package com.gathin.tvhome;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

/** Plain JVM tests for fade_rows: how tall the fade at the grid's top edge is for a given scroll. */
public class TopFadeTest {

    @Test
    public void theDockAtRestIsUntouched() {
        assertEquals(0f, TopFade.height(0, 72f), 0f);
        assertEquals(0f, TopFade.height(-5, 72f), 0f);   // an overscroll never fades anything
    }

    @Test
    public void theFadeGrowsInWithTheFirstPixelsOfScrolling() {
        assertEquals(10f, TopFade.height(10, 72f), 0f);
        assertEquals(71f, TopFade.height(71, 72f), 0f);
    }

    @Test
    public void thenItStaysAtItsFullLength() {
        assertEquals(72f, TopFade.height(72, 72f), 0f);
        assertEquals(72f, TopFade.height(5000, 72f), 0f);
    }
}