[Xmlgraphics-fop Wiki] Update of "HowToCreateLayoutEngineTests" by JeremiasMaerki

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The following page has been changed by JeremiasMaerki:
http://wiki.apache.org/xmlgraphics-fop/HowToCreateLayoutEngineTests

The comment on the change is:
some tweaking

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  {{{test/layoutengine}}}
  
- http://cvs.apache.org/viewcvs.cgi/xml-fop/test/layoutengine/
+ http://svn.apache.org/viewcvs.cgi/xmlgraphics/fop/trunk/test/layoutengine/
  
  == How do I run them? ==
  
@@ -75, +75 @@

  
  Now, when you are creating a test case you can use the XSLT stylesheet called "testcase2fo.xsl" if you want to manually run it through FOP (or any other XSL-FO implementation). The stylesheet basically extracts the XSL-FO document from the XML file.
  
- When the JUnit checks for the layout engine are run, the following happens. The checks are extracted from the XML file and each of them is checked against the result from a FOP processing run. Most tests will check against the "Area Tree XML" that is generated by FOP's XMLRenderer. From the command-line you can access it if you use "-at" instead of "-pdf", for example.
+ When the JUnit checks for the layout engine are run, the following happens. The checks are extracted from the XML file and each of them is checked against the result from a FOP processing run. Most tests will check against the "Area Tree XML" that is generated by FOP's XMLRenderer. From the command-line you can access it if you use "-at" instead of "-pdf", for example. These checks are normally XPath queries to the area tree XML (see "true" and "eval" checks below).
  
  When you run test cases the generated Area Tree XML is written to the {{{build/test-results/layoutengine}}} directory.
  

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