the test is explicitely checking that it should not find runnable
scripts outside $PATH, *assuming* $PATH does not have . in it

Having '.' in $PATH can be seen as a bad idea (and it most likely is),
but the tests should either remove '.' from $PATH before testing or
ignore that fail if $PATH does have '.', as it is not illegal

$ git-2.19.2/t 504 > prove -v t0061-run-command.sh
t0061-run-command.sh ..
ok 1 - start_command reports ENOENT (slash)
ok 2 - start_command reports ENOENT (no slash)
ok 3 - run_command can run a command
ok 4 - run_command is restricted to PATH
ok 5 - run_command can run a script without a #! line
ok 6 - run_command does not try to execute a directory
ok 7 - run_command passes over non-executable file
ok 8 - run_command reports EACCES
ok 9 - unreadable directory in PATH
ok 10 - run_command runs in parallel with more jobs available than tasks
ok 11 - run_command runs in parallel with as many jobs as tasks
ok 12 - run_command runs in parallel with more tasks than jobs available
ok 13 - run_command is asked to abort gracefully
ok 14 - run_command outputs
ok 15 - GIT_TRACE with environment variables
# passed all 15 test(s)
1..15
ok
All tests successful.
Files=1, Tests=15,  1 wallclock secs ( 0.04 usr  0.01 sys +  0.26 cusr  0.07 csys =  0.38 CPU)
Result: PASS

$ env PATH="$PATH"":." prove -v t0061-run-command.sh
t0061-run-command.sh ..
ok 1 - start_command reports ENOENT (slash)
ok 2 - start_command reports ENOENT (no slash)
ok 3 - run_command can run a command
not ok 4 - run_command is restricted to PATH
#
#               write_script should-not-run <<-\EOF &&
#               echo yikes
#               EOF
#               test_must_fail test-tool run-command run-command should-not-run
#
ok 5 - run_command can run a script without a #! line
ok 6 - run_command does not try to execute a directory
ok 7 - run_command passes over non-executable file
ok 8 - run_command reports EACCES
ok 9 - unreadable directory in PATH
ok 10 - run_command runs in parallel with more jobs available than tasks
ok 11 - run_command runs in parallel with as many jobs as tasks
ok 12 - run_command runs in parallel with more tasks than jobs available
ok 13 - run_command is asked to abort gracefully
ok 14 - run_command outputs
ok 15 - GIT_TRACE with environment variables
# failed 1 among 15 test(s)
1..15
Dubious, test returned 1 (wstat 256, 0x100)
Failed 1/15 subtests

Test Summary Report
-------------------
t0061-run-command.sh (Wstat: 256 Tests: 15 Failed: 1)
  Failed test:  4
  Non-zero exit status: 1
Files=1, Tests=15,  1 wallclock secs ( 0.03 usr  0.00 sys +  0.24 cusr  0.07 csys =  0.34 CPU)
Result: FAIL

-- 
H.Merijn Brand  http://tux.nl   Perl Monger  http://amsterdam.pm.org/
using perl5.00307 .. 5.29   porting perl5 on HP-UX, AIX, and openSUSE
http://mirrors.develooper.com/hpux/        http://www.test-smoke.org/
http://qa.perl.org   http://www.goldmark.org/jeff/stupid-disclaimers/