title: Your test suite must contain at least one test
body: <p>I have updated some of the dependencies today in my project, but it went through really smoothly. Now, when I'm about to push it, I started my tests. And boom. All of them throw:</p>
  
  <p><code>Your test suite must contain at least one test.</code></p>
  
  <p>My packages:</p>
  
  <pre><code>"jest": "23.1.0",
  "jest-enzyme": "^6.0.1",
  "jest-webpack-alias": "^3.3.3",
  "jsdom": "^11.2.0",
  "jsdom-global": "^3.0.2",
  "enzyme": "3.3.0",
  "enzyme-adapter-react-16": "^1.1.0",
  "enzyme-to-json": "3.3.4",
  </code></pre>
  
  <p>And that is how my sample test file looks like:</p>
  
  <p><strong>/shared/components/App/MyRoute/__tests__/MyRoute.test.js</strong></p>
  
  <pre><code>/* eslint-disable import/no-extraneous-dependencies */
  import React from 'react';
  import { shallow } from 'enzyme';
  import { ContactsRoute } from '../Route';
  
  describe('&lt;ContactsRoute /&gt;', () =&gt; {
    test('renders', () =&gt; {
      const wrapper = shallow(&lt;ContactsRoute t={key =&gt; key} /&gt;);
      expect(wrapper).toMatchSnapshot();
    });
  });
  </code></pre>
  
  <p>I have no idea why they stopped running so suddenly?</p>
  
  <p><strong>Edit - adding my jest config</strong></p>
  
  <pre><code>  "jest": {
  "collectCoverageFrom": [
    "shared/**/*.{js,jsx}"
  ],
  "globals": {
    "JWT_SECRET": "local",
    "IS_TEST": "true"
  },
  "snapshotSerializers": [
    "&lt;rootDir&gt;/node_modules/enzyme-to-json/serializer"
  ],
  "testPathIgnorePatterns": [
    "&lt;rootDir&gt;/(build|internal|node_modules|flow-typed|public|shared/services)/"
  ],
  "moduleNameMapper": {
    "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$": "&lt;rootDir&gt;/_test_config_/mocks/fileMock.js"
  },
  "testURL": "http://localhost:3005",
  "transform": {
    ".": "&lt;rootDir&gt;/_test_config_/preprocessors/webpackAlias.js",
    "^.+\\.css$": "&lt;rootDir&gt;/_test_config_/preprocessors/cssTransform.js",
    "^(?!.*\\.(js|jsx|css|json)$)": "&lt;rootDir&gt;/_test_config_/preprocessors/fileTransform.js"
  },
  "setupFiles": [
    "&lt;rootDir&gt;/_test_config_/preprocessors/polyfills.js"
  ],
  "setupTestFrameworkScriptFile": "./node_modules/jest-enzyme/lib/index.js"
  },
  </code></pre>