It's blocked by the fact that we send fixtures out to either (or both) issue or verify...so the test suite is only currently handling whether the receiving end can receive and process valid inputs (or chokes on invalid ones). It doesn't currently test received data it hasn't previously known about. Which makes this test particularly problematic.
This test needs writing: https://github.com/w3c/vc-data-model-2.0-test-suite/blob/a9f216070c2ee34d0264094e034ed4a0af1fd860/tests/4-9-validity-period.js#L116-L126
It's blocked by the fact that we send fixtures out to either (or both) issue or verify...so the test suite is only currently handling whether the receiving end can receive and process valid inputs (or chokes on invalid ones). It doesn't currently test received data it hasn't previously known about. Which makes this test particularly problematic.