mirror of
https://github.com/moodle/moodle.git
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28abad1ab2
Also changing from SeleniumDriver checking to GoutteDriver as is less probably to change goutte than to change selenium.
418 lines
17 KiB
PHP
418 lines
17 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Base class of all steps definitions.
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*
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* This script is only called from Behat as part of it's integration
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* in Moodle.
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*
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* @package core
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* @category test
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* @copyright 2012 David Monllaó
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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// NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.
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use Behat\Mink\Exception\ExpectationException as ExpectationException,
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Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException;
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/**
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* Steps definitions base class.
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*
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* To extend by the steps definitions of the different Moodle components.
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*
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* It can not contain steps definitions to avoid duplicates, only utility
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* methods shared between steps.
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*
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* @package core
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* @category test
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* @copyright 2012 David Monllaó
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class behat_base extends Behat\MinkExtension\Context\RawMinkContext {
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/**
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* The timeout for each Behat step (load page, wait for an element to load...).
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*/
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const TIMEOUT = 6;
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/**
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* Locates url, based on provided path.
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* Override to provide custom routing mechanism.
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*
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* @see Behat\MinkExtension\Context\MinkContext
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* @param string $path
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* @return string
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*/
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protected function locate_path($path) {
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$starturl = rtrim($this->getMinkParameter('base_url'), '/') . '/';
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return 0 !== strpos($path, 'http') ? $starturl . ltrim($path, '/') : $path;
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}
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/**
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* Returns the first matching element.
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*
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* @link http://mink.behat.org/#traverse-the-page-selectors
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* @param string $selector The selector type (css, xpath, named...)
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* @param mixed $locator It depends on the $selector, can be the xpath, a name, a css locator...
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* @param Exception $exception Otherwise we throw exception with generic info
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* @param NodeElement $node Spins around certain DOM node instead of the whole page
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* @return NodeElement
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*/
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protected function find($selector, $locator, $exception = false, $node = false) {
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// Returns the first match.
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$items = $this->find_all($selector, $locator, $exception, $node);
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return count($items) ? reset($items) : null;
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}
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/**
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* Returns all matching elements.
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*
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* Adapter to Behat\Mink\Element\Element::findAll() using the spin() method.
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*
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* @link http://mink.behat.org/#traverse-the-page-selectors
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* @param string $selector The selector type (css, xpath, named...)
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* @param mixed $locator It depends on the $selector, can be the xpath, a name, a css locator...
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* @param Exception $exception Otherwise we throw expcetion with generic info
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* @param NodeElement $node Spins around certain DOM node instead of the whole page
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* @return array NodeElements list
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*/
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protected function find_all($selector, $locator, $exception = false, $node = false) {
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// Generic info.
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if (!$exception) {
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// With named selectors we can be more specific.
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if ($selector == 'named') {
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$exceptiontype = $locator[0];
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$exceptionlocator = $locator[1];
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// If we are in a @javascript session all contents would be displayed as HTML characters.
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if ($this->running_javascript()) {
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$locator[1] = html_entity_decode($locator[1], ENT_NOQUOTES);
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}
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} else {
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$exceptiontype = $selector;
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$exceptionlocator = $locator;
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}
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$exception = new ElementNotFoundException($this->getSession(), $exceptiontype, null, $exceptionlocator);
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}
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$params = array('selector' => $selector, 'locator' => $locator);
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// Pushing $node if required.
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if ($node) {
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$params['node'] = $node;
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}
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// Waits for the node to appear if it exists, otherwise will timeout and throw the provided exception.
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return $this->spin(
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function($context, $args) {
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// If no DOM node provided look in all the page.
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if (empty($args['node'])) {
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return $context->getSession()->getPage()->findAll($args['selector'], $args['locator']);
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}
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// For nodes contained in other nodes we can not use the basic named selectors
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// as they include unions and they would look for matches in the DOM root.
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$elementxpath = $context->getSession()->getSelectorsHandler()->selectorToXpath($args['selector'], $args['locator']);
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// Split the xpath in unions and prefix them with the container xpath.
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$unions = explode('|', $elementxpath);
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foreach ($unions as $key => $union) {
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$union = trim($union);
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// We are in the container node.
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if (strpos($union, '.') === 0) {
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$union = substr($union, 1);
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} else if (strpos($union, '/') !== 0) {
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// Adding the path separator in case it is not there.
