...but there are 13 tests in total, and hence it's reporting only 14% code coverage where running the full test suite would report close to 99% code coverage.
Fixed the issue. Turns out that the test/results folder didn't exist when the tests were being run, and because the logs were being intercepted, it was difficult to see what was going on.
...but there are 13 tests in total, and hence it's reporting only 14% code coverage where running the full test suite would report close to 99% code coverage.