Subtext uses obsolete test framework (MbUnit)

[jeremy-jameson]

The last release of MbUnit was July 19, 2012 and there are several outstanding bugs that make this very painful to use.

For example, you cannot run tests in assemblies compiled in Visual Studio 2015 and later (Gallio exception with visual studio 2015). There is also a nasty bug in the latest version of the Gallio Icarus test runner which causes the "filter" toolbar buttons to do nothing (for example, when trying to filter on failed tests).

Also note that getting MbUnit tests to run in Azure DevOps is most likely an exercise in futility.

For these reasons, the Subtext solution needs to be updated to a modern, supported test framework (such as MSTest).