How to run single test case in Xcode?

Xcode 4 now have this feature. Simply create a “run scheme”  that has the test cases that you want to run.

1. Open menu “Product|Edit Scheme…”
2. Click on “Edit…”
3. In the left pane, expand the “Test” section.
4. In the right pane, expand the test bundle and uncheck the test cases you don’t need to run.