XCode: Can I delete test target?

If by test target, you mean a unit test target, then deleting the test target would mean you couldn't unit test the code in your project. Deleting the test target wouldn't affect the other targets in your project.

To delete a target select your project from the project navigator to open the project editor. Select the target you want to delete from the left side of the project editor and press the Delete key.

Select '.xcodeproj' file from project navigator, then select 'Show project and targets list' icon, select 'target' to delete and then click '-' at bottom