new test for shell options

spec.sh

@@ -278,6 +278,11 @@ var-sub-quote() {
    ${REF_SHELLS[@]} $OSH "$@"
}

sh-options() {
  sh-spec tests/sh-options.test.sh --osh-failures-allowed 0 \
    ${REF_SHELLS[@]} $OSH "$@"
}


# 
# Non-POSIX extensions: arrays, brace expansion, [[, ((, etc.

tests/sh-options.test.sh

@@ -0,0 +1,26 @@
#!/bin/bash
#
# Test set flags, sh flags.

### nounset
echo "[$unset]"
set -o nounset
echo "[$unset]"
echo end  # never reached
# stdout: []
# status: 1
# OK dash status: 2

### -u is nounset
echo "[$unset]"
set -u
echo "[$unset]"
echo end  # never reached
# stdout: []
# status: 1
# OK dash status: 2

### sh -c
$SH -c 'echo hi'
# stdout: hi
# status: 0