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The more the tests, the longer the build. And when the build gets longer, the bugs take longer to fix, the features take longer to deploy. Every build should be minutes long, all tests included.
Now lets say, our test suite takes much longer than that. How to reduce its duration? Where to start?
Making tests become useless, converting functional tests to unit tests, running tests in parallel, building projects in parallel, doing slow tasks only once, writing fast DBMS tests... Let's share dozens of tips to fasten you test suite A LOT.