It sounds to me like you might have some sort of syntax error in your code/tests that is preventing the test from proceeding. Or, there is some logic error that is generating an error. The messages you're reporting are typically the "last" message in the log. Tests can be configured to stop on an error and so, if there is an error in your tests for whatever reason, it could stop the whole test.
Without knowing more about the contents of your tests, your environment configuration, and the full content of your log, there's not much more specific that I can suggest.