/**
  * @dataProvider copyProvider
  * @param EntityContent $content
  */
 public function testCopy(EntityContent $content)
 {
     $copy = $content->copy();
     $this->assertNotSame($content, $copy, 'Copy must not be the same instance.');
     $this->assertTrue($content->equals($copy), 'Copy must be equal to the original.');
     $this->assertSame(get_class($content), get_class($copy), 'Copy must have the same type.');
     $this->assertEquals($content->getNativeData(), $copy->getNativeData(), 'Copy must have the same data.');
 }