cmd: test: fix handling of single-argument form of test

POSIX states that

  0 arguments:
      Exit false (1).
  1 argument:
      Exit true (0) if $1 is not null; otherwise, exit false.

and at least bash and busybox sh behave that way.

The current 'argc < 3' does the right thing for a non-existing or
empty argv[1], but not for a non-empty argv[1]. Fix that and add
corresponding test cases.

Signed-off-by: Rasmus Villemoes <[email protected]>
Tested-by: Anshul Dalal <[email protected]>

0 files changed, 0 insertions, 0 deletions