smoothScroll

mouseInputSmoothScroll

fun mouseInputSmoothScroll() {
    composeTestRule.onNodeWithTag("horizontalScrollable").performMouseInput {
        // Scroll forwards horizontally, which is rightwards
        // unless scroll direction is reversed
        smoothScroll(100f, durationMillis = 500L, ScrollWheel.Horizontal)
        // The 100f scroll delta is equally divided into smaller scrolls,
        // such that the time in between two scroll events is more or less
        // equal to the default time between events, 16ms.
    }
}