MDL-46891 behat: Optimised login step and context helper
[moodle.git] / lib / behat / behat_base.php
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1<?php
2// This file is part of Moodle - http://moodle.org/
3//
4// Moodle is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// Moodle is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
16
17/**
18 * Base class of all steps definitions.
19 *
20 * This script is only called from Behat as part of it's integration
21 * in Moodle.
22 *
23 * @package core
24 * @category test
25 * @copyright 2012 David MonllaĆ³
26 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
27 */
28
29// NOTE: no MOODLE_INTERNAL test here, this file may be required by behat before including /config.php.
30
ff48a235 31use Behat\Mink\Exception\ExpectationException as ExpectationException,
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32 Behat\Mink\Exception\ElementNotFoundException as ElementNotFoundException,
33 Behat\Mink\Element\NodeElement as NodeElement;
ff48a235 34
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35/**
36 * Steps definitions base class.
37 *
38 * To extend by the steps definitions of the different Moodle components.
39 *
40 * It can not contain steps definitions to avoid duplicates, only utility
41 * methods shared between steps.
42 *
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43 * @method NodeElement find_field(string $locator) Finds a form element
44 * @method NodeElement find_button(string $locator) Finds a form input submit element or a button
45 * @method NodeElement find_link(string $locator) Finds a link on a page
46 * @method NodeElement find_file(string $locator) Finds a forum input file element
47 *
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48 * @package core
49 * @category test
50 * @copyright 2012 David MonllaĆ³
51 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
52 */
53class behat_base extends Behat\MinkExtension\Context\RawMinkContext {
54
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55 /**
56 * Small timeout.
57 *
58 * A reduced timeout for cases where self::TIMEOUT is too much
59 * and a simple $this->getSession()->getPage()->find() could not
60 * be enough.
61 */
62 const REDUCED_TIMEOUT = 2;
63
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64 /**
65 * The timeout for each Behat step (load page, wait for an element to load...).
66 */
845ceaff 67 const TIMEOUT = 6;
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68
69 /**
70 * And extended timeout for specific cases.
71 */
72 const EXTENDED_TIMEOUT = 10;
73
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74 /**
75 * The JS code to check that the page is ready.
76 */
41f4dabe 77 const PAGE_READY_JS = '(typeof M !== "undefined" && M.util && M.util.pending_js && !Boolean(M.util.pending_js.length)) && (document.readyState === "complete")';
d4322e38 78
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79 /**
80 * Locates url, based on provided path.
81 * Override to provide custom routing mechanism.
82 *
83 * @see Behat\MinkExtension\Context\MinkContext
84 * @param string $path
85 * @return string
86 */
40923977 87 protected function locate_path($path) {
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88 $starturl = rtrim($this->getMinkParameter('base_url'), '/') . '/';
89 return 0 !== strpos($path, 'http') ? $starturl . ltrim($path, '/') : $path;
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90 }
91
ff48a235 92 /**
f8f1bdc3 93 * Returns the first matching element.
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94 *
95 * @link http://mink.behat.org/#traverse-the-page-selectors
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96 * @param string $selector The selector type (css, xpath, named...)
97 * @param mixed $locator It depends on the $selector, can be the xpath, a name, a css locator...
40923977 98 * @param Exception $exception Otherwise we throw exception with generic info
072f67fc 99 * @param NodeElement $node Spins around certain DOM node instead of the whole page
74c78e74 100 * @param int $timeout Forces a specific time out (in seconds).
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101 * @return NodeElement
102 */
74c78e74 103 protected function find($selector, $locator, $exception = false, $node = false, $timeout = false) {
ff48a235 104
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105 // Throw exception, so dev knows it is not supported.
106 if ($selector === 'named') {
107 $exception = 'Using the "named" selector is deprecated as of 3.1. '
108 .' Use the "named_partial" or use the "named_exact" selector instead.';
109 throw new ExpectationException($exception, $this->getSession());
110 }
111
f8f1bdc3 112 // Returns the first match.
