From d7ecbdcc1d7c4a92f6b3b581c32d5252b85e31ee Mon Sep 17 00:00:00 2001
From: Max Brunsfeld <maxbrunsfeld@gmail.com>
Date: Tue, 4 Jan 2022 14:55:16 -0800
Subject: [PATCH] Add unit test showing problem with serialization of undo ops

---
 crates/language/src/tests.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/crates/language/src/tests.rs b/crates/language/src/tests.rs
index 4db5e788f8..b09be21d90 100644
--- a/crates/language/src/tests.rs
+++ b/crates/language/src/tests.rs
@@ -780,6 +780,21 @@ async fn test_empty_diagnostic_ranges(mut cx: gpui::TestAppContext) {
     });
 }
 
+#[gpui::test]
+fn test_serialization(cx: &mut gpui::MutableAppContext) {
+    let buffer1 = cx.add_model(|cx| {
+        let mut buffer = Buffer::new(0, "abc", cx);
+        buffer.edit([3..3], "DE", cx);
+        buffer.undo(cx);
+        buffer
+    });
+    assert_eq!(buffer1.read(cx).text(), "abc");
+
+    let message = buffer1.read(cx).to_proto();
+    let buffer2 = cx.add_model(|cx| Buffer::from_proto(1, message, None, cx).unwrap());
+    assert_eq!(buffer2.read(cx).text(), "abc");
+}
+
 fn chunks_with_diagnostics<T: ToOffset + ToPoint>(
     buffer: &Buffer,
     range: Range<T>,