name: "Builtins: shift"
cases:
  - name: "shift past the end fails with status 1"
    known_failure: true # TODO(shift): fails with status 2, where bash fails with 1
    ignore_stderr: true
    stdin: |
      set -- a
      shift 2
      echo "shift: $?"

  - name: "A non-numeric shift count is misuse, in bash's words"
    known_failure: true # TODO(shift): the error is clap's, not bash's `x: numeric argument required`
    stdin: |
      strip() { sed -E 's/\x1b\[[0-9;]*m//g; s/^[^ ]*: line [0-9]+: //; s/^error: //'; }
      set -- a b
      shift x 2>err.txt
      echo "shift x: $?"
      strip <err.txt
      rm err.txt

  - name: "shift with a negative count reports it and fails with status 1"
    stdin: |
      set -- a b
      shift -1 2>err.txt; echo "shift -1: $? $#"
      [[ -s err.txt ]] && echo "reported"
      shift -0; echo "shift -0: $? $#"
      rm err.txt

  - name: "shift takes --"
    stdin: |
      set -- a b c
      shift -- 2; echo "$? $*"

  - name: "shift with too many arguments abandons the rest of the line"
    known_failure: true # TODO(shift): a usage error with status 2, and the line goes on
    ignore_stderr: true
    stdin: |
      set -- a b
      shift 1 2; echo "same line: $?"
      echo "next line: $? $#"