title: No play button in Unit Test in Xcode
body: <p>Sometimes the play button <a href="https://i.stack.imgur.com/3qOGx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3qOGx.png" alt="enter image description here"></a>disappears in Xcode when I want to make a Unit Test (XCTest). For instance there should be a play button to the left of testNSStringUtilities below but there is none. What can I do to get the play button to appear. It seems that sometimes cutting the method and pasting it again helps to get the play button back.</p>
  
  <p><a href="https://i.stack.imgur.com/0XLA2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0XLA2.png" alt="enter image description here"></a></p>