Add some tests for r194975 and r194977.

Approved by:	ed (mentor) (implicit)

tools/regression/bin/sh/expansion/ifs1.0

@@ -0,0 +1,35 @@
+# $FreeBSD$
+
+c=: e= s=' '
+failures=''
+ok=''
+
+check_result() {
+	if [ "x$2" = "x$3" ]; then
+		ok=x$ok
+	else
+		failures=x$failures
+		echo "For $1, expected $3 actual $2"
+	fi
+}
+
+IFS=' 	
+'
+set -- a ''
+set -- "$@"
+check_result 'set -- "$@"' "($#)($1)($2)" "(2)(a)()"
+
+set -- a ''
+set -- "$@"$e
+check_result 'set -- "$@"$e' "($#)($1)($2)" "(2)(a)()"
+
+set -- a ''
+set -- "$@"$s
+check_result 'set -- "$@"$s' "($#)($1)($2)" "(2)(a)()"
+
+IFS="$c"
+set -- a ''
+set -- "$@"$c
+check_result 'set -- "$@"$c' "($#)($1)($2)" "(2)(a)()"
+
+test "x$failures" = x