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

<test name='nodegetnextsiblingnull' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>nodeGetNextSiblingNull</title>
          <creator>NIST</creator>
          <description> If there is not a node immediately following this node the "getNextSibling()" method returns null. Retrieve the first child of the second employee and invoke the "getNextSibling()" method. It should be set to null. </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-6AC54C2F'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='employeeNode' type='Node'/>
     <var name='lcNode' type='Node'/>
     <var name='nsNode' type='Node'/>
     <load var='doc' href='staff' willBeModified='false'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"employee"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='1' var='employeeNode'/>
     <lastChild interface='Node' obj='employeeNode' var='lcNode'/>
     <nextSibling interface='Node' obj='lcNode' var='nsNode'/>
     <assertNull actual='nsNode' id='nodeGetNextSiblingNullAssert1'/>
</test>

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