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I am building an application that queries a web service. The data in the database varies and changes over time. How do I build a unit test for this type of application?
The web service sends back xml or a no search results html page. I cannot really change the web service. My application basically queries the web service using HTTPURLConnection and gets the response as a String.
Hope that helps with more detail.
Abstract out the web service using a proxy that you can mock out. Have your mock web service return various values representing normal data and corner cases. Also simulate getting exceptions from the web service. Make sure you code works under these conditions and you can be reasonably certain that it will work with any values the web service supplies.
Look at jMock for Java mocking.