74c78e74 113 $items = $this->find_all($selector, $locator, $exception, $node, $timeout);
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114 return count($items) ? reset($items) : null;
115 }
116
117 /**
118 * Returns all matching elements.
119 *
120 * Adapter to Behat\Mink\Element\Element::findAll() using the spin() method.
121 *
122 * @link http://mink.behat.org/#traverse-the-page-selectors
123 * @param string $selector The selector type (css, xpath, named...)
124 * @param mixed $locator It depends on the $selector, can be the xpath, a name, a css locator...
125 * @param Exception $exception Otherwise we throw expcetion with generic info
126 * @param NodeElement $node Spins around certain DOM node instead of the whole page
74c78e74 127 * @param int $timeout Forces a specific time out (in seconds). If 0 is provided the default timeout will be applied.
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128 * @return array NodeElements list
129 */
74c78e74 130 protected function find_all($selector, $locator, $exception = false, $node = false, $timeout = false) {
f8f1bdc3 131
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132 // Throw exception, so dev knows it is not supported.
133 if ($selector === 'named') {
134 $exception = 'Using the "named" selector is deprecated as of 3.1. '
135 .' Use the "named_partial" or use the "named_exact" selector instead.';
136 throw new ExpectationException($exception, $this->getSession());
137 }
138
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139 // Generic info.
140 if (!$exception) {
141
142 // With named selectors we can be more specific.
42ad096f 143 if (($selector == 'named_exact') || ($selector == 'named_partial')){
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144 $exceptiontype = $locator[0];
145 $exceptionlocator = $locator[1];
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146
147 // If we are in a @javascript session all contents would be displayed as HTML characters.
eff79d53 148 if ($this->running_javascript()) {
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149 $locator[1] = html_entity_decode($locator[1], ENT_NOQUOTES);
150 }
151
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152 } else {
153 $exceptiontype = $selector;
154 $exceptionlocator = $locator;
155 }
156
157 $exception = new ElementNotFoundException($this->getSession(), $exceptiontype, null, $exceptionlocator);
158 }
159
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160 $params = array('selector' => $selector, 'locator' => $locator);
161 // Pushing $node if required.
162 if ($node) {
163 $params['node'] = $node;
164 }
165
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166 // How much we will be waiting for the element to appear.
167 if (!$timeout) {
168 $timeout = self::TIMEOUT;
169 $microsleep = false;
170 } else {
171 // Spinning each 0.1 seconds if the timeout was forced as we understand
172 // that is a special case and is good to refine the performance as much
173 // as possible.
174 $microsleep = true;
175 }
176
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177 // Waits for the node to appear if it exists, otherwise will timeout and throw the provided exception.
178 return $this->spin(
179 function($context, $args) {
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180
181 // If no DOM node provided look in all the page.
182 if (empty($args['node'])) {
f8f1bdc3 183 return $context->getSession()->getPage()->findAll($args['selector'], $args['locator']);
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184 }
185
186 // For nodes contained in other nodes we can not use the basic named selectors
187 // as they include unions and they would look for matches in the DOM root.
188 $elementxpath = $context->getSession()->getSelectorsHandler()->selectorToXpath($args['selector'], $args['locator']);
189
190 // Split the xpath in unions and prefix them with the container xpath.
191 $unions = explode('|', $elementxpath);
192 foreach ($unions as $key => $union) {
193 $union = trim($union);
194
195 // We are in the container node.
196 if (strpos($union, '.') === 0) {
197 $union = substr($union, 1);
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198 } else if (strpos($union, '/') !== 0) {
199 // Adding the path separator in case it is not there.
