Cannot scroll to view in NestedScrollView

[minibugdev]

Steps to reproduce:

Define layout with NestedScrollView

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView>
    <LinearLayout>
        .
        .
        .
        <Button>
    </LinearLayout>
</android.support.v4.widget.NestedScrollView>

And scroll to view by scrollTo()

screen {
  snackbarButton {
      scrollTo()
      click()
  }

  snackbar {
      isDisplayed()
  }
}

Observed Results:

PerformException: Error performing 'scroll to' on view

[Unlimity]

Hello there! Can you provide more info? Stacktrace at least?
And by the way, your button in provided example is named snackbarButton. Are you actually calling snackbar? If so, snackbar is added to your root view and there is no need to scroll to it. Also please provide your screen class, maybe matching is wrong.

[minibugdev]

Hi, sorry to have confused you.
I try to scroll to button, which inside NestedScrollView and click it
and lastly assert SnackBar should display

Updated code as below
Layout

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
	xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/content"
	android:layout_width="match_parent"
	android:layout_height="match_parent">

	<LinearLayout
		android:layout_width="match_parent"
		android:layout_height="match_parent"
		android:orientation="vertical">

		<Space
			android:layout_width="wrap_content"
			android:layout_height="600dp"
			android:textColor="@color/background_color" />

		<Button
			android:id="@+id/button"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:text="BUTTON" />
	</LinearLayout>
</android.support.v4.widget.NestedScrollView>

Screen

    val content: KView = KView { withId(R.id.content) }
    val button: KButton = KButton { withId(R.id.button) }

    val snackbar: KSnackbar = KSnackbar()

Test

    @Test
    fun testContentScreen() {
        screen {
            content {
                isVisible()
            }

            button {
                scrollTo()
                click()
            }

            snackbar {
                isDisplayed()
            }
        }
    }

An exception

android.support.test.espresso.PerformException: Error performing 'scroll to' on view '(with id: com.agoda.sample:id/button)'.
at android.support.test.espresso.PerformException$Builder.build(PerformException.java:84)
at android.support.test.espresso.base.DefaultFailureHandler.getUserFriendlyError(DefaultFailureHandler.java:81)
at android.support.test.espresso.base.DefaultFailureHandler.handle(DefaultFailureHandler.java:52)
at android.support.test.espresso.ViewInteraction.waitForAndHandleInteractionResults(ViewInteraction.java:312)
at android.support.test.espresso.ViewInteraction.desugaredPerform(ViewInteraction.java:167)
at android.support.test.espresso.ViewInteraction.perform(ViewInteraction.java:110)
at com.agoda.kakao.BaseActions$DefaultImpls.scrollTo(Actions.kt:148)
at com.agoda.kakao.KBaseView.scrollTo(Views.kt:30)
at com.agoda.sample.NestedScrollViewActivityTest$testContentScreen$1$2.invoke(NestedScrollViewActivityTest.kt:26)
at com.agoda.sample.NestedScrollViewActivityTest$testContentScreen$1$2.invoke(NestedScrollViewActivityTest.kt:11)

[minibugdev]

I resolved by create custom action like

class NestedScrollActions(private val original: ScrollToAction = ScrollToAction()) : ViewAction by original {

    override fun getConstraints(): Matcher<View> = CoreMatchers.anyOf(
            CoreMatchers.allOf(
                    withEffectiveVisibility(ViewMatchers.Visibility.VISIBLE),
                    isDescendantOfA(isAssignableFrom(NestedScrollView::class.java)))
            , original.constraints
    )
}

and use act for perform it

button {
    act {
        NestedScrollActions()
    }
    click()
}

Anyway, I'm not sure this is good enough solution for make a PR.

[Unlimity]

Maybe the problem was with how you matched your button. It is possible that you need to match your button as a child of nested scroll view in your screen class. Cheers!