Add test duration measurement

[mosteo]

Enable time tracking in e3 testsuite

[mosteo]

@Seb-MCaw I'm seeing this test taking almost 3 minutes, do you think this is expected? I see it's a long one so it could be normal.

Running it locally I had to kill it after ~10 minutes, so something seems suspicious.

[Seb-MCaw]

Yes it's always been rather slow, sorry.

I've never seen it take as long as 10mins on Linux, so that would indeed be suspicious (my local machine runs the whole master branch testsuite in less than 2mins). It's less surprising if you're on MacOS, where the compiler (which the test is calling out to repeatedly) seems a lot slower in general.

Let me know if this is an issue, as I'm sure it could easily be improved; perhaps calls to gprbuild could be intercepted by a MockCommand.

[mosteo]

Nevermind my time, that was an unrelated issue. That test takes a bit less than 2 mins in my machine, so it seems everything is as expected. I too had noticed that macOS, particularly x64, is much slower. Thanks!