200 $union = '/' . $union;
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201 }
202 $unions[$key] = $args['node']->getXpath() . $union;
203 }
204
205 // We can not use usual Element::find() as it prefixes with DOM root.
f8f1bdc3 206 return $context->getSession()->getDriver()->find(implode('|', $unions));
ff48a235 207 },
072f67fc 208 $params,
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209 $timeout,
210 $exception,
211 $microsleep
46ac40cd 212 );
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213 }
214
215 /**
216 * Finds DOM nodes in the page using named selectors.
217 *
218 * The point of using this method instead of Mink ones is the spin
219 * method of behat_base::find() that looks for the element until it
220 * is available or it timeouts, this avoids the false failures received
221 * when selenium tries to execute commands on elements that are not
222 * ready to be used.
223 *
224 * All steps that requires elements to be available before interact with
225 * them should use one of the find* methods.
226 *
227 * The methods calls requires a {'find_' . $elementtype}($locator)
228 * format, like find_link($locator), find_select($locator),
229 * find_button($locator)...
230 *
231 * @link http://mink.behat.org/#named-selectors
232 * @throws coding_exception
46ac40cd 233 * @param string $name The name of the called method
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234 * @param mixed $arguments
235 * @return NodeElement
236 */
237 public function __call($name, $arguments) {
238
239 if (substr($name, 0, 5) !== 'find_') {
240 throw new coding_exception('The "' . $name . '" method does not exist');
241 }
242
243 // Only the named selector identifier.
244 $cleanname = substr($name, 5);
245
246 // All named selectors shares the interface.
247 if (count($arguments) !== 1) {
248 throw new coding_exception('The "' . $cleanname . '" named selector needs the locator as it\'s single argument');
249 }
250
251 // Redirecting execution to the find method with the specified selector.
252 // It will detect if it's pointing to an unexisting named selector.
42ad096f 253 return $this->find('named_partial',
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254 array(
255 $cleanname,
256 $this->getSession()->getSelectorsHandler()->xpathLiteral($arguments[0])
257 )
258 );
259 }
260
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261 /**
262 * Escapes the double quote character.
263 *
264 * Double quote is the argument delimiter, it can be escaped
265 * with a backslash, but we auto-remove this backslashes
266 * before the step execution, this method is useful when using
267 * arguments as arguments for other steps.
268 *
269 * @param string $string
270 * @return string
271 */
272 public function escape($string) {
273 return str_replace('"', '\"', $string);
274 }
275
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276 /**
277 * Executes the passed closure until returns true or time outs.
278 *
279 * In most cases the document.readyState === 'complete' will be enough, but sometimes JS
280 * requires more time to be completely loaded or an element to be visible or whatever is required to
281 * perform some action on an element; this method receives a closure which should contain the
282 * required statements to ensure the step definition actions and assertions have all their needs
283 * satisfied and executes it until they are satisfied or it timeouts. Redirects the return of the
284 * closure to the caller.
285 *
286 * The closures requirements to work well with this spin method are:
287 * - Must return false, null or '' if something goes wrong
288 * - Must return something != false if finishes as expected, this will be the (mixed) value
289 * returned by spin()
290 *
ff48a235 291 * The arguments of the closure are mixed, use $args depending on your needs.
786ea937 292 *
ff48a235 293 * You can provide an exception to give more accurate feedback to tests writers, otherwise the
c51c3b55 294 * closure exception will be used, but you must provide an exception if the closure does not throw
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295 * an exception.
296 *
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297 * @throws Exception If it timeouts without receiving something != false from the closure
298 * @param Function|array|string $lambda The function to execute or an array passed to call_user_func (maps to a class method)
299 * @param mixed $args Arguments to pass to the closure
300 * @param int $timeout Timeout in seconds
301 * @param Exception $exception The exception to throw in case it time outs.
302 * @param bool $microsleep If set to true it'll sleep micro seconds rather than seconds.
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303 * @return mixed The value returned by the closure
304 */
8e5f86bc 305 protected function spin($lambda, $args = false, $timeout = false, $exception = false, $microsleep = false) {
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306
307 // Using default timeout which is pretty high.
