Elgg\HooksRegistrationServiceTest::testOnlyOneHandlerUnregistered PHP Method

    public function testOnlyOneHandlerUnregistered()
    {
        $this->mock->registerHandler('foo', 'bar', 'callback');
        $this->mock->registerHandler('foo', 'bar', 'callback');
        $this->assertTrue($this->mock->unregisterHandler('foo', 'bar', 'callback'));
        $this->assertSame([500 => ['callback']], $this->mock->getAllHandlers()['foo']['bar']);
    }