[MDL-59845] Behat Stale Element reference failures - Moodle Tracker

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Type: Bug
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: 3.4
Fix Version/s: 3.3.6, 3.4.3
Component/s: Automated functional tests (behat)
Labels:
- ci
- triaged

Affected Branches:
MOODLE_34_STABLE
Fixed Branches:
MOODLE_33_STABLE, MOODLE_34_STABLE
Pull from Repository:
git://github.com/andrewnicols/moodle.git
Pull Master Branch:
~~MDL-59845~~-master
Pull Master Diff URL:
https://github.com/andrewnicols/moodle/compare/446d8483a3...MDL-59845-master
Testing Instructions:
1. Behat covers this

Description

001 Scenario: Manager reopen a complete learning plan # /var/www/html/moodle/admin/tool/lp/tests/behat/plan_workflow.feature:183

      And I follow "Test-Plan4"                       # /var/www/html/moodle/admin/tool/lp/tests/behat/plan_workflow.feature:196

        WebDriver\Exception\StaleElementReference: Element is no longer attached to the DOM

        For documentation on this error, please visit: http://seleniumhq.org/exceptions/stale_element_reference.html

        Build info: version: '2.53.1', revision: 'a36b8b1', time: '2016-06-30 17:37:03'

        System info: host: 'e2718cfcc7c3', ip: '172.18.0.8', os.name: 'Linux', os.arch: 'amd64', os.version: '4.4.0-87-generic', java.version: '1.7.0_121'

        Driver info: driver.version: unknown in /var/www/html/moodle/vendor/instaclick/php-webdriver/lib/WebDriver/Exception.php:155

        Stack trace:

        #0 /var/www/html/moodle/vendor/instaclick/php-webdriver/lib/WebDriver/AbstractWebDriver.php(140): WebDriver\Exception::factory(10, 'Element is no l...')

        #1 /var/www/html/moodle/vendor/instaclick/php-webdriver/lib/WebDriver/AbstractWebDriver.php(198): WebDriver\AbstractWebDriver->curl('POST', '/click', NULL)

        #2 /var/www/html/moodle/vendor/instaclick/php-webdriver/lib/WebDriver/Container.php(218): WebDriver\AbstractWebDriver->__call('click', Array)

        #3 /var/www/html/moodle/vendor/behat/mink-selenium2-driver/src/Selenium2Driver.php(748): WebDriver\Container->__call('click', Array)

        #4 /var/www/html/moodle/vendor/behat/mink-selenium2-driver/src/Selenium2Driver.php(742): Behat\Mink\Driver\Selenium2Driver->clickOnElement(Object(WebDriver\Element))

        #5 /var/www/html/moodle/vendor/behat/mink/src/Element/NodeElement.php(153): Behat\Mink\Driver\Selenium2Driver->click('(//html/.//a\n[....')

        #6 /var/www/html/moodle/lib/tests/behat/behat_general.php(245): Behat\Mink\Element\NodeElement->click()

        #7 [internal function]: behat_general->click_link('Test-Plan4')

        #8 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php(103): call_user_func_array(Array, Array)

        #9 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php(59): Behat\Testwork\Call\Handler\RuntimeCallHandler->executeCall(Object(Behat\Behat\Definition\Call\DefinitionCall))

        #10 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Call/CallCenter.php(140): Behat\Testwork\Call\Handler\RuntimeCallHandler->handleCall(Object(Behat\Behat\Definition\Call\DefinitionCall))

        #11 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Call/CallCenter.php(96): Behat\Testwork\Call\CallCenter->handleCall(Object(Behat\Behat\Definition\Call\DefinitionCall))

        #12 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/Runtime/RuntimeStepTester.php(125): Behat\Testwork\Call\CallCenter->makeCall(Object(Behat\Behat\Definition\Call\DefinitionCall))

        #13 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/Runtime/RuntimeStepTester.php(73): Behat\Behat\Tester\Runtime\RuntimeStepTester->testDefinition(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), Object(Behat\Behat\Definition\SearchResult), false)

        #14 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Hook/Tester/HookableStepTester.php(74): Behat\Behat\Tester\Runtime\RuntimeStepTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), false)

        #15 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/EventDispatcher/Tester/TickingStepTester.php(59): Behat\Behat\Hook\Tester\HookableStepTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), false)

        #16 /var/www/html/moodle/vendor/moodlehq/behat-extension/src/Moodle/BehatExtension/EventDispatcher/Tester/ChainedStepTester.php(103): Behat\Behat\EventDispatcher\Tester\TickingStepTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), false)

        #17 /var/www/html/moodle/vendor/moodlehq/behat-extension/src/Moodle/BehatExtension/EventDispatcher/Tester/MoodleEventDispatchingStepTester.php(88): Moodle\BehatExtension\EventDispatcher\Tester\ChainedStepTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), false)

        #18 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/StepContainerTester.php(59): Moodle\BehatExtension\EventDispatcher\Tester\MoodleEventDispatchingStepTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\StepNode), false)

        #19 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/Runtime/RuntimeScenarioTester.php(76): Behat\Behat\Tester\StepContainerTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\ScenarioNode), false)

