Open TestCaloriesCalculator.dll in NUnit GUI
The way to run NUnit GUI is to open the TestCaloriesCalculator.dll in File-> Open Project dialog in NUnit GUI. The TestCaloriesCalculator.dll is found inside the Debug directory of TestCaloriesCalculator project and it is reconstructed each time you rebuild the project. The exact route(relative to extracted source code location) is:
\179796 Ch03\179796 Ch03_AR Source\TestCaloriesCalculator\TestCaloriesCalculat or\bin\Debug\ TestCaloriesCalculator.dll
I have attached a screenshot of NUnit GUI after executing the tests.