Could not determine bundle identifier for xxxTest TEST_HOST

So after ages of having this issue, we could find the right checkbox to fix this issue.

It somehow sounds weird but the issue was the configurations for the command-line builds inside of the Project settings.

I assume this happens because we always test against the debug configuration and it was set to release. Therefore it did the wrong build for the test host.

This does set the defaultConfigurationName inside of the {projectname}.xcodeproject.

Please comment if you have any more insights of this.