public function testIsSetInitialSortField()
{
$read = $this->definition->getInitialSortField();
$expected = 'created_at';
$this->assertSame($read, $expected);
$this->definition->setInitialSortField('author');
$read = $this->definition->getInitialSortField();
$expected = 'author';
$this->assertSame($read, $expected);
}