From a08de1ebdc5ac767a3b7c487e452d4a4627c1c6b Mon Sep 17 00:00:00 2001
From: Tom Burns <tom@burns.ca>
Date: Tue, 31 May 2022 13:18:42 -0400
Subject: [PATCH] add failing test: deleting from array does not update state
 vector

---
 tests/y-array.tests.js | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tests/y-array.tests.js b/tests/y-array.tests.js
index 8cdaac5b..36bf02d7 100644
--- a/tests/y-array.tests.js
+++ b/tests/y-array.tests.js
@@ -630,3 +630,27 @@ export const testRepeatGeneratingYarrayTests30000 = tc => {
   t.skip(!t.production)
   applyRandomTests(tc, arrayTransactions, 30000)
 }
+
+/**
+ * @param {t.TestCase} tc
+ */
+ export const testArrayRemovalUpdatesStateVector = tc => {
+  const doc = new Y.Doc()
+  const root = doc.getMap("root")
+
+  const arr = new Y.Array()
+  root.set("arr", arr)
+  arr.insert(0, ["apple"])
+  arr.insert(1, ["banana"])
+  arr.insert(2, ["citrus"])
+
+  let sv1 = Y.encodeStateVector(doc)
+  console.log(`Before delete, SV=${sv1} JSON=${JSON.stringify(root.toJSON())}`)
+  arr.delete(2)
+  let sv2 = Y.encodeStateVector(doc)
+  console.log(` After delete, SV=${sv2} JSON=${JSON.stringify(root.toJSON())}`)
+
+  if (sv1.length == sv2.length && sv1.every((v, i) => v === sv2[i])) {
+      throw new Error(`State vector should change after document reverted to other state, both are ${sv1}`)
+  }
+}
\ No newline at end of file