merging with react branch

src/__mocks__/fileMock.js

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+// https://jestjs.io/docs/en/webpack#handling-static-assets
+
+module.exports = 'test-file-stub'

src/__tests__/globalSetup.js

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+const _ = require('lodash')
+const originalConsoleError = console.error
+
+// JSDom's CSS Parser has limited support for certain features
+// This supresses error warnings caused by it
+console.error = function(msg) {
+  if (_.startsWith(msg, 'Error: Could not parse CSS stylesheet')) return
+  originalConsoleError(msg)
+}

src/sanity.test.js

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+describe('Sanity Test', () => {
+  test('how many marbles?', () => {
+    const expectedMarbles = 4
+    const actualMarbles = 2 + 2
+
+    expect(actualMarbles).toEqual(expectedMarbles)
+  })
+})