KToast

class KToast : BaseActions, TextViewAssertions {

    private val builder = ViewBuilder().apply( {withAnyText()} )
    val matcher = this.builder.getViewMatcher()
    override val view = this.builder.getViewInteraction().inRoot(ToastMatcher())

    /**
     * Operator that allows usage of DSL style
     *
     * @param function Tail lambda with receiver which is your view
     */
    operator fun invoke(function: KToast.() -> Unit) {
        function(this)
    }
}

class ToastMatcher : TypeSafeMatcher<Root>() {
    override fun describeTo(description: Description) {
        description.appendText("is toast")
    }

    override fun matchesSafely(root: Root): Boolean {
        val type = root.windowLayoutParams.get().type
        if (type == WindowManager.LayoutParams.TYPE_TOAST) {
            val windowToken = root.decorView.windowToken
            val appToken = root.decorView.applicationWindowToken
            if (windowToken === appToken) {
                //means this window isn't contained by any other windows.
                return true
            }
        }
        return false
    }
}