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Editorial Team
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Asked: 2026-06-16T07:37:18+00:00

I have a rails app with about 40 tests using the default rails test:unit.

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I have a rails app with about 40 tests using the default rails test:unit. The tests themselves run quickly, but there is a delay of about 8 seconds where rake test seems to be doing something in the background, and then the tests are run.

I am using linux to run the tests.

What is happening in this time after rake test is called, but before the tests run? Is there a way to reduce or eliminate this wait time?

Here is a screenr video to illuminate the question. The time in question is 0:04 – 0:11.

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1 Answer

  1. Editorial Team

    I think it’s loading the rails environment (running your initializers, loading your models and controllers, etc). I find this to be aggravatingly slow, particularly on Windows machines, and especially on jRuby (which has to start up the JVM as well).

    There are ways to speed up jRuby, listed here, but ruby on Windows still seems to be very slow compared to OSX or linux.

    Edit: just saw your video. You’re waiting less than 10 seconds. Compared to the 20+ seconds I get on Windows machines that’s not so bad.

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