Continuous Delivery by Jez Humble & David Farley

Author:Jez Humble & David Farley [Humble, Jez & Farley, David]
Language: eng
Format: epub
ISBN: 9780321601919
Publisher: Pearson
Published: 2010-09-15T00:00:00+00:00

Parallel Testing

When the isolation of your acceptance tests is good, another possibility to speed things up presents itself: running the tests in parallel. For multiuser, server-based systems this is an obvious step. If you can divide your tests so that there is no risk of interaction between them, then running the tests in parallel against a single instance of the system will provide a significant decrease in the duration of your acceptance test stage overall.

Using Compute Grids

For systems that are not multiuser, for tests that are expensive in their own right, or for tests where it is important to simulate many concurrent users, the use of compute grids is of enormous benefit. When combined with the use of virtual servers, this approach becomes exceedingly flexible and scalable. At the limit, you could allocate each test its own host, so the acceptance test suite would only take as long as its slowest test.

In practice, more constrained allocation strategies usually make more sense. This advantage has not been lost on some of the vendors in this space. Most modern CI servers provide the facility to manage a grid of test servers for just this purpose. If you are using Selenium, another alternative is to use the open source Selenium Grid, which allows for the use of unmodified acceptance tests written to use Selenium Remoting to be executed in parallel on a compute grid.

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