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<?php namespace Chekote\BehatRetryExtension\Tester; |
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use Behat\Behat\Definition\Call\DefinitionCall; |
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use Behat\Behat\Definition\DefinitionFinder; |
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use Behat\Behat\Definition\Exception\SearchException; |
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use Behat\Behat\Definition\SearchResult; |
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use Behat\Behat\Tester\Exception\PendingException; |
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use Behat\Behat\Tester\Result\ExecutedStepResult; |
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use Behat\Behat\Tester\Result\FailedStepSearchResult; |
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use Behat\Behat\Tester\Result\SkippedStepResult; |
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use Behat\Behat\Tester\Result\StepResult; |
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use Behat\Behat\Tester\Result\UndefinedStepResult; |
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use Behat\Behat\Tester\StepTester; |
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use Behat\Gherkin\Node\FeatureNode; |
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use Behat\Gherkin\Node\StepNode; |
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use Behat\Testwork\Call\CallCenter; |
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use Behat\Testwork\Call\CallResult; |
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use Behat\Testwork\Environment\Environment; |
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use Behat\Testwork\Tester\Setup\SuccessfulSetup; |
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use Behat\Testwork\Tester\Setup\SuccessfulTeardown; |
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/** |
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* Tester executing step tests in the runtime. |
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* |
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* This class is a copy of \Behat\Behat\Tester\Runtime\RuntimeStepTester by Konstantin Kudryashov <[email protected]>. |
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* It has a modified testDefinition() method to implement the retry functionality. |
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* |
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* I would ideally like to extend or wrap the existing RuntimeStepTester, but neither is possible because the class |
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* is final, and the method is private. v_v |
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*/ |
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final class RuntimeStepTester implements StepTester |
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{ |
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/** Number of seconds to attempt "Then" steps before accepting a failure */ |
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public static $timeout; |
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/** @var int number of nanoseconds to wait between each retry of "Then" steps */ |
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public static $interval; |
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/** @var array list of Gherkin keywords */ |
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protected static $keywords = ['Given', 'When', 'Then']; |
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/** |
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* @var DefinitionFinder |
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*/ |
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private $definitionFinder; |
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/** |
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* @var CallCenter |
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*/ |
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private $callCenter; |
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/** @var string The last "Given", "When", or "Then" keyword encountered */ |
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protected $lastKeyword; |
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/** |
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* Initialize tester. |
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* |
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* @param DefinitionFinder $definitionFinder |
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* @param CallCenter $callCenter |
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*/ |
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public function __construct(DefinitionFinder $definitionFinder, CallCenter $callCenter) |
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{ |
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$this->definitionFinder = $definitionFinder; |
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$this->callCenter = $callCenter; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setUp(Environment $env, FeatureNode $feature, StepNode $step, $skip) |
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{ |
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return new SuccessfulSetup(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function test(Environment $env, FeatureNode $feature, StepNode $step, $skip = false) |
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{ |
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$this->updateLastKeyword($step); |
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try { |
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$search = $this->searchDefinition($env, $feature, $step); |
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$result = $this->testDefinition($env, $feature, $step, $search, $skip); |
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} catch (SearchException $exception) { |
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$result = new FailedStepSearchResult($exception); |
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} |
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return $result; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function tearDown(Environment $env, FeatureNode $feature, StepNode $step, $skip, StepResult $result) |
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{ |
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return new SuccessfulTeardown(); |
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} |
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/** |
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* Searches for a definition. |
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* |
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* @param Environment $env |
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* @param FeatureNode $feature |
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* @param StepNode $step |
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* |
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* @return SearchResult |
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*/ |
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private function searchDefinition(Environment $env, FeatureNode $feature, StepNode $step) |
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{ |
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return $this->definitionFinder->findDefinition($env, $feature, $step); |
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} |
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/** |
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* Tests found definition. |
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* |
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* @param Environment $env |
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* @param FeatureNode $feature |
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* @param StepNode $step |
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* @param SearchResult $search |
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* @param bool $skip |
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* |
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* @return StepResult |
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*/ |
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private function testDefinition(Environment $env, FeatureNode $feature, StepNode $step, SearchResult $search, $skip) |
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{ |
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if (!$search->hasMatch()) { |
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return new UndefinedStepResult(); |
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} |
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if ($skip) { |
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return new SkippedStepResult($search); |
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} |
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$call = $this->createDefinitionCall($env, $feature, $search, $step); |
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$result = $this->makeCall($call); |
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return new ExecutedStepResult($search, $result); |
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} |
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/** |
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* Records the keyword for the step. |
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* |
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* This allows us to know where we are when processing And or But steps. |
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* |
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* @param StepNode $step |
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* @return void |
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*/ |
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protected function updateLastKeyword(StepNode $step) |
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{ |
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$keyword = $step->getKeyword(); |
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if (in_array($keyword, self::$keywords)) { |
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$this->lastKeyword = $keyword; |
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} |
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} |
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/** |
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* Calls the specified definition, either directly, or via spin() if self::$timeout is not 0. |
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* |
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* @param DefinitionCall $call the call to make. |
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* @return CallResult the result of the call. |
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*/ |
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protected function makeCall(DefinitionCall $call) |
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{ |
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// @todo We can only "spin" if we are interacting with a remote browser. If the browser is |
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// running in the same thread as this test (such as with Goutte or Zombie), then spinning |
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// will only prevent that process from continuing, and the test will either pass immediately, |
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// or not at all. We need to find out how to check what Driver we're using... |
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if ($this->lastKeyword == 'Then' && self::$timeout) { |
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return $this->spin(function () use ($call) { |
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return $this->callCenter->makeCall($call); |
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}); |
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} else { |
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return $this->callCenter->makeCall($call); |
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} |
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} |
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/** |
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* Continually calls an assertion until it passes or the timeout is reached. |
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* |
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* @param callable $lambda The lambda assertion to call. Must take no arguments and return |
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* a CallResult. |
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* @return CallResult |
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*/ |
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protected function spin(callable $lambda) |
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{ |
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$start = microtime(true); |
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$result = null; |
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while (microtime(true) - $start < self::$timeout) { |
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/** @var $result CallResult */ |
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$result = $lambda(); |
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if (!$result->hasException() || ($result->getException() instanceof PendingException)) { |
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break; |
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} |
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time_nanosleep(0, self::$interval); |
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} |
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return $result; |
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} |
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/** |
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* Creates definition call. |
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* |
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* @param Environment $env |
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* @param FeatureNode $feature |
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* @param SearchResult $search |
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* @param StepNode $step |
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* |
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* @return DefinitionCall |
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*/ |
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private function createDefinitionCall(Environment $env, FeatureNode $feature, SearchResult $search, StepNode $step) |
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{ |
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$definition = $search->getMatchedDefinition(); |
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$arguments = $search->getMatchedArguments(); |
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return new DefinitionCall($env, $feature, $step, $definition, $arguments); |
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} |
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} |
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