On freeformatter.com/ you have many free online tools for developers. The tools contain converter, formatters, decryptors, validators and many more. It could be used for XML, HTML, SQL, JSON…
Free online tools for developers
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How to unit test a web service
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To test your web service, you can use Smock. Smock compares your request with the response by XML files. You just need a response.xml file with your response and a request.xml file with your request.