Swift - Unit testing functions that involve IBOutlets? -

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I am setting up a unit test for my SWIFT project and I'm having trouble testing the class function in which Updating IBoletlet is included.

I have a function, validateUrl, which expects to pass a string, then it validates if it is valid, it enables UIButton, if it is invalid, then it Disables UIButton when I run a test that calls this function, the app crashes on the line of code that enable or disable UIButton. Both the storyboard and the controllers have a proper test goal set.

This line of code: 

  self.submitButton.enabled = true // Enable the Submit button

with this error Exits: 

  Fatal error: Unexpectedly found zero while unwrapping an alternate value -text "itemprop =" text "> 
 You have to start the view controller using the storyboard. See the document here: 
 
 If you start the visual controller directly, then it will not have any connection because in this case the VC does not know about the storyboard itself.

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