basic image preloading

test/comic-book.test.js

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+let assert = require('assert')
+let ComicBook = require('../app/comic-book')
+let srcs = [
+    'data:image/gif;base64,R0lGODlhAQABAPAAAKqqqv///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==',
+    'data:image/gif;base64,R0lGODlhAQABAPAAALu7u////yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==',
+    'data:image/gif;base64,R0lGODlhAQABAPAAAMzMzP///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==',
+    'data:image/gif;base64,R0lGODlhAQABAPAAAN3d3f///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==',
+    'data:image/gif;base64,R0lGODlhAQABAPAAAO7u7v///yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw=='
+  ]
+
+describe('ComicBook', function () {
+
+  describe('preload images', function () {
+
+    it('should preload all given image srcs and emit preload:image, preload:finish events', function (done) {
+      let comic = new ComicBook(srcs)
+      let loaded = []
+
+      comic.on('preload:image', image => loaded.push(image.src))
+
+      comic.on('preload:finish', function () {
+        assert.deepEqual(loaded, srcs, 'all requested images should have been loaded')
+        done()
+      })
+
+      comic.preload()
+    })
+
+    it('should only load a given amount of images at a time')
+
+    it('should preload images in both directions')
+
+    it('should emit a preload:start event', function (done) {
+      let comic = new ComicBook(srcs)
+
+      comic.on('preload:start', function () {
+        assert(true)
+        done()
+      })
+
+      comic.preload()
+    })
+
+    it('should emit a preload:ready event')
+
+    it('preload:ready should make sure that double page mode can show two images')
+  })
+})