Remove unit testing from Xcode project?
Xcode 7+
Click your project name in the Project Navigator. Then select your Tests target. Click the minus (-) button at the bottom to delete it. (Select everywhere in red in the image below.)
As mentioned in a comment earlier, it is a good idea to do Unit Testing (and UI testing) in your projects. So, if you want to add them back in then just click the plus (+) button.
See also
I suggest to make test in your project.
But in any case, you might to leave there the target.
Otherwise, if you want delete at any cost, you have just to click on your project settings and click on this icon:
You will see your targets and you will can delete the test target. At this point you might want delete the test classes too: on the folder hierarchy, select these and just press backspace, confirming the deletion.