[Linesh][#22] Feature: enemy should be able to cross the screen

EthanLin-TWer · Mar 19, 2017 · cad5fb1 · cad5fb1
1 parent 74274e6
commit cad5fb1
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/js/Enemy.js b/js/Enemy.js
@@ -11,6 +11,9 @@ export class Enemy {
 
    update(dt) {
       this.x += dt * this.speed
+      if (this.x > Game.col(6)) {
+         this.x -= Game.col(6)
+      }
    }
 
    render() {

diff --git a/test/unit/enemy.spec.js b/test/unit/enemy.spec.js
@@ -6,7 +6,7 @@ import { Player } from '../../js/Player'
 
 describe('enemy', () => {
 
-   describe('move functionality', () => {
+   describe('move functionalities', () => {
       it('should be able to move', () => {
          let enemy = new Enemy(Game.col(1), Game.row(2), Speed.NORMAL)
          enemy.update(1)
@@ -27,6 +27,15 @@ describe('enemy', () => {
 
          expect(enemy.speed).to.equal(Speed.VERY_SLOW)
       })
+
+      it('should cross the screen when disappear in the right boundary', () => {
+         let enemy = new Enemy(Game.col(5), Game.row(2), Speed.NORMAL)
+
+         enemy.update(1)
+
+         expect(enemy.speed).to.equal(400)
+         expect(enemy.x).to.equal(Math.abs(Game.col(6) - Game.col(5) - 400))
+      })
    })
 
    describe('collision detection', () => {