Add negative test for unquoted property string
@@ -194,6 +194,7 @@ static const struct {
{ 0, "a=abc,#@!, n=1" }, /* non-ASCII character located */
{ 1, "a='Hello" }, /* Unterminated string */
{ 0, "a=\"World" }, /* Unterminated string */
+ { 0, "a=_abd_" }, /* Unquoted string not starting with alphabetic */
{ 1, "a=2, n=012345678" }, /* Bad octal digit */
{ 0, "n=0x28FG, a=3" }, /* Bad hex digit */
{ 0, "n=145d, a=2" }, /* Bad decimal digit */
