Click on an element by index

[ianrhamilton]

Hi, I have a view that contains one to many views with the same ids, and with barista, I cannot figure out a way of accessing a particular element by its index. For example, my screen contains three boarding passes that I swipe to check elements on these cards.

The only workaround that I have found so far is to create my own clickOn() function:

 fun clickOn(id: Int, index: Int) {
        findWithIndex(id, index).perform(click())
    }

private fun findWithIndex(viewId: Int, index: Int): ViewInteraction {
        return onView(withIndex(withId(viewId), index))
    }

private fun withIndex(matcher: Matcher<View?>, index: Int): Matcher<View?>? {
        return object : TypeSafeMatcher<View?>() {
            var currentIndex = 0
            override fun describeTo(description: Description) {
                description.appendText("with index: ")
                description.appendValue(index)
                matcher.describeTo(description)
            }

            override fun matchesSafely(view: View?): Boolean {
                return matcher.matches(view) && currentIndex++ == index
            }
        }
    }

This does serve my purpose, however, I wondered if there was something I was missing with Barista that I could leverage? Otherwise, i'd have to create functions for clickOn and getText() etc.

Thanks,
Ian

[Sloy]

Hello @ianrhamilton!
Do your items contain different texts? Do you know their text?
In that case, you could use clickOn("Boarding pass 1") instead of the view id.

[ianrhamilton]

hey @Sloy! Thanks for the speedy response. That's a good question! I think my approach was wrong. What I was trying to achieve was swiping right on an element (that has duplicate id's), and then getting the text of elements.

I was able to achieved this successfully by doing:
swipeViewPagerForward() and assertDisplayed("Boarding pass 1") (as I am using mocked data the text is always the same). Thanks for your suggestion :)

Great work on Barists by the way, I love it. I've started refactoring our espresso tests to use Barista now.

[Sloy]

Great! I'm glad I could help and you found a solution :)

Good luck with the refactoring! I hope you can simplify your code with Barista :D

[anefedov]

Hi @Sloy
Similar question, but in my case, we have buttons without text, so we only can use the index.
clickOn() only accepts Int or String. What would be your recommendation?

[Sloy]

Hi @anefedov. Your options depend. If your buttons are on a ListView or RecyclerView, there are specialized functions for that. Otherwise, if there is only one button visible at a time, clickOn() should find the one visible. If not, you are out of luck. I don't think we have a function for that in Barista. You should write some custom Espresso code for that. Something like onView(firstOf(withText("My button")).perform(onClick()).
(You should find some matcher like firstOf by Googling, I don't think we have one in Barista but I can't check right now)

[ianrhamilton]

Hi @Sloy Similar question, but in my case, we have buttons without text, so we only can use the index. clickOn() only accepts Int or String. What would be your recommendation?

You can use the workaround I provided above for clicking an element by index.