function ContainerAwareEventDispatcherTest::testHasListenersIsLazy

Same name and namespace in other branches
  1. 9 core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php \Drupal\Tests\Component\EventDispatcher\ContainerAwareEventDispatcherTest::testHasListenersIsLazy()
  2. 8.9.x core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php \Drupal\Tests\Component\EventDispatcher\ContainerAwareEventDispatcherTest::testHasListenersIsLazy()
  3. 10 core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php \Drupal\Tests\Component\EventDispatcher\ContainerAwareEventDispatcherTest::testHasListenersIsLazy()

File

core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php, line 481

Class

ContainerAwareEventDispatcherTest
Unit tests for the ContainerAwareEventDispatcher.

Namespace

Drupal\Tests\Component\EventDispatcher

Code

public function testHasListenersIsLazy() {
    $called = 0;
    $listener = [
        function () use (&$called) {
            ++$called;
        },
        'onFoo',
    ];
    $this->dispatcher
        ->addListener('foo', $listener);
    $this->assertTrue($this->dispatcher
        ->hasListeners());
    $this->assertTrue($this->dispatcher
        ->hasListeners('foo'));
    $this->assertSame(0, $called);
}

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