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The good news is that you should be able to say that the actual results of the original system define the expected results of the new system and this is a BIG leg up for defining test cases.
Automated Unit Testing
Another extremely powerful technique to implement as part of your migration effort is automated unit testing. Automated unit testing is a natural extension of GMM's automated conversion pipeline:
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That said, the GMM assumes a working source codebase, not a frozen source codebase. The legacy application is allowed to be maintained and enhanced for ongoing maintenance. Updated versions of the VB6/ASP/COM codebase may enter the translation refinement process as they become available – typically on the same release cycle as the legacy application.
Forms Designer Test
The Forms Designer Test verifies that the designer code in your .NET UI classes (Forms and UserControls) can run correctly in the visual Studio forms designer:
| Test Plan | Notes |
| Steps | 1. Open your .NET project in Visual Studio. 2. Open each UI class in the .NET forms designer. |
| Expected Results | The form or control is rendered properly and looks well formed. |
| Error Condition | The UI class is not rendered properly, possibly all you get is an error listing. |
| Troubleshooting | .NET Designer errors are difficult to troubleshoot because they typically occur in logic that instantiates UI controls which is hard to access and debug. You will begin the troubleshooting problem by reviewing the designer error report. |
| Resolution | .NET designer problems can occur for a variety of reasons ranging from missing externals, to crude syntax errors, to more advanced compile time validation. |
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