number of selected tests is not reported on collection

[ssbarnea]

While sugar nicely displays how many tests where deselected it does not mention how many tests where selected. This is key information that is missing because based on the params given to pytest or other factors (like environment variables), the number of tests may be very different.

Example:

pytest --collect-only
...
Results (2.37s):
     132 deselected

While user may see a very long list of collected tests, he has no clue how many were collected making very easy to make mistakes.

I would propose adding another line with number of selected or altering the same line and making it look like 132 deselected and 500 selected.