title: Xcode does not recognize new test functions
body: <p>I've just started writing unit tests and I've encountered an issue. So far I've dug through different blogs on google and stackoverflow but I haven't been able to resolve this. </p>
  
  <p>Every time I write a function to be tested the run button (shaped like a diamond) does not appear. The only run buttons that do show up are the default functions created by Xcode when you create a new unit test target.</p>
  
  <p>Here's an example of the issues.</p>
  
  <p><a href="https://i.stack.imgur.com/hkZwA.png" rel="noreferrer">Xcode screenshot</a></p>
  
  <p>Could it be a bug or am I missing something?</p>