test: fixing broken tests

.babelrc

@@ -0,0 +1,10 @@
+{
+  "presets": [
+    ["@babel/preset-env", {
+      "targets": {
+        "browsers": ["last 2 versions"]
+      }
+    }],
+    "@babel/preset-react"
+  ]
+}

jest.config.js

@@ -1,8 +1,21 @@
-const config = require('../../jest.config');
+const path = require('path');
 
 module.exports = {
-  ...config,
-  rootDir: './',
   coveragePathIgnorePatterns: ['<rootDir>/__tests__/__fixtures__/'],
+  collectCoverageFrom: [
+    '**/*.{js,jsx}',
+    '!lib/*.js',
+    '!**/node_modules/**',
+    '!jest.config.js',
+    '!**/coverage/lcov-report/**',
+  ],
+  setupFiles: [path.join(__dirname, '/lib/enzyme')],
   testPathIgnorePatterns: ['<rootDir>/__tests__/__fixtures__/'],
+  transform: {
+    '^.+\\.jsx?$': path.join(__dirname, '/lib/babel-jest'),
+  },
+  transformIgnorePatterns: [
+    // Since `@readme/variable` doesn't ship any transpiled code, we need to transform it as we're running tests.
+    '<rootDir>/node_modules/@readme/variable/^.+\\.jsx?$',
+  ],
 };

lib/babel-jest.js

@@ -0,0 +1,6 @@
+/* eslint import/no-extraneous-dependencies: ["error", {"devDependencies": true }] */
+const babelJest = require('babel-jest');
+const path = require('path');
+const babelRc = JSON.parse(require('fs').readFileSync(path.join(__dirname, '..', '.babelrc'), 'utf8'));
+
+module.exports = babelJest.createTransformer(babelRc);

lib/enzyme.js

@@ -0,0 +1,7 @@
+/* eslint-disable import/no-extraneous-dependencies */
+const Adapter = require('enzyme-adapter-react-16');
+const enzyme = require('enzyme');
+
+require('babel-polyfill');
+
+enzyme.configure({ adapter: new Adapter() });