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In this course we wrote a lot of code and we tested a lot of code of course.

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We always tested it manually by simply clicking around in our web application.

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In this module here, we'll dive into automated testing,

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that means we'll write code which will actually test our code,

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so code that runs to run other code and evaluate the results.

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This is indeed what this module will be about,

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we'll dive into what exactly testing is and why we use it,

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we'll have a look at different kinds of tests namely unit tests, integration tests and end-to-end tests

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and we'll also explore how we can test both synchronous and asynchronous code and in general, get a thorough

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introduction into the world of testing.