In a casual conversation, if someone ask "how was the test", are they always asking about the test in general? And if someone tells you, "today's test was okay"(be it as a reply to your question or on their own) are they always talking about the test in general or could it possibly mean it was okay for them?
In the linked thread a distinction is made between a question that asks about the nature of the test (was it hard, easy etc?), and a question that asks about the results (grades) achieved in the test. You may not know the results until several days later.
However, if I had just left the exam room and someone asked me "How was the test?", I would take it as a general question about both the nature of the test and how well I thought I'd done in it, whether I already knew my grade or not. "It was pretty tough but I think I did alright".