comparison vendor/behat/mink-selenium2-driver/src/Selenium2Driver.php @ 14:1fec387a4317

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+<?php
+
+/*
+ * This file is part of the Behat\Mink.
+ * (c) Konstantin Kudryashov <[e-mail]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Mink\Driver;
+
+use Behat\Mink\Exception\DriverException;
+use Behat\Mink\Selector\Xpath\Escaper;
+use WebDriver\Element;
+use WebDriver\Exception\NoSuchElement;
+use WebDriver\Exception\UnknownCommand;
+use WebDriver\Exception\UnknownError;
+use WebDriver\Exception;
+use WebDriver\Key;
+use WebDriver\WebDriver;
+
+/**
+ * Selenium2 driver.
+ *
+ * @author Pete Otaqui <[e-mail]>
+ */
+class Selenium2Driver extends CoreDriver
+{
+    /**
+     * Whether the browser has been started
+     * @var Boolean
+     */
+    private $started = false;
+
+    /**
+     * The WebDriver instance
+     * @var WebDriver
+     */
+    private $webDriver;
+
+    /**
+     * @var string
+     */
+    private $browserName;
+
+    /**
+     * @var array
+     */
+    private $desiredCapabilities;
+
+    /**
+     * The WebDriverSession instance
+     * @var \WebDriver\Session
+     */
+    private $wdSession;
+
+    /**
+     * The timeout configuration
+     * @var array
+     */
+    private $timeouts = array();
+
+    /**
+     * @var Escaper
+     */
+    private $xpathEscaper;
+
+    /**
+     * Instantiates the driver.
+     *
+     * @param string $browserName         Browser name
+     * @param array  $desiredCapabilities The desired capabilities
+     * @param string $wdHost              The WebDriver host
+     */
+    public function __construct($browserName = 'firefox', $desiredCapabilities = null, $wdHost = 'http://localhost:4444/wd/hub')
+    {
+        $this->setBrowserName($browserName);
+        $this->setDesiredCapabilities($desiredCapabilities);
+        $this->setWebDriver(new WebDriver($wdHost));
+        $this->xpathEscaper = new Escaper();
+    }
+
+    /**
+     * Sets the browser name
+     *
+     * @param string $browserName the name of the browser to start, default is 'firefox'
+     */
+    protected function setBrowserName($browserName = 'firefox')
+    {
+        $this->browserName = $browserName;
+    }
+
+    /**
+     * Sets the desired capabilities - called on construction.  If null is provided, will set the
+     * defaults as desired.
+     *
+     * See http://code.google.com/p/selenium/wiki/DesiredCapabilities
+     *
+     * @param array $desiredCapabilities an array of capabilities to pass on to the WebDriver server
+     *
+     * @throws DriverException
+     */
+    public function setDesiredCapabilities($desiredCapabilities = null)
+    {
+        if ($this->started) {
+            throw new DriverException("Unable to set desiredCapabilities, the session has already started");
+        }
+
+        if (null === $desiredCapabilities) {
+            $desiredCapabilities = array();
+        }
+
+        // Join $desiredCapabilities with defaultCapabilities
+        $desiredCapabilities = array_replace(self::getDefaultCapabilities(), $desiredCapabilities);
+
+        if (isset($desiredCapabilities['firefox'])) {
+            foreach ($desiredCapabilities['firefox'] as $capability => $value) {
+                switch ($capability) {
+                    case 'profile':
+                        $desiredCapabilities['firefox_'.$capability] = base64_encode(file_get_contents($value));
+                        break;
+                    default:
+                        $desiredCapabilities['firefox_'.$capability] = $value;
+                }
+            }
+
+            unset($desiredCapabilities['firefox']);
+        }
+
+        // See https://sites.google.com/a/chromium.org/chromedriver/capabilities
+        if (isset($desiredCapabilities['chrome'])) {
+
+            $chromeOptions = array();
+
+            foreach ($desiredCapabilities['chrome'] as $capability => $value) {
+                if ($capability == 'switches') {
+                    $chromeOptions['args'] = $value;
+                } else {
+                    $chromeOptions[$capability] = $value;
+                }
+                $desiredCapabilities['chrome.'.$capability] = $value;
+            }
+
+            $desiredCapabilities['chromeOptions'] = $chromeOptions;
+
+            unset($desiredCapabilities['chrome']);
+        }
+
+        $this->desiredCapabilities = $desiredCapabilities;
+    }
+
+    /**
+     * Gets the desiredCapabilities
+     *
+     * @return array $desiredCapabilities
+     */
+    public function getDesiredCapabilities()
+    {
+        return $this->desiredCapabilities;
+    }
+
+    /**
+     * Sets the WebDriver instance
+     *
+     * @param WebDriver $webDriver An instance of the WebDriver class
+     */
+    public function setWebDriver(WebDriver $webDriver)
