I need to know of a tool that will allow me to test a web application without having the GUI already in place. Is this even possible? If so, please just point me in the right direction. What tool(s) can accomplish this? In doing some research I’ve heard the term “scripting interface” does this term apply to testing without a GUI. The web application is written in DotNetNuke.
Since DotNetNuke is written in .Net, you could use NUnit to start testing the API on the backend. You can find NUnit at http://nunit.org/. It's an open source unit testing platform for .Net apps.
You suppose you could also start stressing the database server to see how that performs. There is a tool called Microsoft Application Center Test (MS ACT) that comes with VisualStudio.Net Enterprise Edition that could help you out with this.
Nunit is a good starting point, ACT is also valid, in addition if you have the new beta version of Visual Studio the testing tools (team test now) have been updated in there too to work more effectivily through the IDE.
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