308 if (!$timeout) {
309 $timeout = self::TIMEOUT;
310 }
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311 if ($microsleep) {
312 // Will sleep 1/10th of a second by default for self::TIMEOUT seconds.
313 $loops = $timeout * 10;
314 } else {
315 // Will sleep for self::TIMEOUT seconds.
316 $loops = $timeout;
317 }
786ea937 318
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319 // DOM will never change on non-javascript case; do not wait or try again.
320 if (!$this->running_javascript()) {
321 $loops = 1;
322 }
323
8e5f86bc 324 for ($i = 0; $i < $loops; $i++) {
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325 // We catch the exception thrown by the step definition to execute it again.
326 try {
786ea937 327 // We don't check with !== because most of the time closures will return
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328 // direct Behat methods returns and we are not sure it will be always (bool)false
329 // if it just runs the behat method without returning anything $return == null.
8e5f86bc 330 if ($return = call_user_func($lambda, $this, $args)) {
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331 return $return;
332 }
46ac40cd 333 } catch (Exception $e) {
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334 // We would use the first closure exception if no exception has been provided.
335 if (!$exception) {
336 $exception = $e;
337 }
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338 // We wait until no exception is thrown or timeout expires.
339 continue;
340 }
341
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342 if ($this->running_javascript()) {
343 if ($microsleep) {
344 usleep(100000);
345 } else {
346 sleep(1);
347 }
8e5f86bc 348 }
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349 }
350
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351 // Using coding_exception as is a development issue if no exception has been provided.
352 if (!$exception) {
8e5f86bc 353 $exception = new coding_exception('spin method requires an exception if the callback does not throw an exception');
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354 }
355
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356 // Throwing exception to the user.
357 throw $exception;
358 }
359
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360 /**
361 * Gets a NodeElement based on the locator and selector type received as argument from steps definitions.
362 *
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363 * Use behat_base::get_text_selector_node() for text-based selectors.
364 *
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365 * @throws ElementNotFoundException Thrown by behat_base::find
366 * @param string $selectortype
367 * @param string $element
368 * @return NodeElement
369 */
370 protected function get_selected_node($selectortype, $element) {
371
372 // Getting Mink selector and locator.
373 list($selector, $locator) = $this->transform_selector($selectortype, $element);
374
375 // Returns the NodeElement.
376 return $this->find($selector, $locator);
377 }
378
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379 /**
380 * Gets a NodeElement based on the locator and selector type received as argument from steps definitions.
381 *
382 * @throws ElementNotFoundException Thrown by behat_base::find
383 * @param string $selectortype
384 * @param string $element
385 * @return NodeElement
386 */
387 protected function get_text_selector_node($selectortype, $element) {
388
389 // Getting Mink selector and locator.
390 list($selector, $locator) = $this->transform_text_selector($selectortype, $element);
391
392 // Returns the NodeElement.
393 return $this->find($selector, $locator);
394 }
395
396 /**
397 * Gets the requested element inside the specified container.
398 *
399 * @throws ElementNotFoundException Thrown by behat_base::find
400 * @param mixed $selectortype The element selector type.
401 * @param mixed $element The element locator.
402 * @param mixed $containerselectortype The container selector type.
403 * @param mixed $containerelement The container locator.
404 * @return NodeElement
405 */
406 protected function get_node_in_container($selectortype, $element, $containerselectortype, $containerelement) {
407
408 // Gets the container, it will always be text based.
409 $containernode = $this->get_text_selector_node($containerselectortype, $containerelement);
410
411 list($selector, $locator) = $this->transform_selector($selectortype, $element);
412
413 // Specific exception giving info about where can't we find the element.
414 $locatorexceptionmsg = $element . '" in the "' . $containerelement. '" "' . $containerselectortype. '"';
415 $exception = new ElementNotFoundException($this->getSession(), $selectortype, null, $locatorexceptionmsg);
416
417 // Looks for the requested node inside the container node.