+    {
+        $this->webDriver = $webDriver;
+    }
+
+    /**
+     * Gets the WebDriverSession instance
+     *
+     * @return \WebDriver\Session
+     */
+    public function getWebDriverSession()
+    {
+        return $this->wdSession;
+    }
+
+    /**
+     * Returns the default capabilities
+     *
+     * @return array
+     */
+    public static function getDefaultCapabilities()
+    {
+        return array(
+            'browserName'       => 'firefox',
+            'version'           => '9',
+            'platform'          => 'ANY',
+            'browserVersion'    => '9',
+            'browser'           => 'firefox',
+            'name'              => 'Behat Test',
+            'deviceOrientation' => 'portrait',
+            'deviceType'        => 'tablet',
+            'selenium-version'  => '2.31.0'
+        );
+    }
+
+    /**
+     * Makes sure that the Syn event library has been injected into the current page,
+     * and return $this for a fluid interface,
+     *
+     *     $this->withSyn()->executeJsOnXpath($xpath, $script);
+     *
+     * @return Selenium2Driver
+     */
+    protected function withSyn()
+    {
+        $hasSyn = $this->wdSession->execute(array(
+            'script' => 'return typeof window["Syn"]!=="undefined" && typeof window["Syn"].trigger!=="undefined"',
+            'args'   => array()
+        ));
+
+        if (!$hasSyn) {
+            $synJs = file_get_contents(__DIR__.'/Resources/syn.js');
+            $this->wdSession->execute(array(
+                'script' => $synJs,
+                'args'   => array()
+            ));
+        }
+
+        return $this;
+    }
+
+    /**
+     * Creates some options for key events
+     *
+     * @param string $char     the character or code
+     * @param string $modifier one of 'shift', 'alt', 'ctrl' or 'meta'
+     *
+     * @return string a json encoded options array for Syn
+     */
+    protected static function charToOptions($char, $modifier = null)
+    {
+        $ord = ord($char);
+        if (is_numeric($char)) {
+            $ord = $char;
+        }
+
+        $options = array(
+            'keyCode'  => $ord,
+            'charCode' => $ord
+        );
+
+        if ($modifier) {
+            $options[$modifier.'Key'] = 1;
+        }
+
+        return json_encode($options);
+    }
+
+    /**
+     * Executes JS on a given element - pass in a js script string and {{ELEMENT}} will
+     * be replaced with a reference to the result of the $xpath query
+     *
+     * @example $this->executeJsOnXpath($xpath, 'return {{ELEMENT}}.childNodes.length');
+     *
+     * @param string  $xpath  the xpath to search with
+     * @param string  $script the script to execute
+     * @param Boolean $sync   whether to run the script synchronously (default is TRUE)
+     *
+     * @return mixed
+     */
+    protected function executeJsOnXpath($xpath, $script, $sync = true)
+    {
+        return $this->executeJsOnElement($this->findElement($xpath), $script, $sync);
+    }
+
+    /**
+     * Executes JS on a given element - pass in a js script string and {{ELEMENT}} will
+     * be replaced with a reference to the element
+     *
+     * @example $this->executeJsOnXpath($xpath, 'return {{ELEMENT}}.childNodes.length');
+     *
+     * @param Element $element the webdriver element
+     * @param string  $script  the script to execute
+     * @param Boolean $sync    whether to run the script synchronously (default is TRUE)
+     *
+     * @return mixed
+     */
+    private function executeJsOnElement(Element $element, $script, $sync = true)
+    {
+        $script  = str_replace('{{ELEMENT}}', 'arguments[0]', $script);
+
+        $options = array(
+            'script' => $script,
+            'args'   => array(array('ELEMENT' => $element->getID())),
+        );
+
+        if ($sync) {
+            return $this->wdSession->execute($options);
+        }
+
+        return $this->wdSession->execute_async($options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function start()
+    {
+        try {
+            $this->wdSession = $this->webDriver->session($this->browserName, $this->desiredCapabilities);
+            $this->applyTimeouts();
+        } catch (\Exception $e) {
+            throw new DriverException('Could not open connection: '.$e->getMessage(), 0, $e);
+        }
+
+        if (!$this->wdSession) {
+            throw new DriverException('Could not connect to a Selenium 2 / WebDriver server');
+        }
+        $this->started = true;
+    }
+
+    /**
+     * Sets the timeouts to apply to the webdriver session
+     *
+     * @param array $timeouts The session timeout settings: Array of {script, implicit, page} => time in milliseconds
+     *
+     * @throws DriverException
+     */
+    public function setTimeouts($timeouts)
+    {
