internal/diff/testdata/start.txt

-- old --
e
pi
4
5
6
7
8
9
10
-- new --
1
2
3
4
5
6
7
8
9
10
-- diff --
diff old new
--- old
+++ new
@@ -1,5 +1,6 @@
-e
-pi
+1
+2
+3
 4
 5
 6