GildedRose-Refactoring-Kata/Java/src/test/java/com/gildedrose/GildedRoseTest.java

package com.gildedrose;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;

public class GildedRoseTest {

    @Test
    public void foo() {
        Item[] items = new Item[] { new Item("foo", 0, 0) };
        GildedRose app = new GildedRose(items);
        app.updateQuality();
        assertEquals("foo", app.items[0].name);
    }

    @Test
    @DisplayName("At the end of each day our system lowers both values for every item")
    public void shouldLowerBothValues(){
        Item[] items = new Item[] { TestHelper.getItem("foobar", 2, 2) };
        GildedRose app = new GildedRose(items);
        app.updateQuality();
        assertEquals(1, app.items[0].quality);
        assertEquals(1, app.items[0].sellIn);
    }

    @Test
    @DisplayName("Once the sell by date has passed (<=0), Quality degrades twice as fast")
    public void shouldDowngradeTwiceAsFastAfterSellDate(){
        Item[] items = new Item[] { TestHelper.getItem("foobar", 1, 5) };
        GildedRose app = new GildedRose(items);

        //day 1, drop by 1
        app.updateQuality();
        assertEquals(4, app.items[0].quality);
        assertEquals(0, app.items[0].sellIn);

        //day 2, drop by 2
        app.updateQuality();
        assertEquals(2, app.items[0].quality);
        assertEquals(-1, app.items[0].sellIn);
    }

    @Test
    @DisplayName("The Quality of an item is never negative")
    public void shouldNeverHaveANegativeQuality() {
        Item[] items = new Item[]{TestHelper.getItem("foobar", 0, 0)};
        GildedRose app = new GildedRose(items);

        //day 1, drop by 1
        app.updateQuality();
        assertEquals(0, app.items[0].quality);

        //day 2, drop by 1 => quality is still 0
        app.updateQuality();
        assertEquals(0, app.items[0].quality);
    }


    @Test
    @DisplayName("\"Aged Brie\" actually increases in Quality by 2 the older it gets")
    public void shouldSeeAgedBrieIncreasedQualityDayByDay(){
        Item[] items = new Item[]{TestHelper.getItem("Aged Brie", 0, 0)};
        GildedRose app = new GildedRose(items);

        //day 1, add 2
        app.updateQuality();
        assertEquals(2, app.items[0].quality);

        //day 2, add 2
        app.updateQuality();
        assertEquals(4, app.items[0].quality);
    }

    @Test
    @DisplayName("The Quality of an item is never more than 50")
    public void shouldNeverHaveQualityHigherThan50(){
        Item[] items = new Item[]{TestHelper.getItem("Aged Brie", 0, 49)};
        GildedRose app = new GildedRose(items);

        //day 1, add 2
        app.updateQuality();
        assertEquals(50, app.items[0].quality);

        //day 2, add 2
        app.updateQuality();
        assertEquals(50, app.items[0].quality);
    }

    //Sulfuras, Hand of Ragnaros
    @Test
    @DisplayName("\"Sulfuras\", being a legendary item, never has to be sold or decreases in Quality")
    public void should(){
        Item[] items = new Item[]{TestHelper.getItem("Sulfuras, Hand of Ragnaros", 0, 10)};
        GildedRose app = new GildedRose(items);

        //day 1, don't impact quality
        app.updateQuality();
        assertEquals(10, app.items[0].quality);
        assertEquals(0, app.items[0].sellIn);

        //day 0, don't impact quality
        app.updateQuality();
        assertEquals(10, app.items[0].quality);
        assertEquals(0, app.items[0].sellIn);
    }

}