Add documentation for running unit tests

README.md

@@ -62,4 +62,16 @@ If you do not have Make installed use `latexmk` (Obtainable e.g. via the MiKTeX
 latexmk refman
 ```
 
-The compiled PDF file is named `refman.pdf` and also stored in the `latex` folder.
+The compiled PDF file is named `refman.pdf` and also stored in the `latex` folder.
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+
+## How to Run the NUnit Test Suite
+
+> The instructions below assume that your working directory is at the project root
+
+This project uses [NUnit](https://nunit.org/) for unit testing. The complete test suite can be run using the dotnet command
+
+```
+dotnet test
+```
+
+or the Visual Studio interface.
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