When no JUnit results file is available, it may prove useful to check the following:
An SLA does exist.
The SLA has alerts specified.
The alerts are applicable to some part of the project.
The associated parts of the project are actually being reached and no errors are preventing those parts of the project from running. Creating an alert that applies to the entire project is an easy way to verify this.
The SLA is applicable to the scenario that is being run.