+        $this->timeouts = $timeouts;
+
+        if ($this->isStarted()) {
+            $this->applyTimeouts();
+        }
+    }
+
+    /**
+     * Applies timeouts to the current session
+     */
+    private function applyTimeouts()
+    {
+        try {
+            foreach ($this->timeouts as $type => $param) {
+                $this->wdSession->timeouts($type, $param);
+            }
+        } catch (UnknownError $e) {
+            throw new DriverException('Error setting timeout: ' . $e->getMessage(), 0, $e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isStarted()
+    {
+        return $this->started;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function stop()
+    {
+        if (!$this->wdSession) {
+            throw new DriverException('Could not connect to a Selenium 2 / WebDriver server');
+        }
+
+        $this->started = false;
+        try {
+            $this->wdSession->close();
+        } catch (\Exception $e) {
+            throw new DriverException('Could not close connection', 0, $e);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function reset()
+    {
+        $this->wdSession->deleteAllCookies();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function visit($url)
+    {
+        $this->wdSession->open($url);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCurrentUrl()
+    {
+        return $this->wdSession->url();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function reload()
+    {
+        $this->wdSession->refresh();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function forward()
+    {
+        $this->wdSession->forward();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function back()
+    {
+        $this->wdSession->back();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function switchToWindow($name = null)
+    {
+        $this->wdSession->focusWindow($name ? $name : '');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function switchToIFrame($name = null)
+    {
+        $this->wdSession->frame(array('id' => $name));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setCookie($name, $value = null)
+    {
+        if (null === $value) {
+            $this->wdSession->deleteCookie($name);
+
+            return;
+        }
+
+        $cookieArray = array(
+            'name'   => $name,
+            'value'  => urlencode($value),
+            'secure' => false, // thanks, chibimagic!
+        );
+
+        $this->wdSession->setCookie($cookieArray);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCookie($name)
+    {
+        $cookies = $this->wdSession->getAllCookies();
+        foreach ($cookies as $cookie) {
+            if ($cookie['name'] === $name) {
+                return urldecode($cookie['value']);
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getContent()
+    {
+        return $this->wdSession->source();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getScreenshot()
+    {
+        return base64_decode($this->wdSession->screenshot());
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getWindowNames()
+    {
+        return $this->wdSession->window_handles();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getWindowName()
+    {
+        return $this->wdSession->window_handle();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function findElementXpaths($xpath)
+    {
+        $nodes = $this->wdSession->elements('xpath', $xpath);
+
+        $elements = array();
+        foreach ($nodes as $i => $node) {
+            $elements[] = sprintf('(%s)[%d]', $xpath, $i+1);
+        }
+
+        return $elements;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTagName($xpath)
+    {
+        return $this->findElement($xpath)->name();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getText($xpath)
+    {
+        $node = $this->findElement($xpath);
+        $text = $node->text();
+        $text = (string) str_replace(array("\r", "\r\n", "\n"), ' ', $text);
+
+        return $text;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getHtml($xpath)
+    {
+        return $this->executeJsOnXpath($xpath, 'return {{ELEMENT}}.innerHTML;');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getOuterHtml($xpath)
+    {
+        return $this->executeJsOnXpath($xpath, 'return {{ELEMENT}}.outerHTML;');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getAttribute($xpath, $name)
+    {
+        $script = 'return {{ELEMENT}}.getAttribute(' . json_encode((string) $name) . ')';
+
+        return $this->executeJsOnXpath($xpath, $script);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getValue($xpath)
+    {
+        $element = $this->findElement($xpath);
+        $elementName = strtolower($element->name());
+        $elementType = strtolower($element->attribute('type'));
+
+        // Getting the value of a checkbox returns its value if selected.
