In SOA suite, we need to use XSL doing transformation. After the mapping in XSL, by right click on the white space in the middle of mapping, a popup menu will show up. Click the 'Test", a Test XSL Map window pops up. By this window, you can generate source XML and target XML to test the transformation.
If you confirm the default setting is correct, click the OK button to see the testing result. If there is any error, the transformation will be failed and the target XML will not be able to be generated.