Should "No Tests" indicate a failure?

[nickrobinson251]

This was raised in #26166 but I think no explicit decision was made.

Current behaviour is not indiciative of "no tests" being an issue at all.

julia> using Test

julia> @testset "" begin
           ""
       end
Test Summary: |
              | No tests
Test.DefaultTestSet("", Any[], 0, false)

One possibility would simply be to use color to print the "No tests" message in the "warning" (yellow) color, rather than the more neutral "info" (blue color), though of course that doesn't affect the no-color output.

I've no opinion here, but it was raised at work and i couldn't find another issue/discussion on it.

[DilumAluthge]

I think it makes sense for an empty testset (a testset with no tests) to throw an error. After all, in what situation would a testset with no tests be the desired behavior?

This would probably be breaking, right? So in Julia 1.x it would print a warning, and in Julia 2.0 it would throw an error.