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$union = '/' . $union;
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}
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$unions[$key] = $args['node']->getXpath() . $union;
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}
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// We can not use usual Element::find() as it prefixes with DOM root.
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return $context->getSession()->getDriver()->find(implode('|', $unions));
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},
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$params,
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self::TIMEOUT,
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$exception
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);
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}
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/**
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* Finds DOM nodes in the page using named selectors.
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*
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* The point of using this method instead of Mink ones is the spin
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* method of behat_base::find() that looks for the element until it
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* is available or it timeouts, this avoids the false failures received
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* when selenium tries to execute commands on elements that are not
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* ready to be used.
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*
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* All steps that requires elements to be available before interact with
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* them should use one of the find* methods.
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*
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* The methods calls requires a {'find_' . $elementtype}($locator)
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* format, like find_link($locator), find_select($locator),
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* find_button($locator)...
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*
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* @link http://mink.behat.org/#named-selectors
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* @throws coding_exception
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* @param string $name The name of the called method
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* @param mixed $arguments
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* @return NodeElement
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*/
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public function __call($name, $arguments) {
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if (substr($name, 0, 5) !== 'find_') {
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throw new coding_exception('The "' . $name . '" method does not exist');
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}
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// Only the named selector identifier.
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$cleanname = substr($name, 5);
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// All named selectors shares the interface.
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if (count($arguments) !== 1) {
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throw new coding_exception('The "' . $cleanname . '" named selector needs the locator as it\'s single argument');
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}
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// Redirecting execution to the find method with the specified selector.
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// It will detect if it's pointing to an unexisting named selector.
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return $this->find('named',
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array(
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$cleanname,
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$this->getSession()->getSelectorsHandler()->xpathLiteral($arguments[0])
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)
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);
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}
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/**
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* Escapes the double quote character.
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*
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* Double quote is the argument delimiter, it can be escaped
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* with a backslash, but we auto-remove this backslashes
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* before the step execution, this method is useful when using
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* arguments as arguments for other steps.
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*
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* @param string $string
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* @return string
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*/
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public function escape($string) {
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return str_replace('"', '\"', $string);
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}
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/**
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* Executes the passed closure until returns true or time outs.
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*
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* In most cases the document.readyState === 'complete' will be enough, but sometimes JS
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* requires more time to be completely loaded or an element to be visible or whatever is required to
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* perform some action on an element; this method receives a closure which should contain the
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* required statements to ensure the step definition actions and assertions have all their needs
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* satisfied and executes it until they are satisfied or it timeouts. Redirects the return of the
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* closure to the caller.
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*
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* The closures requirements to work well with this spin method are:
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* - Must return false, null or '' if something goes wrong
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* - Must return something != false if finishes as expected, this will be the (mixed) value
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* returned by spin()
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*
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* The arguments of the closure are mixed, use $args depending on your needs.
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*
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* You can provide an exception to give more accurate feedback to tests writers, otherwise the
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* closure exception will be used, but you must provide an exception if the closure does not throws
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* an exception.
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*
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* @throws Exception If it timeouts without receiving something != false from the closure
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* @param Closure $lambda The function to execute.
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* @param mixed $args Arguments to pass to the closure
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* @param int $timeout Timeout
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* @param Exception $exception The exception to throw in case it time outs.
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* @return mixed The value returned by the closure
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*/
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protected function spin($lambda, $args = false, $timeout = false, $exception = false) {
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// Using default timeout which is pretty high.
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if (!$timeout) {
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$timeout = self::TIMEOUT;
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}
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for ($i = 0; $i < $timeout; $i++) {
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// We catch the exception thrown by the step definition to execute it again.
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try {
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// We don't check with !== because most of the time closures will return
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// direct Behat methods returns and we are not sure it will be always (bool)false
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// if it just runs the behat method without returning anything $return == null.
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if ($return = $lambda($this, $args)) {
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return $return;
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}
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} catch (Exception $e) {
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// We would use the first closure exception if no exception has been provided.
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if (!$exception) {
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$exception = $e;
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}
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// We wait until no exception is thrown or timeout expires.
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continue;
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}
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sleep(1);
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}
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// Using coding_exception as is a development issue if no exception has been provided.
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if (!$exception) {
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$exception = new coding_exception('spin method requires an exception if the closure doesn\'t throw an exception itself');
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}
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// Throwing exception to the user.
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throw $exception;
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}
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/**
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* Gets a NodeElement based on the locator and selector type received as argument from steps definitions.
