1 files changed, 95 insertions, 0 deletions
diff --git a/tests/run.lua b/tests/run.lua
index 64c12d6..e0c9b0c 100644
--- a/tests/run.lua
+++ b/tests/run.lua
@@ -361,6 +361,101 @@ test("ActionOutcome and DotPayload retain resolved result data", function()
   same("problem", domain.ActionOutcome.error(destination, "problem").diagnostic)
 end)
 
+test("Host adapter owns Nvim timers and event registrations", function()
+  local timer_callbacks = {}
+  local stopped_timers = {}
+  local autocmds = {}
+  local deleted_autocmds = {}
+  local runtime = {
+    api = {
+      nvim_create_augroup = function(name, options)
+        same("clever_f", name)
+        truthy(options.clear)
+        return 7
+      end,
+      nvim_create_autocmd = function(names, options)
+        local id = #autocmds + 20
+        autocmds[#autocmds + 1] = {
+          id = id,
+          names = names,
+          options = options,
+        }
+        return id
+      end,
+      nvim_del_autocmd = function(id)
+        deleted_autocmds[#deleted_autocmds + 1] = id
+      end,
+      nvim_get_current_win = function()
+        return 42
+      end,
+    },
+    fn = {
+      timer_start = function(delay, callback)
+        local id = #timer_callbacks + 1
+        timer_callbacks[id] = { delay = delay, callback = callback }
+        return id
+      end,
+      timer_stop = function(id)
+        stopped_timers[#stopped_timers + 1] = id
+      end,
+    },
+  }
+  local adapter = host_adapter.new({ runtime = runtime })
+  truthy(adapter:supports_timers())
+
+  local fired
+  local first_timer = adapter:start_timer(25, function(identity)
+    fired = identity
+  end)
+  same(25, timer_callbacks[1].delay)
+  timer_callbacks[1].callback(1)
+  same(first_timer, fired)
+  falsy(adapter:stop_timer(first_timer))
+
+  local second_timer = adapter:start_timer(40, function() end)
+  truthy(adapter:stop_timer(second_timer))
+  falsy(adapter:stop_timer(second_timer))
+  list_same({ 2 }, stopped_timers)
+
+  local deliveries = {}
+  local registration = adapter:register_events(
+    { "CursorMoved", "TextChanged" },
+    function(name, payload)
+      deliveries[#deliveries + 1] = {
+        name = name,
+        buffer = payload.buffer,
+        window = payload.window,
+      }
+    end,
+    { buffer = 3 }
+  )
+  list_same({ "CursorMoved", "TextChanged" }, autocmds[1].names)
+  same(3, autocmds[1].options.buffer)
+  same(7, autocmds[1].options.group)
+
+  local transition = adapter:begin_action_transition()
+  autocmds[1].options.callback({
+    event = "CursorMoved",
+    buf = 3,
+    file = "file",
+    match = "file",
+  })
+  same(0, #deliveries)
+  adapter:commit_action_transition(transition)
+  same(1, #deliveries)
+  same("CursorMoved", deliveries[1].name)
+  same(3, deliveries[1].buffer)
+  same(42, deliveries[1].window)
+
+  adapter:deliver_event("TextChanged", { buffer = 3, window = 51 })
+  same(2, #deliveries)
+  same("TextChanged", deliveries[2].name)
+  same(51, deliveries[2].window)
+  truthy(adapter:remove_event_registration(registration))
+  falsy(adapter:remove_event_registration(registration))
+  list_same({ 20 }, deleted_autocmds)
+end)
+
 test("Host adapter materializes window-local highlight resources", function()
   local groups = { Existing = { fg = 7 } }
   local added = {}