Test are being shown under "External" category in Test Explorer when Grouped By Project
Whenever I try to run tests on Test Explorer from Visual Studio 2012, SOME test are being categorized as "External", even though the Group By is set as "Group By Project" 
Then the source code is not recognized
Solution
This is due the pdb file is not included in the compilation. If you're compiling in a solution configuration other than debug you must ensure that pdb is included.
To achieve that you must open the advanced build setting:
- Right click on project and select properties
- Click on build tab
- Check that your configuration is selected in the "Configuration" dropdown
- Click on advanced button.
In the new window you must select "pdb-only" in the debug info dropdown.
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