Improve terse test output.

[nnethercote]

The current terse output gives 112 chars per line, which causes
wraparound for people using 100 char wide terminals, which is very
common.

This commit changes it to be exactly 100 wide, which makes the output
look much nicer.

[rust-highfive]

r? @kennytm

(rust-highfive has picked a reviewer for you, use r? to override)

[nnethercote]

Before:

After:

I have been seeing this output for years, but had never thought about how it was wrapping, until today when I ran the tests in a wider than usual terminal window and immediately saw how much better it looked.

The only downside of the change is that the increments are now 88 instead of 100. Less intuitive, but luckier :)

[fee1-dead]

I wonder if instead of using a magic number to determine how many test cases to display in a line, perhaps we could detect the terminal size and change the number of test cases in a row to match?

[nnethercote]

I wonder if instead of using a magic number to determine how many test cases to display in a line, perhaps we could detect the terminal size and change the number of test cases in a row to match?

Quite possibly, but that takes us into perfect-is-the-enemy-of-good territory. A follow-up?

[nnethercote]

@bors rollup=always

[Dylan-DPC]

@bors r+ rollup

[bors]

📌 Commit b72a7fb has been approved by Dylan-DPC