Add shim for canvas context

Author: michaeldzjap

package-lock.json

@@ -35,7 +35,7 @@
         "babel-core": "^7.0.0-bridge.0",
         "babel-eslint": "^10.0.1",
         "babel-jest": "^23.6.0",
-        "canvas-prebuilt": "^1.6.11",
+        "canvas-prebuilt": "^2.0.0-alpha.14",
         "enzyme": "^3.6.0",
         "enzyme-adapter-react-16": "^1.5.0",
         "eslint": "^5.6.1",

package.json

@@ -1 +1,6 @@
 global.requestAnimationFrame = callback => setTimeout(callback, 0);
+
+HTMLCanvasElement.prototype.getContext = () => ({
+    clearRect: () => {},
+    fillRect: () => {}
+});