You say u are optimistic and the moment u become optimistic. That's what I feel. We should have the tendency to find out something good out of everything. Even if that thing is Negative.

Each and everything has something to teach us. Or, these are we who are supposed to do the reverse, i.e. bring the positive out of everything. Let us take an example, in our life we face challenges on a regular basis and thus there are ample opportunites for us to look at the scenario.

1) If we are helping some dumb guy, we are acting optimistic because, we feel that someday this guy will change.

2) If we are not shouting at something bad happened to us, we are acting optimistic as we feel that the bad time will stay only for short period of time.

3) If we are very happy at some point of time and even in that situation keeping ourselves within the limit and we are not hurting others feeling then we are optimistic because we know ...

so , it can be a long list friend, and same way we can frame our parameters to test if we are optimistic.

I feel, if we act noble, we are. That's the simplest parameter to test it.