Added RegularItem with tests

js-jest/src/gilded_rose.js

@@ -11,6 +11,30 @@ class Item {
   }
 }
 
+class RegularItem extends Item {
+  constructor (itemProps) {
+    const { name, sellIn, quality } = itemProps
+    super(name, sellIn, quality)
+    this.validateItemProps(itemProps)
+  }
+
+  validateItemProps({ name, sellIn, quality }) {
+    const errors = [];
+
+    const isNameValid = typeof name === 'string' && name.length
+    const isSellInValid = typeof sellIn === 'number' && sellIn > 0
+    const isQualityValid = typeof quality === 'number' && quality >= 0 && quality <=50
+
+    !isNameValid && errors.push('"name" must be a valid, non-empty string')
+    !isSellInValid && errors.push('"sellIn" must be an integer, greater than zero')
+    !isQualityValid && errors.push('"qualityValid" must be an integer, between 0 and 50')
+
+    if (errors.length) {
+      throw new Error(`[RegularItem.validateItemProps] Invalid itemProps passed to the constructor: ${errors.join(', ')}`)
+    }
+  }
+}
+
 class Blade extends Item {
   constructor(...args) {
     super(...args)
@@ -91,5 +115,6 @@ class Shop {
 module.exports = {
   Item,
   Shop,
-  Sword
+  Sword,
+  RegularItem
 }

js-jest/test/gilded_rose.test.js

@@ -1,9 +1,32 @@
-const { Shop, Item } = require('../src/gilded_rose')
+const { Shop, Item, RegularItem } = require('../src/gilded_rose')
 
-describe('Gilded Rose', function () {
-  it('should foo', function () {
-    const gildedRose = new Shop([new Item('foo', 0, 0)])
-    const items = gildedRose.updateQuality()
-    expect(items[0].name).toBe('fixme')
+// describe('Gilded Rose', function () {
+//   it('should foo', function () {
+//     const gildedRose = new Shop([new Item('foo', 0, 0)])
+//     const items = gildedRose.updateQuality()
+//     expect(items[0].name).toBe('fixme')
+//   })
+// })
+
+describe('RegularItem', () => {
+  const getRegularItemFactory = (itemProps) => () => new RegularItem({
+    name: 'Mock RegularItem',
+    sellIn: 5,
+    quality: 25,
+    ...itemProps
+  })
+
+  it('should throw an error if initialized with an invalid name', () => {
+    expect(getRegularItemFactory({ name: '' })).toThrow()
+  })
+
+  it('should throw an error if initialized with an invalid sellIn property', () => {
+    expect(getRegularItemFactory({ sellIn: -1 })).toThrow()
+    expect(getRegularItemFactory({ sellIn: 0 })).toThrow()
+  })
+
+  it('should throw an error if initialized with a quality property < 0 || > 50', () => {
+    expect(getRegularItemFactory({ quality: -1 })).toThrow()
+    expect(getRegularItemFactory({ quality: 51 })).toThrow()
   })
 })