fix(test): add polyfill

tests/unit/setup.js

@@ -50,3 +50,16 @@ global.cancelAnimationFrame = function(id) {
 require('jsdom-global')(undefined, {
     pretendToBeVisual: true
 })
+//fake
+HTMLCanvasElement.prototype.getContext = function getContext() {
+    return {}
+}
+window.Date = Date
+localStorage = {
+    getItem: function(key) {
+        return this[key]
+    },
+    setItem: function(key, value) {
+        this[key] = value
+    }
+}