can't add unit testing for a project

I have a cocoa project which contains two target apps,one is UI app,the other is logic app,when run UI app will launch logic app.the logic app build products path is in UI app contents. Now I want to add a unit test target for logic app,when I set the bundle loader and test host with right path,but when I test the target,the unit test not run and disappear "Bundle injected into '/Users/http://ift.tt/2bot3fu' but XCInjectBundleInto environment variable set to '/Users/http://ift.tt/2b632hB'" in debug console.The fuseservice app is what I want to add unit test. I don't know how to solve this problem