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The Output panel displays a record of log messages recorded by Test Studio throughout runtime. These include build errors that occur when a project is compiled. Its default location is in the middle bottom pane.
To display the Output window whenever you build a project, in the Options dialog box, on the Projects and Solutions > General page, select Show Output window when build starts.
You just need to hover your mouse at the bottom of Test Explorer and drag it up. You can see Test Details summary below of your test regardless of Run or Debug mode.
In the output window there is combobox "show output from". Choose Tests as shown here
The message really should be this
Unexpected error detected. Check the
Output Windowfor details which can be found in theShow output from:section. Then select theTestsdrop down to read the actual error.
For the Tests window is, buried, in the output window. That window acts as the main window that shows the textual Build information; and hides the test result info in another dropdown.
So in the OutputWindow select Tests after a run.
Go to the view tab at the top of your screen, and select output.
If you're looking for the actual issue, for me it was:
vstest.discoveryengine.exe and vstest.executionengine.exe
Open up Task Manager, go to Processes tab, right-click and End Process. Restart Visual Studio.
For me killing vstest.console.exe and vstest.discoveryengine.exe processes did the trick. No need to restart visual studio.
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