+        if ('input' === $elementName && 'checkbox' === $elementType) {
+            return $element->selected() ? $element->attribute('value') : null;
+        }
+
+        if ('input' === $elementName && 'radio' === $elementType) {
+            $script = <<<JS
+var node = {{ELEMENT}},
+    value = null;
+
+var name = node.getAttribute('name');
+if (name) {
+    var fields = window.document.getElementsByName(name),
+        i, l = fields.length;
+    for (i = 0; i < l; i++) {
+        var field = fields.item(i);
+        if (field.form === node.form && field.checked) {
+            value = field.value;
+            break;
+        }
+    }
+}
+
+return value;
+JS;
+
+            return $this->executeJsOnElement($element, $script);
+        }
+
+        // Using $element->attribute('value') on a select only returns the first selected option
+        // even when it is a multiple select, so a custom retrieval is needed.
+        if ('select' === $elementName && $element->attribute('multiple')) {
+            $script = <<<JS
+var node = {{ELEMENT}},
+    value = [];
+
+for (var i = 0; i < node.options.length; i++) {
+    if (node.options[i].selected) {
+        value.push(node.options[i].value);
+    }
+}
+
+return value;
+JS;
+
+            return $this->executeJsOnElement($element, $script);
+        }
+
+        return $element->attribute('value');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setValue($xpath, $value)
+    {
+        $element = $this->findElement($xpath);
+        $elementName = strtolower($element->name());
+
+        if ('select' === $elementName) {
+            if (is_array($value)) {
+                $this->deselectAllOptions($element);
+
+                foreach ($value as $option) {
+                    $this->selectOptionOnElement($element, $option, true);
+                }
+
+                return;
+            }
+
+            $this->selectOptionOnElement($element, $value);
+
+            return;
+        }
+
+        if ('input' === $elementName) {
+            $elementType = strtolower($element->attribute('type'));
+
+            if (in_array($elementType, array('submit', 'image', 'button', 'reset'))) {
+                throw new DriverException(sprintf('Impossible to set value an element with XPath "%s" as it is not a select, textarea or textbox', $xpath));
+            }
+
+            if ('checkbox' === $elementType) {
+                if ($element->selected() xor (bool) $value) {
+                    $this->clickOnElement($element);
+                }
+
+                return;
+            }
+
+            if ('radio' === $elementType) {
+                $this->selectRadioValue($element, $value);
+
+                return;
+            }
+
+            if ('file' === $elementType) {
+                $element->postValue(array('value' => array(strval($value))));
+
+                return;
+            }
+        }
+
+        $value = strval($value);
+
+        if (in_array($elementName, array('input', 'textarea'))) {
+            $existingValueLength = strlen($element->attribute('value'));
+            // Add the TAB key to ensure we unfocus the field as browsers are triggering the change event only
+            // after leaving the field.
