Posted over 4 years ago. Visible to the public. Linked content.

Testing setTimeout and setInterval with Jasmine

Jasmine has a jasmine.clock() helper that you can use to travel through time and trigger setTimeout and setInterval callbacks:

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beforeEach(function() { timerCallback = jasmine.createSpy("timerCallback"); jasmine.clock().install(); }); afterEach(function() { jasmine.clock().uninstall(); }); it("causes a timeout to be called", function() { setTimeout(function() { timerCallback(); }, 100); expect(timerCallback).not.toHaveBeenCalled(); jasmine.clock().tick(101); expect(timerCallback).toHaveBeenCalled(); });

If you actually want the test to wait out the timer, your example function needs to accept a done argument, which you then call when the test is expected to finish:

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it("causes a timeout to be called", function(done) { setTimeout(function() { timerCallback(); }, 100); setTimeout(function() { expect(timerCallback).toHaveBeenCalled(); done(); }, 101); });

Needless to say the second test is much slower than the first test.

Does your version of Ruby on Rails still receive security updates?
Rails LTS provides security patches for old versions of Ruby on Rails (3.2 and 2.3).

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Henning Koch
Last edit:
over 3 years ago
by Henning Koch
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We are makandra and do test-driven, agile Ruby on Rails software development.
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Posted by Henning Koch to makandra dev
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