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*
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* Use behat_base::get_text_selector_node() for text-based selectors.
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*
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* @throws ElementNotFoundException Thrown by behat_base::find
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* @param string $selectortype
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* @param string $element
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* @return NodeElement
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*/
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protected function get_selected_node($selectortype, $element) {
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// Getting Mink selector and locator.
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list($selector, $locator) = $this->transform_selector($selectortype, $element);
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// Returns the NodeElement.
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return $this->find($selector, $locator);
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}
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/**
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* Gets a NodeElement based on the locator and selector type received as argument from steps definitions.
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*
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* @throws ElementNotFoundException Thrown by behat_base::find
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* @param string $selectortype
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* @param string $element
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* @return NodeElement
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*/
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protected function get_text_selector_node($selectortype, $element) {
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// Getting Mink selector and locator.
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list($selector, $locator) = $this->transform_text_selector($selectortype, $element);
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// Returns the NodeElement.
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return $this->find($selector, $locator);
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}
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/**
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* Gets the requested element inside the specified container.
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*
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* @throws ElementNotFoundException Thrown by behat_base::find
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* @param mixed $selectortype The element selector type.
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* @param mixed $element The element locator.
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* @param mixed $containerselectortype The container selector type.
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* @param mixed $containerelement The container locator.
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* @return NodeElement
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*/
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protected function get_node_in_container($selectortype, $element, $containerselectortype, $containerelement) {
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// Gets the container, it will always be text based.
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$containernode = $this->get_text_selector_node($containerselectortype, $containerelement);
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list($selector, $locator) = $this->transform_selector($selectortype, $element);
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// Specific exception giving info about where can't we find the element.
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$locatorexceptionmsg = $element . '" in the "' . $containerelement. '" "' . $containerselectortype. '"';
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$exception = new ElementNotFoundException($this->getSession(), $selectortype, null, $locatorexceptionmsg);
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// Looks for the requested node inside the container node.
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return $this->find($selector, $locator, $exception, $containernode);
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}
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/**
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* Transforms from step definition's argument style to Mink format.
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*
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* Mink has 3 different selectors css, xpath and named, where named
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* selectors includes link, button, field... to simplify and group multiple
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* steps in one we use the same interface, considering all link, buttons...
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* at the same level as css selectors and xpath; this method makes the
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* conversion from the arguments received by the steps to the selectors and locators
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* required to interact with Mink.
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*
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* @throws ExpectationException
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* @param string $selectortype It can be css, xpath or any of the named selectors.
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* @param string $element The locator (or string) we are looking for.
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* @return array Contains the selector and the locator expected by Mink.
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*/
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protected function transform_selector($selectortype, $element) {
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// Here we don't know if a $allowedtextselector is used.
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if (!isset(behat_command::$allowedselectors[$selectortype])) {
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throw new ExpectationException('The "' . $selectortype . '" selector type does not exist', $this->getSession());
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}
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// CSS and XPath selectors locator is one single argument.
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if ($selectortype == 'css_element' || $selectortype == 'xpath_element') {
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$selector = str_replace('_element', '', $selectortype);
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$locator = $element;
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} else {
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// Named selectors uses arrays as locators including the type of named selector.
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$locator = array($selectortype, $this->getSession()->getSelectorsHandler()->xpathLiteral($element));
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$selector = 'named';
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}
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return array($selector, $locator);
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}
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/**
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* Transforms from step definition's argument style to Mink format.
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*
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* Delegates all the process to behat_base::transform_selector() checking
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* the provided $selectortype.
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*
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* @throws ExpectationException
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* @param string $selectortype It can be css, xpath or any of the named selectors.
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* @param string $element The locator (or string) we are looking for.
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* @return array Contains the selector and the locator expected by Mink.
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*/
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protected function transform_text_selector($selectortype, $element) {
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if ($selectortype != 'css_element' && $selectortype != 'xpath_element') {
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throw new ExpectationException('The "' . $selectortype . '" selector can not be used to select text nodes', $this->getSession());
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}
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return $this->transform_selector($selectortype, $element);
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}
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/**
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* Returns whether the scenario is running in a browser that can run Javascript or not.
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*
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* @return boolean
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*/
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protected function running_javascript() {
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return get_class($this->getSession()->getDriver()) !== 'Behat\Mink\Driver\GoutteDriver';
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}
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}
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