Fix lint

Author: mnightingale

tests/CacheableImage.test.js

@@ -1,5 +1,5 @@
 // Define globals for eslint.
-/* global describe it jest */
+/* global expect describe it jest */
 
 // Load dependencies
 import should from 'should'; // eslint-disable-line no-unused-vars

tests/__mocks__/rn-fetch-blob.js

@@ -1,3 +1,4 @@
+/* global jest */
 const { mockData } = require('../mockData');
 
 module.exports = {