tests/Makefile: bikeshedding, 'make failed_should' is easier to complete

See #3033.
3 jobs for dev in 27 seconds
Status Job ID Name Coverage
  Test Tools
passed #64027
test_tools

00:00:04

 
  Test Quality
passed #64028
web
code_quality

00:00:11

 
  Test Unit
passed #64029
web
test_browser_unit

00:00:10