+            $value = str_repeat(Key::BACKSPACE . Key::DELETE, $existingValueLength) . $value;
+        }
+
+        $element->postValue(array('value' => array($value)));
+        $this->trigger($xpath, 'change');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function check($xpath)
+    {
+        $element = $this->findElement($xpath);
+        $this->ensureInputType($element, $xpath, 'checkbox', 'check');
+
+        if ($element->selected()) {
+            return;
+        }
+
+        $this->clickOnElement($element);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function uncheck($xpath)
+    {
+        $element = $this->findElement($xpath);
+        $this->ensureInputType($element, $xpath, 'checkbox', 'uncheck');
+
+        if (!$element->selected()) {
+            return;
+        }
+
+        $this->clickOnElement($element);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isChecked($xpath)
+    {
+        return $this->findElement($xpath)->selected();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function selectOption($xpath, $value, $multiple = false)
+    {
+        $element = $this->findElement($xpath);
+        $tagName = strtolower($element->name());
+
+        if ('input' === $tagName && 'radio' === strtolower($element->attribute('type'))) {
+            $this->selectRadioValue($element, $value);
+
+            return;
+        }
+
+        if ('select' === $tagName) {
+            $this->selectOptionOnElement($element, $value, $multiple);
+
+            return;
+        }
+
+        throw new DriverException(sprintf('Impossible to select an option on the element with XPath "%s" as it is not a select or radio input', $xpath));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isSelected($xpath)
+    {
+        return $this->findElement($xpath)->selected();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function click($xpath)
+    {
+        $this->clickOnElement($this->findElement($xpath));
+    }
+
+    private function clickOnElement(Element $element)
+    {
+        try {
+            // Move the mouse to the element as Selenium does not allow clicking on an element which is outside the viewport
+            $this->wdSession->moveto(array('element' => $element->getID()));
+        } catch (UnknownCommand $e) {
+            // If the Webdriver implementation does not support moveto (which is not part of the W3C WebDriver spec), proceed to the click
+        }
+
+        $element->click();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function doubleClick($xpath)
+    {
+        $this->mouseOver($xpath);
+        $this->wdSession->doubleclick();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function rightClick($xpath)
+    {
+        $this->mouseOver($xpath);
+        $this->wdSession->click(array('button' => 2));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function attachFile($xpath, $path)
+    {
+        $element = $this->findElement($xpath);
+        $this->ensureInputType($element, $xpath, 'file', 'attach a file on');
+
+        // Upload the file to Selenium and use the remote path. This will
+        // ensure that Selenium always has access to the file, even if it runs
+        // as a remote instance.
+        try {
+          $remotePath = $this->uploadFile($path);
+        } catch (\Exception $e) {
+          // File could not be uploaded to remote instance. Use the local path.
+          $remotePath = $path;
+        }
+
+        $element->postValue(array('value' => array($remotePath)));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isVisible($xpath)
+    {
+        return $this->findElement($xpath)->displayed();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function mouseOver($xpath)
+    {
+        $this->wdSession->moveto(array(
+            'element' => $this->findElement($xpath)->getID()
+        ));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function focus($xpath)
+    {
+        $this->trigger($xpath, 'focus');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function blur($xpath)
+    {
+        $this->trigger($xpath, 'blur');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function keyPress($xpath, $char, $modifier = null)
+    {
+        $options = self::charToOptions($char, $modifier);
+        $this->trigger($xpath, 'keypress', $options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function keyDown($xpath, $char, $modifier = null)
+    {
+        $options = self::charToOptions($char, $modifier);
+        $this->trigger($xpath, 'keydown', $options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function keyUp($xpath, $char, $modifier = null)
+    {
+        $options = self::charToOptions($char, $modifier);
+        $this->trigger($xpath, 'keyup', $options);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function dragTo($sourceXpath, $destinationXpath)
+    {
+        $source      = $this->findElement($sourceXpath);
+        $destination = $this->findElement($destinationXpath);
+
+        $this->wdSession->moveto(array(
+            'element' => $source->getID()
+        ));
+
+        $script = <<<JS
+(function (element) {
+    var event = document.createEvent("HTMLEvents");
+
+    event.initEvent("dragstart", true, true);
+    event.dataTransfer = {};
+
+    element.dispatchEvent(event);
+}({{ELEMENT}}));
+JS;
+        $this->withSyn()->executeJsOnElement($source, $script);
+
+        $this->wdSession->buttondown();
+        $this->wdSession->moveto(array(
+            'element' => $destination->getID()
+        ));
+        $this->wdSession->buttonup();
