public function testRevetField()
 {
     $started_with = $this->writer->getName();
     $this->assertFalse($this->writer->isModified());
     $this->assertFalse($this->writer->isModifiedField('name'));
     $this->writer->setName('Lew Nikolajewitsch Tolstoi');
     $this->assertTrue($this->writer->isModified());
     $this->assertTrue($this->writer->isModifiedField('name'));
     $this->writer->revertField('name');
     $this->assertTrue($this->writer->isModified());
     $this->assertTrue($this->writer->isModifiedField('name'));
     $this->assertSame($started_with, $this->writer->getName());
 }