Fast Tests, Slow Tests, Filters, and Suites
If you test-drive small, isolated units of code, each of your tests has the ability to run blazingly fast. A typical test might run in less than a millisecond on a decent machine. With that speed, you can run at least thousands of unit tests in a couple seconds.
Dependencies on collaborators that interact with slow resources such as databases and external services will slow things down. Simply establishing a database connection might take 50ms. If a large percentage of your tests must interact with a database, your thousands of tests will require minutes to run. Some shops wait more than a half hour for all their tests to run.
You’ll learn how to begin breaking those dependencies on slow collaborators ...
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