fix: oil buffers remain unmodified after saving changes

tests/test_util.lua

@@ -1,8 +1,15 @@
 require("plenary.async").tests.add_to_env()
+local cache = require("oil.cache")
 local M = {}
 
 M.reset_editor = function()
-  require("oil").setup({})
+  require("oil").setup({
+    columms = {},
+    adapters = {
+      ["oil-test://"] = "test",
+    },
+    silence_disclaimer = true,
+  })
   vim.cmd.tabonly({ mods = { silent = true } })
   for i, winid in ipairs(vim.api.nvim_tabpage_list_wins(0)) do
     if i > 1 then
@@ -13,6 +20,7 @@ M.reset_editor = function()
   for _, bufnr in ipairs(vim.api.nvim_list_bufs()) do
     vim.api.nvim_buf_delete(bufnr, { force = true })
   end
+  cache.clear_everything()
 end
 
 M.wait_for_autocmd = a.wrap(function(autocmd, cb)
@@ -24,4 +32,21 @@ M.wait_for_autocmd = a.wrap(function(autocmd, cb)
   })
 end, 2)
 
+---@param actions string[]
+---@param timestep integer
+M.feedkeys = function(actions, timestep)
+  timestep = timestep or 10
+  a.util.sleep(timestep)
+  for _, action in ipairs(actions) do
+    a.util.sleep(timestep)
+    local escaped = vim.api.nvim_replace_termcodes(action, true, false, true)
+    vim.api.nvim_feedkeys(escaped, "m", true)
+  end
+  a.util.sleep(timestep)
+  -- process pending keys until the queue is empty.
+  -- Note that this will exit insert mode.
+  vim.api.nvim_feedkeys("", "x", true)
+  a.util.sleep(timestep)
+end
+
 return M