Visual Studio 2015 not showing unit tests in Test Explorer

I am using Visual Studio 2015 with the XrmToolKit and have 20+ unit tests that I need to run on my current code.  The unit tests were appearing in the Test Explorer at first but then stopped appearing.  Not exactly sure what happened but seemed to occur around a time when I accidently clicked Run All Tests.

This is what appears now:

Test Explorer
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kaufmed 👽Commented:
How long are your unit tests' names? I determined, through trial and error, that unit test names can't be longer than like 174 characters. Anything greater, and the tests no longer run.

Also, the Test Explorer will only show tests once you build your project(s).

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apollo7Author Commented:
The names of my unit tests are short but I worked a bit on rebuilding my projects.

I discovered some tests that couldnt be found and some pending changes that needed to be reverted, this showed some errors which I corrected until I got a clean build.  

After this, my unit tests showed up again in Test Explorer.

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