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<?php |
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declare(strict_types=1); |
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namespace EventSauce\EventSourcing\TestUtilities; |
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use EventSauce\EventSourcing\Message; |
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use EventSauce\EventSourcing\MessageConsumer; |
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use Exception; |
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use PHPUnit\Framework\TestCase; |
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abstract class MessageConsumerTestCase extends TestCase |
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{ |
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/** |
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* @var MessageConsumer |
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*/ |
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protected $messageConsumer; |
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/** |
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* @var Exception|null |
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*/ |
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private $caughtException; |
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/** |
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* @var Exception|null |
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*/ |
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private $theExpectedException; |
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/** |
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* @var bool |
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*/ |
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private $assertedScenario = false; |
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/** |
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* @var callable |
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*/ |
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private $assertionCallback; |
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abstract public function messageConsumer(): MessageConsumer; |
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/** |
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* @before |
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*/ |
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public function setupMessageConsumer(): void |
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{ |
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$this->messageConsumer = $this->messageConsumer(); |
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$this->assertedScenario = false; |
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} |
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/** |
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* @before |
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*/ |
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public function unsetMessageConsumer(): void |
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{ |
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unset($this->messageConsumer); |
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} |
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/** |
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* @return $this |
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*/ |
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protected function given(object ...$eventsOrMessages) |
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{ |
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$this->processMessages($eventsOrMessages); |
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return $this; |
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} |
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/** |
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* @return $this |
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*/ |
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public function when(object ...$eventsOrMessages) |
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{ |
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try { |
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$this->processMessages($eventsOrMessages); |
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} catch (Exception $exception) { |
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$this->caughtException = $exception; |
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} |
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return $this; |
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} |
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/** |
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* @return $this |
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*/ |
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public function expectToFail(Exception $expectedException) |
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{ |
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$this->theExpectedException = $expectedException; |
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return $this; |
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} |
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/** |
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* @param object[] $eventsOrMessages |
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*/ |
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protected function processMessages(array $eventsOrMessages): void |
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{ |
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$messages = $this->ensureEventsAreMessages($eventsOrMessages); |
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foreach ($messages as $message) { |
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$this->messageConsumer->handle($message); |
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} |
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} |
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/** |
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* @return Message[] |
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*/ |
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private function ensureEventsAreMessages(array $events): array |
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{ |
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return array_map(function (object $event) { |
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return $event instanceof Message ? $event : new Message($event); |
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}, $events); |
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} |
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/** |
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* @after |
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* |
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* @throws Exception |
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*/ |
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protected function assertScenario(): void |
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{ |
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// @codeCoverageIgnoreStart |
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if ($this->assertedScenario) { |
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return; |
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} |
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// @codeCoverageIgnoreEnd |
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$this->assertedScenario = true; |
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$this->assertExpectedException($this->theExpectedException, $this->caughtException); |
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if (is_callable($this->assertionCallback)) { |
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($this->assertionCallback)($this->messageConsumer); |
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} |
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} |
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/** |
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* @return $this |
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*/ |
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public function then(callable $assertion) |
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{ |
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$this->assertionCallback = $assertion; |
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return $this; |
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} |
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private function assertExpectedException( |
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Exception $expectedException = null, |
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Exception $caughtException = null |
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): void { |
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if (null !== $caughtException && (null === $expectedException || get_class($expectedException) !== get_class( |
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$caughtException |
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))) { |
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throw $caughtException; |
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} |
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self::assertEquals([$expectedException], [$caughtException], '>> Exceptions are not equal.'); |
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} |
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} |
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