AdapterTest.kt

class TestFragmentTest: RobolectricTest() {
 
        @Test
        fun `test adapter dsl`() {
            val scenario = launchFragmentInContainer<TestFragment>()
            scenario.onFragment {
                val recyclerView = it.requireView().findViewById<RecyclerView>(R.id.recycler)
 
                val headerViewHolder =
                    recyclerView.findViewHolderForLayoutPosition(0) ?: throw IllegalStateException()
 
                val header =
                    headerViewHolder.itemView.findViewById<TextView>(R.id.header)
 
                assertThat(header.text.toString(), equalTo("Title"))
 
                header.performClick()
 
                val titleText = ShadowToast.getTextOfLatestToast()
 
                assertThat(titleText, equalTo("Title"))
 
                val contentViewHolder =
                    recyclerView.findViewHolderForLayoutPosition(1) ?: throw IllegalStateException()
 
                contentViewHolder.itemView.performClick()
 
                val rowText = ShadowToast.getTextOfLatestToast()
 
                assertThat(rowText, equalTo("Row Tapped"))
 
                val content =
                    contentViewHolder.itemView.findViewById<TextView>(R.id.content)
 
                assertThat(content.text.toString(), equalTo("Content"))
 
            }
 
        }
    }