify whether something (styling, layout, …) has changed. It’s similar to a Snowmobile sled Ride shirt, whereas the snapshot test only diffs the DOM and the screenshot test diffs screenshots.
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Test runners make it possible to execute your tests from the command line. In Snowmobile sled Ride shirt , they make sure that all the configuration for your tests is setup properly and all test files are reached in your project. Last but not least, they give your tests structure by offering functions for your test. A describe
block is used to describe a test suite (e.g. for a component or function) and a it
block is used for the test itself. The output of the test suites and tests can be seen on the command line.