When I updated project to AndroidStudio 3 unit tests became runnig slowly (about 6 mimutes) than AndroidStudio 2. Recently, I updated project to AndroidStudio3.1, but test running time stayed the same.
2 Answers
It's a (now) known issue for Kotlin in AS 3 https://issuetracker.google.com/issues/37028496 This happens because AS calls the assemble* tasks (which build up the APK) for kotlin unit tests.
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