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

<test name='hc_elementreplaceexistingattributegevalue' schemaLocation='http://www.w3.org/2001/DOM-Test-Suite/Level-1 dom1.xsd'>
     <metadata>
          <title>hc_elementReplaceExistingAttributeGeValue</title>
          <creator>Curt Arnold</creator>
          <description> If the "setAttributeNode(newAttr)" method replaces an existing Attr node with the same name, then it should return the previously existing Attr node. Retrieve the last child of the third employee and add a new attribute node. The new attribute node is "class", which is already present in this Element. The method should return the existing Attr node(old "class" Attr). This test uses the "createAttribute(name)" method from the Document interface. </description>
          <date qualifier='created'>2002-06-09</date>
          <subject resource='http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core#ID-887236154'/>
</metadata>
     <var name='doc' type='Document'/>
     <var name='elementList' type='NodeList'/>
     <var name='testEmployee' type='Element'/>
     <var name='newAttribute' type='Attr'/>
     <var name='streetAttr' type='Attr'/>
     <var name='value' type='DOMString'/>
     <load var='doc' href='hc_staff' willBeModified='true'/>
     <getElementsByTagName interface='Document' obj='doc' tagname='"acronym"' var='elementList'/>
     <item interface='NodeList' obj='elementList' index='2' var='testEmployee'/>
     <createAttribute obj='doc' var='newAttribute' name='"class"'/>
     <setAttributeNode obj='testEmployee' var='streetAttr' newAttr='newAttribute'/>
     <assertNotNull actual='streetAttr' id='previousAttrNotNull'/>
     <value interface='Attr' obj='streetAttr' var='value'/>
     <assertEquals actual='value' expected='"No"' id='previousAttrValue' ignoreCase='false'/>
</test>

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