Add native image resize tests

spec/api-native-image-spec.js

@@ -1,7 +1,7 @@
 'use strict'
 
 const assert = require('assert')
-const nativeImage = require('electron').nativeImage
+const {nativeImage} = require('electron')
 const path = require('path')
 
 describe('nativeImage module', () => {
@@ -61,4 +61,23 @@ describe('nativeImage module', () => {
       assert.equal(image.getSize().width, 256)
     })
   })
+
+  describe('resize(options)', () => {
+    it('returns a resized image', () => {
+      const image = nativeImage.createFromPath(path.join(__dirname, 'fixtures', 'assets', 'logo.png'))
+      assert.deepEqual(image.resize({}).getSize(), {width: 538, height: 190})
+      assert.deepEqual(image.resize({width: 400}).getSize(), {width: 400, height: 190})
+      assert.deepEqual(image.resize({height: 123}).getSize(), {width: 538, height: 123})
+      assert.deepEqual(image.resize({width: 80, height: 65}).getSize(), {width: 80, height: 65})
+    })
+
+    it('supports a quality option', () => {
+      const image = nativeImage.createFromPath(path.join(__dirname, 'fixtures', 'assets', 'logo.png'))
+      const good = image.resize({width: 100, height: 100, quality: 'good'})
+      const better = image.resize({width: 100, height: 100, quality: 'better'})
+      const best = image.resize({width: 100, height: 100, quality: 'best'})
+      assert(good.toPNG().length <= better.toPNG().length)
+      assert(better.toPNG().length < best.toPNG().length)
+    })
+  })
 })