Running all untagged tests except specific tagged ones

[robross0606]

Our project has a lot of test suites. To avoid modifying all of them, we want to run specific tests separately "in band" while the rest can run in parallel. To accomplish this, I annotated a couple files with @group solo but all other files were not tagged at all.

I then ran this which seemed to work:

npx jest --group=solo --coverage=false --maxWorkers='1'

Only the specific tagged test suites were executed as desired. However, I then tried running this:

npx jest --group=-solo --coverage=true

I would have expected this to run all tests that are not tagged with "solo". Instead, everything was run including the tests with @group solo in them.

[robross0606]

This may be the same issue as described in #47 but I'm not sure from the wording.