Adds test

[davidporter-id-au]

What changed?

test with

go  test -tags test_dep  ./tests/ -run '^TestScheduleVisibilityWriteBenchmark$' -v -count=1 -timeout 300s 2>&1 \
  | grep -A12 "schedule visibility-write benchmark"

Why?

Tell your future self why have you made these changes.

How did you test it?

• built
• run locally and tested manually
• covered by existing tests
• added new unit test(s)
• added new functional test(s)

Potential risks

Any change is risky. Identify all risks you are aware of. If none, remove this section.