Configure jest -- fix a few common issues

jest.config.js

@@ -0,0 +1,21 @@
+module.exports = {
+  verbose: true,
+  testPathIgnorePatterns: ['<rootDir>/node_modules/'],
+  testMatch: ['<rootDir>/src/**/*.test.js'],
+  //
+  collectCoverage: false,
+  collectCoverageFrom: [
+    '**/*.{js,jsx}',
+    '!**/node_modules/**',
+    '!<rootDir>/dist/**',
+  ],
+  reporters: ['default', 'jest-junit'],
+  //
+  moduleNameMapper: {
+    '\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
+      '<rootDir>/src/__mocks__/fileMock.js',
+    '\\.(css|less)$': 'identity-obj-proxy',
+  },
+  setupFiles: ['<rootDir>/node_modules/jest-canvas-mock/lib/index.js'],
+  setupTestFrameworkScriptFile: '<rootDir>/src/__tests__/globalSetup.js',
+}