tests, subprocess: units for cancelled communications

8 jobs for subprocess-cancellable-callback-fix in 11 minutes and 32 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #91661
cross-android_api21_arm64

00:01:33

passed #91662
cross-android_api28_arm64

00:01:33

passed #91663
cross-mingw64

00:02:04

passed #91660
fedora-x86_64

00:04:29

manual #91666
freebsd-11 allowed to fail manual
freebsd-11-x86_64
passed #91664
win32
msys2-mingw32

00:05:48

passed #91665
win32
vs2017-x64

00:05:34

 
  Coverage
passed #91667
coverage

00:01:48

73.4%