418 return $this->find($selector, $locator, $exception, $containernode);
419 }
420
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421 /**
422 * Transforms from step definition's argument style to Mink format.
423 *
424 * Mink has 3 different selectors css, xpath and named, where named
425 * selectors includes link, button, field... to simplify and group multiple
426 * steps in one we use the same interface, considering all link, buttons...
427 * at the same level as css selectors and xpath; this method makes the
428 * conversion from the arguments received by the steps to the selectors and locators
429 * required to interact with Mink.
430 *
431 * @throws ExpectationException
432 * @param string $selectortype It can be css, xpath or any of the named selectors.
433 * @param string $element The locator (or string) we are looking for.
434 * @return array Contains the selector and the locator expected by Mink.
435 */
436 protected function transform_selector($selectortype, $element) {
437
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438 // Here we don't know if an allowed text selector is being used.
439 $selectors = behat_selectors::get_allowed_selectors();
440 if (!isset($selectors[$selectortype])) {
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441 throw new ExpectationException('The "' . $selectortype . '" selector type does not exist', $this->getSession());
442 }
443
17344d4c 444 return behat_selectors::get_behat_selector($selectortype, $element, $this->getSession());
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445 }
446
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447 /**
448 * Transforms from step definition's argument style to Mink format.
449 *
450 * Delegates all the process to behat_base::transform_selector() checking
451 * the provided $selectortype.
452 *
453 * @throws ExpectationException
454 * @param string $selectortype It can be css, xpath or any of the named selectors.
455 * @param string $element The locator (or string) we are looking for.
456 * @return array Contains the selector and the locator expected by Mink.
457 */
458 protected function transform_text_selector($selectortype, $element) {
459
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460 $selectors = behat_selectors::get_allowed_text_selectors();
461 if (empty($selectors[$selectortype])) {
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462 throw new ExpectationException('The "' . $selectortype . '" selector can not be used to select text nodes', $this->getSession());
463 }
464
465 return $this->transform_selector($selectortype, $element);
466 }
467
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468 /**
469 * Returns whether the scenario is running in a browser that can run Javascript or not.
470 *
471 * @return boolean
472 */
473 protected function running_javascript() {
28abad1a 474 return get_class($this->getSession()->getDriver()) !== 'Behat\Mink\Driver\GoutteDriver';
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475 }
476
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477 /**
478 * Spins around an element until it exists
479 *
480 * @throws ExpectationException
481 * @param string $element
482 * @param string $selectortype
483 * @return void
484 */
485 protected function ensure_element_exists($element, $selectortype) {
486
487 // Getting the behat selector & locator.
488 list($selector, $locator) = $this->transform_selector($selectortype, $element);
489
490 // Exception if it timesout and the element is still there.
c1faf86b 491 $msg = 'The "' . $element . '" element does not exist and should exist';
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492 $exception = new ExpectationException($msg, $this->getSession());
493
c1faf86b 494 // It will stop spinning once the find() method returns true.
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495 $this->spin(
496 function($context, $args) {
497 // We don't use behat_base::find as it is already spinning.
498 if ($context->getSession()->getPage()->find($args['selector'], $args['locator'])) {
499 return true;
500 }
c1faf86b 501 return false;
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502 },
503 array('selector' => $selector, 'locator' => $locator),
504 self::EXTENDED_TIMEOUT,
505 $exception,
506 true
507 );
508
509 }
510
511 /**
512 * Spins until the element does not exist
513 *
514 * @throws ExpectationException
515 * @param string $element
516 * @param string $selectortype
517 * @return void
518 */
519 protected function ensure_element_does_not_exist($element, $selectortype) {
520
521 // Getting the behat selector & locator.
522 list($selector, $locator) = $this->transform_selector($selectortype, $element);
523
524 // Exception if it timesout and the element is still there.
c1faf86b 525 $msg = 'The "' . $element . '" element exists and should not exist';
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526 $exception = new ExpectationException($msg, $this->getSession());
527
c1faf86b 528 // It will stop spinning once the find() method returns false.
