CODEWITHSUNDEEP
androidandroid-espressoandroid-instrumentation
malik_cesur
malik_cesur

Reputation: 310

Espresso doubleClick() does not work on some devices

I'm writing UI tests using Espresso. I need to test a flow on double click but failed to do so on some devices. 

onView(withId(R.id.idOfView))
            .check(matches(someAssertion()))
            .perform(doubleClick())

But this performs single click, (sometimes two single clicks) on my Nexus 5 - API Level 23 emulator. Funny workaround 

perform(click(), doubleClick())

it works. But I'm not sure if I can trust this. Is there anything that I'm missing?

Upvotes: 1

Views: 471

Answers (1)

Michael
Michael

Reputation: 58507

For two clicks to be recognized as a double-click, the second click's DOWN event must occur within [min, max] ms of the first click's UP event. min and max may vary across different devices, but values I've seen are 40 ms min, and 300 ms max.

A doubleClick ViewAction leads to a GeneralClickAction with a DOUBLE Tapper.

That DOUBLE Tapper will wait for the minimum required delay before performing its second tap.
What may be happening on your emulator is that it's not running fast enough for the second click event to be injected before you've passed the maximum allowed delay.

When you do perform(click(), doubleClick()) there might not be any added wait between the click and the doubleClick, so the click and the first click of the doubleClick may end up being recognized as a double-click on your slow emulator. That doesn't guarantee that it would work on an actual device, or on an emulator running on a faster computer.

Upvotes: 1

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