Buggy unit test

I came yesterday to the (terrible) conclusion that one of my unit tests was buggy .
My question is now : should we unit test our unit tests….
 
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3 responses to “Buggy unit test

  1. Your tested code should help to test your unit tests.
     
    You can do mutating tests.
    See MSDN Magazine of this month.
    Unfortunately there is no tool for doing that automatically (yet ;-)).
     

  2. If you write your test before you write your code, you will see if it works (it should fail)
    But the intention of a Unit test is not to see it works. It is to see it keeps working the way it worked before.
     
    You can never have everything tested. So your test only prove the code has the same quality as before. What worked before still works. Nothing more.
    y
     

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