Test for read -r.

gold/nix.sh

@@ -1,7 +1,7 @@
#!/bin/bash
#
# Usage:
#   ./nix.sh <function name>
# Copied from hard-coded-descriptors/ in oilshell/blog-code, which was copied
# from Nix setup.sh.  See issue #26.

set -o nounset
set -o pipefail

spec/builtins.test.sh

@@ -210,6 +210,13 @@ argv.py $x $REPLY
# stdout: ['1234', '12']
# N-I dash stdout: []

### read -r ignores backslashes
echo 'one\ two' > $TMP/readr.txt
read escaped < $TMP/readr.txt
read -r raw < $TMP/readr.txt
argv "$escaped" "$raw"
# stdout: ['one two', 'one\\ two']

### get umask
umask | grep '[0-9]\+'  # check for digits
# status: 0

test/spec.sh

@@ -253,7 +253,7 @@ test-builtin() {
}

builtins() {
  sh-spec spec/builtins.test.sh --osh-failures-allowed 2 \
  sh-spec spec/builtins.test.sh --osh-failures-allowed 3 \
    ${REF_SHELLS[@]} $OSH "$@"
}