From 0e8f620f15592f66e733cc60dbaa722b183b0abf Mon Sep 17 00:00:00 2001
From: Ben Burwell <ben@benburwell.com>
Date: Thu, 19 Sep 2019 22:40:43 -0400
Subject: Remove dead code, fix package, add long test

---
 caesar.go | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'caesar.go')

diff --git a/caesar.go b/caesar.go
index 4829e6a..9e36d76 100644
--- a/caesar.go
+++ b/caesar.go
@@ -34,6 +34,9 @@ func (rr RuneRange) size() int {
 // shift shifts r by d within the range, modulo the size of the range.
 func (rr RuneRange) shift(r rune, d int) rune {
 	pos := int(r - rr.Start)
+	for d < 0 {
+		d = rr.size() + d
+	}
 	newPos := (pos + d) % rr.size()
 	return rr.Start + rune(newPos)
 }
-- 
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