docs: improve standalone testing documentation - #31313
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Add context about using exported `componentOnReady` helper to make tests more accurate for custom-element builds.
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Issue number: resolves #31312
What is the current behavior?
Current docs don't provide recommended testing guidance for accurately testing standalone components. This can create issues because a standalone (custom-elements) build doesn't expose
el.componentOnReady(), so any test that reads fixture.nativeElement before hydration in a standalone project has the potential to not be testing what they think they are.What is the new behavior?
componentOnReadyhelper from@ionic/corein Angular'stesting.mdfiletesting.mdfiles for React and VueDoes this introduce a breaking change?