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scripts/test.js

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+process.env.NODE_ENV = 'test';
+process.env.PUBLIC_URL = '';
+
+// Load environment variables from .env file. Suppress warnings using silent
+// if this file is missing. dotenv will never modify any environment variables
+// that have already been set.
+// https://github.com/motdotla/dotenv
+require('dotenv').config({silent: true});
+
+const jest = require('jest');
+const argv = process.argv.slice(2);
+
+// Watch unless on CI or in coverage mode
+if (!process.env.CI && argv.indexOf('--coverage') < 0) {
+  argv.push('--watch');
+}
+
+// A temporary hack to clear terminal correctly.
+// You can remove this after updating to Jest 18 when it's out.
+// https://github.com/facebook/jest/pull/2230
+var realWrite = process.stdout.write;
+var CLEAR = process.platform === 'win32' ? '\x1Bc' : '\x1B[2J\x1B[3J\x1B[H';
+process.stdout.write = function(chunk, encoding, callback) {
+  if (chunk === '\x1B[2J\x1B[H') {
+    chunk = CLEAR;
+  }
+  return realWrite.call(this, chunk, encoding, callback);
+};
+
+
+jest.run(argv);