Espresso RecyclerView Assertions

RecyclerViewAssertion.kt

package com.txusballesteros.instrumentacion.assertion

import android.support.test.espresso.EspressoException
import android.support.test.espresso.ViewAssertion
import android.support.test.espresso.matcher.ViewMatchers.assertThat
import android.support.v7.widget.RecyclerView
import android.view.View
import android.view.View.FIND_VIEWS_WITH_TEXT
import android.widget.TextView
import org.hamcrest.Matchers.greaterThan
import org.junit.Assert.assertEquals
import org.junit.Assert.assertFalse

fun hasItems() = ViewAssertion { view, noViewFoundException ->
    if (view is RecyclerView) {
        assertThat(view.adapter.itemCount, greaterThan(0))
    } else {
     throw noViewFoundException
    }
}

fun hasViewWithTextAtPosition(position: Int = 0,
                              expectedValue: CharSequence) = ViewAssertion { view ,_ ->
    if (view is RecyclerView) {
        val outViews = arrayListOf<View>()
        view.findViewHolderForAdapterPosition(position).itemView
                .findViewsWithText(outViews, expectedValue, FIND_VIEWS_WITH_TEXT)
        assertFalse(outViews.isEmpty())
    } else {
        throw RecyclerViewAssertionException("The view is not a RecyclerView.")
    }
}

inline fun hasViewWithIdAtPosition(position: Int = 0,
                                   viewId: Int,
                                   crossinline assert: (View) -> Unit) = ViewAssertion { view ,_ ->
    if (view is RecyclerView) {
        view.findViewHolderForAdapterPosition(position).itemView.findViewById<View>(viewId)?.let {
            assert(it)
        } ?: throw RecyclerViewAssertionException("The view holder hasn't got a view with the specified ID, $viewId.")
    } else {
        throw RecyclerViewAssertionException("The view is not a RecyclerView.")
    }
}

fun hasViewWithIdAndTextAtPosition(position: Int = 0,
                                   viewId: Int,
                                   expectedValue: CharSequence) = ViewAssertion { view ,_ ->
    if (view is RecyclerView) {
        view.findViewHolderForAdapterPosition(position).itemView.findViewById<TextView>(viewId)?.let {
            assertEquals(expectedValue, it.text)
        } ?: throw RecyclerViewAssertionException("The view holder hasn't got a view with the specified ID, $viewId.")
    } else {
        throw RecyclerViewAssertionException("The view is not a RecyclerView.")
    }
}

class RecyclerViewAssertionException(message: String): RuntimeException(message), EspressoException