public function ContainerAwareEventDispatcherTest::testHasListenersIsLazy in Drupal 10

Same name and namespace in other branches

1. 8 core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php \Drupal\Tests\Component\EventDispatcher\ContainerAwareEventDispatcherTest::testHasListenersIsLazy()
2. 9 core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php \Drupal\Tests\Component\EventDispatcher\ContainerAwareEventDispatcherTest::testHasListenersIsLazy()

File

core/tests/Drupal/Tests/Component/EventDispatcher/ContainerAwareEventDispatcherTest.php, line 471

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);
}