Reply to "Didn't have to or needn't have pp"

I also wonder if the knowledge of the speaker plays a part:

Example 1:

On Monday, the teacher said that there would be a test on Wednesday. On Tuesday, the teacher said that the Wednesday test was cancelled.  So, I didn't have to revise on Tuesday night. (a fact)

(As David mentioned above: We didn't/don't have a test today, so there was no need for me to prepare/review for it last night.)

Example 2:

On Monday, the teacher said that there would be a test on Wednesday.  I studied/revised Tuesday evening.  On Wednesday, I arrived and the teacher was absent and the test was cancelled.  So, I had studied/revised for no reason.  I could have watched TV instead.  I needn't have revised. (A slight feeling of annoyance for having wasted my time!)

The test example Ahmed provided ends with an exclamation point, which is why I think the author of the test suggested needn't have revised as the answer.  The respondent was a bit annoyed.

Thoughts?

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