+
+        $script = <<<JS
+(function (element) {
+    var event = document.createEvent("HTMLEvents");
+
+    event.initEvent("drop", true, true);
+    event.dataTransfer = {};
+
+    element.dispatchEvent(event);
+}({{ELEMENT}}));
+JS;
+        $this->withSyn()->executeJsOnElement($destination, $script);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function executeScript($script)
+    {
+        if (preg_match('/^function[\s\(]/', $script)) {
+            $script = preg_replace('/;$/', '', $script);
+            $script = '(' . $script . ')';
+        }
+
+        $this->wdSession->execute(array('script' => $script, 'args' => array()));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function evaluateScript($script)
+    {
+        if (0 !== strpos(trim($script), 'return ')) {
+            $script = 'return ' . $script;
+        }
+
+        return $this->wdSession->execute(array('script' => $script, 'args' => array()));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function wait($timeout, $condition)
+    {
+        $script = "return $condition;";
+        $start = microtime(true);
+        $end = $start + $timeout / 1000.0;
+
+        do {
+            $result = $this->wdSession->execute(array('script' => $script, 'args' => array()));
+            usleep(100000);
+        } while (microtime(true) < $end && !$result);
+
+        return (bool) $result;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function resizeWindow($width, $height, $name = null)
+    {
+        $this->wdSession->window($name ? $name : 'current')->postSize(
+            array('width' => $width, 'height' => $height)
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function submitForm($xpath)
+    {
+        $this->findElement($xpath)->submit();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function maximizeWindow($name = null)
+    {
+        $this->wdSession->window($name ? $name : 'current')->maximize();
+    }
+
+    /**
+     * Returns Session ID of WebDriver or `null`, when session not started yet.
+     *
+     * @return string|null
+     */
+    public function getWebDriverSessionId()
+    {
+        return $this->isStarted() ? basename($this->wdSession->getUrl()) : null;
+    }
+
+    /**
+     * @param string $xpath
+     *
+     * @return Element
+     */
+    private function findElement($xpath)
+    {
+        return $this->wdSession->element('xpath', $xpath);
+    }
+
+    /**
+     * Selects a value in a radio button group
+     *
+     * @param Element $element An element referencing one of the radio buttons of the group
+     * @param string  $value   The value to select
+     *
+     * @throws DriverException when the value cannot be found
+     */
+    private function selectRadioValue(Element $element, $value)
+    {
+        // short-circuit when we already have the right button of the group to avoid XPath queries
+        if ($element->attribute('value') === $value) {
+            $element->click();
+
+            return;
+        }
+
+        $name = $element->attribute('name');
+
+        if (!$name) {
+            throw new DriverException(sprintf('The radio button does not have the value "%s"', $value));
+        }
+
+        $formId = $element->attribute('form');
+
+        try {
+            if (null !== $formId) {
+                $xpath = <<<'XPATH'
+//form[@id=%1$s]//input[@type="radio" and not(@form) and @name=%2$s and @value = %3$s]
+|
+//input[@type="radio" and @form=%1$s and @name=%2$s and @value = %3$s]
+XPATH;
+
+                $xpath = sprintf(
+                    $xpath,
+                    $this->xpathEscaper->escapeLiteral($formId),
+                    $this->xpathEscaper->escapeLiteral($name),
+                    $this->xpathEscaper->escapeLiteral($value)
+                );
+                $input = $this->wdSession->element('xpath', $xpath);
+            } else {
+                $xpath = sprintf(
+                    './ancestor::form//input[@type="radio" and not(@form) and @name=%s and @value = %s]',
+                    $this->xpathEscaper->escapeLiteral($name),
+                    $this->xpathEscaper->escapeLiteral($value)
+                );
+                $input = $element->element('xpath', $xpath);
+            }
+        } catch (NoSuchElement $e) {
+            $message = sprintf('The radio group "%s" does not have an option "%s"', $name, $value);
+
+            throw new DriverException($message, 0, $e);
+        }
+
+        $input->click();
+    }
+
+    /**
+     * @param Element $element
+     * @param string  $value
+     * @param bool    $multiple
+     */
+    private function selectOptionOnElement(Element $element, $value, $multiple = false)
+    {
+        $escapedValue = $this->xpathEscaper->escapeLiteral($value);
+        // The value of an option is the normalized version of its text when it has no value attribute
+        $optionQuery = sprintf('.//option[@value = %s or (not(@value) and normalize-space(.) = %s)]', $escapedValue, $escapedValue);
+        $option = $element->element('xpath', $optionQuery);
+
+        if ($multiple || !$element->attribute('multiple')) {
+            if (!$option->selected()) {
+                $option->click();
+            }
+
+            return;
+        }
+
+        // Deselect all options before selecting the new one
+        $this->deselectAllOptions($element);
+        $option->click();
+    }
+
+    /**
+     * Deselects all options of a multiple select
+     *
+     * Note: this implementation does not trigger a change event after deselecting the elements.
