Test that errors returned by vim.notify are propagated

tests/Cargo.toml

@@ -13,12 +13,14 @@ neovim-0-9 = ["nvim-oxi/neovim-0-9"]
 neovim-0-10 = ["neovim-0-9", "nvim-oxi/neovim-0-10"]
 neovim-nightly = ["neovim-0-10", "nvim-oxi/neovim-nightly"]
 
-[target.'cfg(not(any(target_os = "windows", target_env = "msvc")))'.dependencies]
+[dependencies]
 all_asserts = "2.3"
+thiserror = { workspace = true }
+
+[target.'cfg(not(any(target_os = "windows", target_env = "msvc")))'.dependencies]
 nvim-oxi = { path = "..", features = ["libuv", "mlua", "test"] }
 
 [target.'cfg(any(target_os = "windows", target_env = "msvc"))'.dependencies]
-all_asserts = "2.3"
 nvim-oxi = { path = "..", features = ["mlua", "test"] }
 
 [build-dependencies]

tests/src/api/global.rs

@@ -1,6 +1,8 @@
+use std::sync::Arc;
+
 use all_asserts::*;
 use nvim_oxi::api::{self, opts::*, types::*, Buffer, Window};
-use nvim_oxi::mlua::{IntoLuaMulti, Lua, Result as LuaResult, Table};
+use nvim_oxi::mlua::{Error as LuaError, IntoLuaMulti, Lua, Table};
 use nvim_oxi::{Dictionary, Object};
 
 #[nvim_oxi::test]
@@ -199,6 +201,21 @@ fn notify_custom() {
     assert_eq!(ret, message.into());
 }
 
+#[nvim_oxi::test]
+fn notify_custom_err() {
+    #[derive(Debug, thiserror::Error)]
+    #[error("")]
+    struct CustomError;
+
+    // Set up a custom notification provider.
+    set_notification_provider(move |_lua, _msg, _level, _opts| {
+        Err::<(), _>(LuaError::ExternalError(Arc::new(CustomError)))
+    });
+
+    let opts = Dictionary::new();
+    let _err = api::notify("", LogLevel::Error, &opts).unwrap_err();
+}
+
 #[nvim_oxi::test]
 fn set_get_del_current_line() {
     let res = api::set_current_line("foo");
@@ -299,7 +316,7 @@ fn hex_to_dec(hex_color: &str) -> u32 {
 
 fn set_notification_provider<P, R>(mut provider: P)
 where
-    P: FnMut(&Lua, String, u32, Table) -> LuaResult<R> + 'static,
+    P: FnMut(&Lua, String, u32, Table) -> Result<R, LuaError> + 'static,
     R: IntoLuaMulti,
 {
     let lua = nvim_oxi::mlua::lua();