I am running iOS tests on Circle CI using Xcode 6.4 and iOS 8.4 with this command:
xctool -workspace ios.xcworkspace -scheme ios test -sdk iphonesimulator8.4
But when the simulator runs, it fails to run my tests and I receive this error:
Test did not run: The simulator failed to start, or the TEST_HOST application failed to run. Simulator error: Exception encountered connecting to CoreSimulatorBridge: Unable to connect to CoreSimulatorBridge
Looking at the logs, it looks like the simulator actually tries to run against iOS 9:
run-test iosTests.xctest (iphonesimulator9.0, iPhone 4s, application-test)
Is there a way to force it to run on iOS 8.4 so the tests would run?
I had the same issue recently on Circle CI. I'm not sure if it's related to xctool's newest version (0.2.7) or not, but adding this fixed it for me:
-destination platform='iOS Simulator,OS=8.4,name=iPhone 6'
So the full command in your case should be:
xctool -workspace ios.xcworkspace -scheme ios test -sdk iphonesimulator8.4 -destination platform='iOS Simulator,OS=8.4,name=iPhone 6'