title: Karma is not finding my spec.ts file tests
body: <p>I have the following <code>karma.config.js</code> that is based on <a href="https://karma-runner.github.io/1.0/config/configuration-file.html" rel="nofollow noreferrer">this</a></p>
  
  <pre><code>module.exports = function (config) {
    config.set({
      basePath: '',
      files: ['**/*spec.ts'],
      frameworks: ['jasmine'],
      plugins: [
        require('karma-jasmine'),
        require('karma-chrome-launcher'),
        require('karma-jasmine-html-reporter'),
        require('karma-coverage-istanbul-reporter')
      ],
      client: {
        clearContext: false // leave Jasmine Spec Runner output visible in browser
      },
      coverageIstanbulReporter: {
        dir: require('path').join(__dirname, '../coverage'),
        reports: ['html', 'lcovonly'],
        fixWebpackSourcePaths: true
      },
      reporters: ['progress', 'kjhtml'],
      port: 9876,
      colors: true,
      logLevel: config.LOG_INFO,
      autoWatch: true,
      browsers: ['Chrome'],
      singleRun: false
    });
  };
  </code></pre>
  
  <p>I can not understand why that the report says that there was execute 0 tests. I'm sure that I have some files in my src folder that has the <code>spec.ts</code> extension.</p>
  
  <blockquote>
    <p>Chrome 68.0.3440 (Windows 10.0.0): Executed 0 of 0 ERROR (0.079 secs / 0 secs)</p>
  </blockquote>
  
  <p>Any one has any idea what may be the issue?</p>