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529 $this->spin(
530 function($context, $args) {
c1faf86b 531 // We don't use behat_base::find() as we are already spinning.
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532 if (!$context->getSession()->getPage()->find($args['selector'], $args['locator'])) {
533 return true;
534 }
c1faf86b 535 return false;
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536 },
537 array('selector' => $selector, 'locator' => $locator),
538 self::EXTENDED_TIMEOUT,
539 $exception,
540 true
541 );
542 }
543
544 /**
545 * Ensures that the provided node is visible and we can interact with it.
546 *
547 * @throws ExpectationException
548 * @param NodeElement $node
549 * @return void Throws an exception if it times out without the element being visible
550 */
551 protected function ensure_node_is_visible($node) {
552
553 if (!$this->running_javascript()) {
554 return;
555 }
556
557 // Exception if it timesout and the element is still there.
c1faf86b 558 $msg = 'The "' . $node->getXPath() . '" xpath node is not visible and it should be visible';
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559 $exception = new ExpectationException($msg, $this->getSession());
560
c1faf86b 561 // It will stop spinning once the isVisible() method returns true.
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562 $this->spin(
563 function($context, $args) {
564 if ($args->isVisible()) {
565 return true;
566 }
c1faf86b 567 return false;
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568 },
569 $node,
570 self::EXTENDED_TIMEOUT,
571 $exception,
572 true
573 );
574 }
575
576 /**
577 * Ensures that the provided element is visible and we can interact with it.
578 *
579 * Returns the node in case other actions are interested in using it.
580 *
581 * @throws ExpectationException
582 * @param string $element
583 * @param string $selectortype
584 * @return NodeElement Throws an exception if it times out without being visible
585 */
586 protected function ensure_element_is_visible($element, $selectortype) {
587
588 if (!$this->running_javascript()) {
589 return;
590 }
591
592 $node = $this->get_selected_node($selectortype, $element);
593 $this->ensure_node_is_visible($node);
594
595 return $node;
596 }
597
598 /**
599 * Ensures that all the page's editors are loaded.
600 *
9f07f05a 601 * @deprecated since Moodle 2.7 MDL-44084 - please do not use this function any more.
d1e55a47 602 * @throws ElementNotFoundException
c1faf86b 603 * @throws ExpectationException
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604 * @return void
605 */
606 protected function ensure_editors_are_loaded() {
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607 global $CFG;
608
609 if (empty($CFG->behat_usedeprecated)) {
610 debugging('Function behat_base::ensure_editors_are_loaded() is deprecated. It is no longer required.');
611 }
9f07f05a 612 return;
d1e55a47 613 }
c1faf86b 614
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615 /**
616 * Change browser window size.
617 * - small: 640x480
618 * - medium: 1024x768
619 * - large: 2560x1600
620 *
621 * @param string $windowsize size of window.
622 * @throws ExpectationException
623 */
624 protected function resize_window($windowsize) {
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625 // Non JS don't support resize window.
626 if (!$this->running_javascript()) {
627 return;
628 }
629
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630 switch ($windowsize) {
631 case "small":
632 $width = 640;
633 $height = 480;
634 break;
635 case "medium":
636 $width = 1024;
637 $height = 768;
638 break;
639 case "large":
640 $width = 2560;
641 $height = 1600;
642 break;
643 default:
3233f32d 644 preg_match('/^(\d+x\d+)$/', $windowsize, $matches);
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645 if (empty($matches) || (count($matches) != 2)) {
646 throw new ExpectationException("Invalid screen size, can't resize", $this->getSession());
647 }
648 $size = explode('x', $windowsize);
649 $width = (int) $size[0];
650 $height = (int) $size[1];
651 }
652 $this->getSession()->getDriver()->resizeWindow($width, $height);
653 }
d4322e38 654}