From e18df9a13cd45d3ddcf87e2259f1de5e73a87da7 Mon Sep 17 00:00:00 2001
From: Isaac Yonemoto <isaac.yonemoto@gmail.com>
Date: Wed, 4 Jun 2025 09:17:36 -0400
Subject: [PATCH] failing composition of delete on split insert

---
 test/delta/delta/compose_test.exs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/delta/delta/compose_test.exs b/test/delta/delta/compose_test.exs
index 99a6a65..17f3a37 100644
--- a/test/delta/delta/compose_test.exs
+++ b/test/delta/delta/compose_test.exs
@@ -337,4 +337,16 @@ defmodule Tests.Delta.Compose do
       assert Delta.compose(a, b) == expected
     end
   end
+
+  test "regression 6/4/2025" do
+    seq = [
+      %{"attributes" => %{"A" => "B"}, "insert" => "A"},
+      %{"insert" => "BC"},
+      %{"insert" => "E"},
+    ]
+
+    change = [%{"delete" => 2}]
+
+    assert [%{"insert" => "CE"}] = Delta.compose(seq, change)
+  end
 end