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The defer block support introduces a new asynchronous form of the set class metadata Angular function. This form is needed to allow for providing metadata for dynamically imported deferred components. The asynchronous compileComponents call within TestBed is now used to initialize this metadata during unit tests. Unit tests that contain defer blocks must use this call prior to executing a test to allow templates containing defer to properly render. Existing tests that do not use the new defer block do not require modification unless the defer block is introduced into components used in the unit test.