choosetests: return a namedtuple (instead of a tuple) (#42723)

to make it easier to add more information in the future

test/choosetests.jl

@@ -33,15 +33,15 @@ const TESTNAMES = [
 
 """
 
-`tests, net_on, exit_on_error, seed = choosetests(choices)` selects a set of tests to be
+`(; tests, net_on, exit_on_error, seed) = choosetests(choices)` selects a set of tests to be
 run. `choices` should be a vector of test names; if empty or set to
 `["all"]`, all tests are selected.
 
 This function also supports "test collections": specifically, "linalg"
  refers to collections of tests in the correspondingly-named
 directories.
 
-Upon return:
+The function returns a named tuple with the following elements:
  - `tests` is a vector of fully-expanded test names,
  - `net_on` is true if networking is available (required for some tests),
  - `exit_on_error` is true if an error in one test should cancel
@@ -205,5 +205,5 @@ function choosetests(choices = [])
  empty!(tests)
  end
 
- tests, net_on, exit_on_error, use_revise, seed
+ return (; tests, net_on, exit_on_error, use_revise, seed)
 end

test/runtests.jl

@@ -10,7 +10,7 @@ using Base: Experimental
 include("choosetests.jl")
 include("testenv.jl")
 
-tests, net_on, exit_on_error, use_revise, seed = choosetests(ARGS)
+(; tests, net_on, exit_on_error, use_revise, seed) = choosetests(ARGS)
 tests = unique(tests)
 
 if Sys.islinux()