gistfile1.php

<?php

  /**
   * @BeforeScenario
   */
  public function captureConsoleLog() {
    if (!($this->getSession()->getDriver() instanceof \Behat\Mink\Driver\Selenium2Driver)) {
      // Not a Selenium driver (e.g. PhantomJs).
      return;
    }

    $script = <<<JS
(function(){
    window.consoleLogs = [];
    if (window.console && console.log) {
        var old = console.log;
        console.log = function() {
            window.consoleLogs.push(arguments);
            old.apply(this, arguments)
        }
    }
})();
JS;

    $this->getSession()->getDriver()->executeScript($script);
  }

  /**
   * @AfterScenario
   */
  public function getcaptureDConsoleLogs() {
    if (!($this->getSession()->getDriver() instanceof \Behat\Mink\Driver\Selenium2Driver)) {
      // Not a Selenium driver (e.g. PhantomJs).
      return;
    }

    $script = <<<JS
(function(){
  return window.consoleLogs;
})();
JS;

    $logs = $this->getSession()->getDriver()->executeScript($script);
    print $logs;
  }