Test http://www.w3.org/2001/DOM-Test-Suite/level2/core/getAttributeNodeNS01

<test name='getAttributeNodeNS01' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-2 dom2.xsd'>
     <metadata>
          <title>getAttributeNodeNS01</title>
          <creator>NIST</creator>
          <description> The "getAttributeNodeNS(namespaceURI,localName)" method retrieves an attribute node by local name and NamespaceURI. Retrieve the first emp:address element node. The getAttributeNodeNS method returns an Attr node, the "value" can be examined to ensure the proper attribute node was retrieved. This attribute value should be null since there is no such attribute. </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/DOM-Level-2-Core/core#ID-ElGetAtNodeNS'/>
</metadata>
     <var name='namespaceURI' type='DOMString' value='"http://www.nist.gov"'/>
     <var name='localName' type='DOMString' value='"invalidlocalname"'/>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='testAddr' type='Element'/>
     <var name='attribute' type='Attr'/>
     <load var='doc' href='staffNS' willBeModified='false'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"emp:address"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='0' var='testAddr'/>
     <assertNotNull actual='testAddr' id='empAddrNotNull'/>
     <getAttributeNodeNS obj='testAddr' var='attribute' namespaceURI='namespaceURI' localName='localName'/>
     <assertNull actual='attribute' id='throw_Null'/>
</test>

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