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Could not run tests - Solution

Today I have written a test class, having only one test method into it. When I ran the test class to check for code coverage, I got a very strange error saying "could not run tests on <Id of test class>". Whereas it was showing that the test method run successfully with desired result in terms of code coverage. I further tried to update the test class and it again gave very strange error "java.lang.reflect.InvocationTargetException". 

 Initially I thought there is something wrong with my class and cross checked for syntax, identifier etc. After making sure that there is nothing wrong with class, I went to see if anyone faced same issue before. I found actually quite a few and below is solution to get rid of this:-
  1. Go to App Setup >> Develop >> Apex Test Execution and click on "Options".
  2. Uncheck 'Disable Parallel Apex Testing' and click on Ok.
  3. Go to App Setup >> Develop >> Apex Test Execution and click on "View Test History".
  4. Click on 'Clear Test Results' button.


 Go back to test class, try to run it or edit it and you shoule be able to do so.

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