/**
  * @covers WindowsAzure\Common\Internal\Atom\Category::writeXml
  */
 public function testCategoryWriteXmlInvalidParameter()
 {
     // Setup
     $this->setExpectedException(get_class(new \InvalidArgumentException()));
     $category = new Category();
     // Test
     $category->writeXml(null);
     // Assert
 }