Always report success/failure count

[MichaelChirico]

Closes #2297

Initial proposal

[hadley]

Hmmm, the intent was to report exactly what the problem was, which your change loses. I wonder if we could do something with the bullets?

Expected 1 success and 0 failures
✅ Observed 1 success
❌ Observed 1 failure

See expect_match() for existing art in this direction.

[hadley]

@MichaelChirico how does this look to you?

[MichaelChirico]

Excellent! LGTM