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Testing asynchronous systems is hard. Not only does it require handling threads, timeouts and concurrency issues, but the intent of the test code can be obscured by all these details. Awaitility is a DSL that allows you to express expectations of an asynchronous system in a concise and easy to read manner. For example:

public void updatesCustomerStatus() throws Exception {
    // Publish an asynchronous event:
    // Awaitility lets you wait until the asynchronous operation completes:
    await().atMost(5, SECONDS).until(customerStatusIsUpdated());

See getting starting and usage guide for more info.

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  • 2017-04-28: Awaitility 3.0.0 is released with lots of improvements and changes to 2.0.0. See release notes and changelog for details.
  • 2017-04-07: Awaitility 3.0.0-rc3 is released. It allows you to specify poll thread(s) and changed the behavior of “untilAsserted” so that lambda expressions are allowed to throw checked exceptions. See changelog for details.
  • 2017-03-31: Awaitility 3.0.0-rc2 is released. It fixes some bugs that were found in the previous release candidate and it includes the ability to specify the poll executor service and uses one less thread by default. See changelog for details.

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Release Notes

Release Notes


For minor changes see change log.



Awaitility is developed and maintained by Johan Haleby with the help of numerous other contributors over the years. Would you like to contribute to the project in any way? Submit a pull request or contact Johan at Twitter.

Johan started the project with Jan Kronquist when they were both working at Jayway back in January of 2010. The project is now sponsored by Parkster.