What does "0 skipped, 0 blacklisted" mean in the Qt Unit Test framework?

When I run my Qt Unit Test project, it ends with a summary that looks like this:

Totals: 28 passed, 1 failed, 0 skipped, 0 blacklisted

The "passed" and "failed" categories are obvious, but what is the meaning of "skipped" and "blacklisted"?

Under what conditions will the test framework skip a test? How is that different from blacklisting it?

My Qt version is Qt 5.4.1.