IssueTracker

/* ***********
     * Impl
     * *********** */

/**
 * Returns a [Sequence] walking up this view's [parent][View.getParent] hierarchy chain.
 */
val View.ancestors: Sequence<ViewParent>
    get() = generateSequence(parent, ViewParent::getParent)


    /* ***********
     * Tests
     * *********** */

@Test
fun ancestors_root() {
    val actual = view.ancestors.toList()

    val expected = emptyList<ViewParent>()
    assertEquals(expected, actual)
}

@Test
fun ancestors() {
    val parents = listOf(
            FrameLayout(context),
            LinearLayout(context),
            RelativeLayout(context)
    )
    for ((parent, child) in parents.zipWithNext()) {
        parent.addView(child)
    }
    parents.last().addView(view)

    val expected = parents.reversed()
    val actual = view.ancestors.toList()
    assertEquals(expected, actual)
}