Test http://www.w3.org/2001/DOM-Test-Suite/level1/core/elementgetattributenodenull

<test name='elementgetattributenodenull' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>elementGetAttributeNodeNull</title>
          <creator>NIST</creator>
          <description> The "getAttributeNode(name)" method retrieves an attribute node by name. It should return null if the "name" attribute does not exist. Retrieve the last child of the first employee and attempt to retrieve a non-existing attribute. The method should return "null". The non-existing attribute to be used is "invalidAttribute". </description>
          <contributor>Mary Brady</contributor>
          <date qualifier='created'>2001-08-17</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-217A91B8'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='testEmployee' type='Element'/>
     <var name='domesticAttr' type='Attr'/>
     <load var='doc' href='staff' willBeModified='true'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"address"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='0' var='testEmployee'/>
     <getAttributeNode obj='testEmployee' var='domesticAttr' name='"invalidAttribute"'/>
     <assertNull actual='domesticAttr' id='elementGetAttributeNodeNullAssert'/>
</test>

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