Random Tape Test failures

The current test set-up exhibits a broken behaviour on Travis-CI. On some runs, we show a missing test in running `npm test` on the `node/nepomuk` directory.

The test is not failing itself but rather seems to depend on some sort of race condition, shutting down the tape test before succeeding in its execution, showing `test count !== plan` as error.

Start by running `npm test` in `node/nepomuk` and inspect the tape test setup involved in the reported missing test. Compare local behavior with the Travis-CI run and trace when the test process shuts down. Done means the planned tape tests consistently execute and the test count matches the plan.

Written by the indexing model from the issue text.