Restore two commented-out tests from plus-minus1.0 to a new file.

These two cases pass on -CURRENT but fail on stable/8.

Reviewed by:	jilles

tools/regression/bin/sh/expansion/plus-minus1.0

@@ -43,9 +43,6 @@ testcase 'set -- ${e:+$w"$e"}'			'0|'
 testcase 'set -- ${w:+"$w"}'			'1|a b c'
 testcase 'set -- ${w:+$w"$w"}'			'3|a|b|ca b c'
 
-# These two are known broken in FreeBSD /bin/sh
-#testcase 'set -- ${s+a b}'			'2|a|b'
-#testcase 'set -- ${e:-a b}'			'2|a|b'
 testcase 'set -- "${s+a b}"'			'1|a b'
 testcase 'set -- "${e:-a b}"'			'1|a b'
 testcase 'set -- ${e:-\}}'			'1|}'

tools/regression/bin/sh/expansion/plus-minus7.0

@@ -0,0 +1,26 @@
+# $FreeBSD$
+
+e= s='foo'
+failures=''
+ok=''
+
+testcase() {
+	code="$1"
+	expected="$2"
+	oIFS="$IFS"
+	eval "$code"
+	IFS='|'
+	result="$#|$*"
+	IFS="$oIFS"
+	if [ "x$result" = "x$expected" ]; then
+		ok=x$ok
+	else
+		failures=x$failures
+		echo "For $code, expected $expected actual $result"
+	fi
+}
+
+testcase 'set -- ${s+a b}'			'2|a|b'
+testcase 'set -- ${e:-a b}'			'2|a|b'
+
+test "x$failures" = x