public function testAppender()
{
$logger = new Logger('logger');
/** @var $appender AppenderAbstract */
$appender = $this->getMockForAbstractClass(AppenderAbstract::class);
/** @var $appenderSecond AppenderAbstract */
$appenderSecond = clone $appender;
$this->assertSame([], $logger->getAppenders());
$logger->addAppender($appender);
$this->assertSame([$appender], $logger->getAppenders());
$logger->addAppender($appender);
$this->assertSame([$appender], $logger->getAppenders());
$logger->addAppender($appenderSecond);
$this->assertSame([$appender, $appenderSecond], $logger->getAppenders());
$logger->addAppender($appenderSecond);
$this->assertSame([$appender, $appenderSecond], $logger->getAppenders());
$logger->removeAppender($appenderSecond);
$this->assertSame([$appender], $logger->getAppenders());
$logger->removeAppender($appender);
$this->assertSame([], $logger->getAppenders());
}