bug#42883: Selecting a subset of tests in recursive make causes unnecessary failures

[Karl Berry]

Hi Glenn,

    I noticed that when specifying a subset of tests to run via the TESTS
    environment variable, I could have all tests complete successfully

Thanks for the report. That does seem suboptimal, but on the other hand,
subsets of tests are a complication. Does it work to override SUBDIRS
along with TESTS? As in (thanks to Jim):
  env TESTS=grub_cmd_echo make -e check VERBOSE=yes SUBDIRS=

Thanks,
Karl