+     *
+     * @param Element $element
+     */
+    private function deselectAllOptions(Element $element)
+    {
+        $script = <<<JS
+var node = {{ELEMENT}};
+var i, l = node.options.length;
+for (i = 0; i < l; i++) {
+    node.options[i].selected = false;
+}
+JS;
+
+        $this->executeJsOnElement($element, $script);
+    }
+
+    /**
+     * Ensures the element is a checkbox
+     *
+     * @param Element $element
+     * @param string  $xpath
+     * @param string  $type
+     * @param string  $action
+     *
+     * @throws DriverException
+     */
+    private function ensureInputType(Element $element, $xpath, $type, $action)
+    {
+        if ('input' !== strtolower($element->name()) || $type !== strtolower($element->attribute('type'))) {
+            $message = 'Impossible to %s the element with XPath "%s" as it is not a %s input';
+
+            throw new DriverException(sprintf($message, $action, $xpath, $type));
+        }
+    }
+
+    /**
+     * @param $xpath
+     * @param $event
+     * @param string $options
+     */
+    private function trigger($xpath, $event, $options = '{}')
+    {
+        $script = 'Syn.trigger("' . $event . '", ' . $options . ', {{ELEMENT}})';
+        $this->withSyn()->executeJsOnXpath($xpath, $script);
+    }
+
+    /**
+     * Uploads a file to the Selenium instance.
+     *
+     * Note that uploading files is not part of the official WebDriver
+     * specification, but it is supported by Selenium.
+     *
+     * @param string $path     The path to the file to upload.
+     *
+     * @return string          The remote path.
+     *
+     * @throws DriverException When PHP is compiled without zip support, or the file doesn't exist.
+     * @throws UnknownError    When an unknown error occurred during file upload.
+     * @throws \Exception      When a known error occurred during file upload.
+     *
+     * @see https://github.com/SeleniumHQ/selenium/blob/master/py/selenium/webdriver/remote/webelement.py#L533
+     */
+    private function uploadFile($path)
+    {
+        if (!is_file($path)) {
+          throw new DriverException('File does not exist locally and cannot be uploaded to the remote instance.');
+        }
+
+        if (!class_exists('ZipArchive')) {
+          throw new DriverException('Could not compress file, PHP is compiled without zip support.');
+        }
+
+        // Selenium only accepts uploads that are compressed as a Zip archive.
+        $tempFilename = tempnam('', 'WebDriverZip');
+
+        $archive = new \ZipArchive();
+        $result = $archive->open($tempFilename, \ZipArchive::CREATE);
+        if (!$result) {
+          throw new DriverException('Zip archive could not be created. Error ' . $result);
+        }
+        $result = $archive->addFile($path, basename($path));
+        if (!$result) {
+          throw new DriverException('File could not be added to zip archive.');
+        }
+        $result = $archive->close();
+        if (!$result) {
+          throw new DriverException('Zip archive could not be closed.');
+        }
+
+        try {
+          $remotePath = $this->wdSession->file(array('file' => base64_encode(file_get_contents($tempFilename))));
+
+          // If no path is returned the file upload failed silently. In this
+          // case it is possible Selenium was not used but another web driver
+          // such as PhantomJS.
+          // @todo Support other drivers when (if) they get remote file transfer
+          // capability.
+          if (empty($remotePath)) {
+            throw new UnknownError();
+          }
+        } catch (\Exception $e) {
+          // Catch any error so we can still clean up the temporary archive.
+        }
+
+        unlink($tempFilename);
+
+        if (isset($e)) {
+          throw $e;
+        }
+
+        return $remotePath;
+    }
+
+}