        #20 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Hook/Tester/HookableScenarioTester.php(74): Behat\Behat\Tester\Runtime\RuntimeScenarioTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\ScenarioNode), false)

        #21 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/EventDispatcher/Tester/EventDispatchingScenarioTester.php(103): Behat\Behat\Hook\Tester\HookableScenarioTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\ScenarioNode), false)

        #22 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/Runtime/IsolatingScenarioTester.php(69): Behat\Behat\EventDispatcher\Tester\EventDispatchingScenarioTester->test(Object(Behat\Behat\Context\Environment\InitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\ScenarioNode), false)

        #23 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Tester/Runtime/RuntimeFeatureTester.php(84): Behat\Behat\Tester\Runtime\IsolatingScenarioTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), Object(Behat\Gherkin\Node\ScenarioNode), false)

        #24 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/Hook/Tester/HookableFeatureTester.php(72): Behat\Behat\Tester\Runtime\RuntimeFeatureTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), false)

        #25 /var/www/html/moodle/vendor/behat/behat/src/Behat/Behat/EventDispatcher/Tester/EventDispatchingFeatureTester.php(71): Behat\Behat\Hook\Tester\HookableFeatureTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), false)

        #26 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Tester/Runtime/RuntimeSuiteTester.php(63): Behat\Behat\EventDispatcher\Tester\EventDispatchingFeatureTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Gherkin\Node\FeatureNode), false)

        #27 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Hook/Tester/HookableSuiteTester.php(73): Behat\Testwork\Tester\Runtime\RuntimeSuiteTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Testwork\Specification\GroupedSpecificationIterator), false)

        #28 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/EventDispatcher/Tester/EventDispatchingSuiteTester.php(72): Behat\Testwork\Hook\Tester\HookableSuiteTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Testwork\Specification\GroupedSpecificationIterator), false)

        #29 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Tester/Runtime/RuntimeExercise.php(71): Behat\Testwork\EventDispatcher\Tester\EventDispatchingSuiteTester->test(Object(Behat\Behat\Context\Environment\UninitializedContextEnvironment), Object(Behat\Testwork\Specification\GroupedSpecificationIterator), false)

        #30 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/EventDispatcher/Tester/EventDispatchingExercise.php(70): Behat\Testwork\Tester\Runtime\RuntimeExercise->test(Array, false)

        #31 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Ordering/OrderedExercise.php(80): Behat\Testwork\EventDispatcher\Tester\EventDispatchingExercise->test(Array, false)

        #32 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Tester/Cli/ExerciseController.php(149): Behat\Testwork\Ordering\OrderedExercise->test(Array, false)

        #33 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Tester/Cli/ExerciseController.php(108): Behat\Testwork\Tester\Cli\ExerciseController->testSpecifications(Object(Symfony\Component\Console\Input\ArgvInput), Array)

        #34 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Cli/Command.php(63): Behat\Testwork\Tester\Cli\ExerciseController->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #35 /var/www/html/moodle/vendor/symfony/console/Command/Command.php(262): Behat\Testwork\Cli\Command->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #36 /var/www/html/moodle/vendor/symfony/console/Application.php(826): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #37 /var/www/html/moodle/vendor/symfony/console/Application.php(189): Symfony\Component\Console\Application->doRunCommand(Object(Behat\Testwork\Cli\Command), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #38 /var/www/html/moodle/vendor/behat/behat/src/Behat/Testwork/Cli/Application.php(124): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #39 /var/www/html/moodle/vendor/symfony/console/Application.php(120): Behat\Testwork\Cli\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))

        #40 /var/www/html/moodle/vendor/behat/behat/bin/behat(34): Symfony\Component\Console\Application->run()

        #41 {main}

The general consensus from Doctor Google is that this happens with poorly written tests.
In our case, I believe it happens because we find an element, then we wait for a period, and then we click on it. During this time, the DOM may change and the element is now stale.

https://stackoverflow.com/questions/5709204/random-element-is-no-longer-attached-to-the-dom-staleelementreferenceexception
https://stackoverflow.com/questions/17174515/how-to-resolve-stale-element-exception-if-element-is-no-longer-attached-to-the

The general advise seems to be to change the way in which we click on things so that we wait until it's visible before we find and click upon it, but I'm not sure if this is possible with our use of Selenium.

Opening this issue so we have somewhere to keep track of failures.

Attachments

Issue Links

has been marked as being related by

MDL-60773 autocomplete regularly fails with stale elements

Closed

links to

Project M33.02 Pull, Setup and run all behat features in firefox-linux - Parallel # 60

Activity

People

Assignee:: Andrew Lyons

Reporter:: Andrew Lyons

Peer reviewer:: Eloy Lafuente (stronk7)

Integrator:: Jake Dallimore

Tester:: CiBoT

Participants:: Andrew Lyons, CiBoT, David Monllaó, Eloy Lafuente (stronk7), Jake Dallimore

Component watchers:

Votes:: 0 Vote for this issue

Watchers:: 2 Start watching this issue

Dates

Created:: 17/Aug/17 6:16 PM

Updated:: 09/May/18 6:35 AM

Resolved:: 09/May/18 6:35 AM

Fix Release Date:: 17/May/18