# fixture

class oslo_service.fixture.SleepFixture

  Bases: `Fixture`

  A fixture for mocking the `wait()` within loopingcall events.

  This exists so test cases can exercise code that uses loopingcall without actually incurring wall clock time for sleeping.

  The mock for the `wait()` is accessible via the fixture’s `mock_wait` attribute.

  Note

  It is not recommended to assert specific arguments (i.e. timeout values) to the mock, as this relies on the internals of loopingcall not changing.

  Example usage:

      from oslo.service import fixture
      ...
      class MyTest(...):
          def setUp(self):
              ...
              self.sleepfx = self.useFixture(fixture.SleepFixture())
              ...

          def test_this(self):
              ...
              thing_that_hits_a_loopingcall()
              ...
              self.assertEqual(5, self.sleepfx.mock_wait.call_count)
              ...

this page last updated: 2026-03-27 12:54:00

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