[PATCH v2 0/3] test-lib-functions.sh: trickery to make -x less verbose

This series makes the "-x" output less verbose for our various helper functions, mainly using the trickery of feeding "$@" to "test" to rely on it to die when given too many arguments.

Since v1 the only change is adding a comment as suggested by Eric Sunshine, it's not ideal as noted in <87pmyp2led.fsf@evledraar.gmail.com> (I wish these were just in one file, so we could have a comment at the top), but will aid future maintenance anyway.

Ævar Arnfjörð Bjarmason (3):
  test-lib-functions: normalize test_path_is_missing() debugging
  Revert and amend "test-lib-functions: assert correct parameter count"
  test-lib-functions: remove last two parameter count assertions

 t/test-lib-functions.sh | 72 +++++++++++++++++------------------------
 1 file changed, 30 insertions(+), 42 deletions(-)

Range-diff against v1:
1:  a3e20ef18f < -:  ---------- test-lib: split up and deprecate test_create_repo()
2:  c22e3f7764 = 1:  fd33f6d71f test-lib-functions: normalize test_path_is_missing() debugging
3:  6f9e09a201 ! 2:  67ddd821df Revert and amend "test-lib-functions: assert correct parameter count"
    @@ Commit message
     
      ## t/test-lib-functions.sh ##
     @@ t/test-lib-functions.sh: test_external_without_stderr () {
    + }
    + 
      # debugging-friendly alternatives to "test [-f|-d|-e]"
    - # The commands test the existence or non-existence of $1
    +-# The commands test the existence or non-existence of $1
    ++# The commands test the existence or non-existence of
    ++# a given argument.
    ++#
    ++# The pattern of using "$@" to "test" instead of "$1" is not a bug. We
    ++# are counting on "test" to error on too many arguments if more than
    ++# one is given. Checking "$#" explicitly would lead to overly verbose
    ++# -x output.
      test_path_is_file () {
     -	test "$#" -ne 1 && BUG "1 param"
     -	if ! test -f "$1"
4:  b7b11a60bc = 3:  8fd51861b5 test-lib-functions: remove last two parameter count assertions