diff --git a/lua/cmdbuf/test/helper.lua b/lua/cmdbuf/test/helper.lua
index 1ff41a1..8124b2a 100644
--- a/lua/cmdbuf/test/helper.lua
+++ b/lua/cmdbuf/test/helper.lua
@@ -2,6 +2,9 @@ local helper = require("vusted.helper")
 local plugin_name = helper.get_module_root(...)
 
 helper.root = helper.find_plugin_root(plugin_name)
+vim.opt.packpath:prepend(vim.fs.joinpath(helper.root, "spec/.shared/packages"))
+require("assertlib").register(require("vusted.assert").register)
+
 helper.cleanup()
 
 function helper.before_each() end
@@ -31,8 +34,4 @@ function helper.search(pattern)
   return result
 end
 
-local asserts = require("vusted.assert").asserts
-local asserters = require(plugin_name .. ".vendor.assertlib").list()
-require(plugin_name .. ".vendor.misclib.test.assert").register(asserts.create, asserters)
-
 return helper
diff --git a/lua/cmdbuf/vendor/assertlib/asserter.lua b/lua/cmdbuf/vendor/assertlib/asserter.lua
deleted file mode 100644
index 49f1e9d..0000000
--- a/lua/cmdbuf/vendor/assertlib/asserter.lua
+++ /dev/null
@@ -1,62 +0,0 @@
-local M = {}
-
-function M.new(name, attributes)
-  vim.validate({
-    name = { name, "string" },
-    attributes = { attributes, "table" },
-  })
-  attributes.get_actual = attributes.get_actual or function() end
-  attributes.get_actual_args = attributes.get_actual_args
-    or function(args)
-      return { unpack(args, 1, #args - 1) }
-    end
-  attributes.get_expected = attributes.get_expected or function(...)
-    return ...
-  end
-  attributes.get_expected_args = attributes.get_expected_args or function(args)
-    return { args[#args] }
-  end
-  return {
-    name = name,
-    get_result = function(args)
-      local expected_args = attributes.get_expected_args(args)
-      local expected = attributes.get_expected(unpack(expected_args))
-      local actual_args = attributes.get_actual_args(args)
-      local actual = attributes.get_actual(unpack(actual_args))
-      return {
-        name = name,
-        expected = expected,
-        expected_args = expected_args,
-        actual = actual,
-        actual_args = actual_args,
-      }
-    end,
-    is_ok = attributes.is_ok or function(result)
-      local expected = vim.inspect(result.expected)
-      local actual = vim.inspect(result.actual)
-      return vim.deep_equal(expected, actual)
-    end,
-    positive_message = attributes.positive_message or function(result)
-      return ("%s should be %s, but actual: %s"):format(result.name, result.expected, result.actual)
-    end,
-    negative_message = attributes.negative_message or function(result)
-      return ("%s should not be %s, but actual: %s"):format(result.name, result.expected, result.actual)
-    end,
-  }
-end
-
-function M.from(module)
-  local asserters = {}
-  for name, fn_or_table in pairs(module) do
-    local atributes
-    if type(fn_or_table) == "function" then
-      atributes = { get_actual = fn_or_table }
-    else
-      atributes = fn_or_table
-    end
-    table.insert(asserters, M.new(name, atributes))
-  end
-  return asserters
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/buffer.lua b/lua/cmdbuf/vendor/assertlib/function/buffer.lua
deleted file mode 100644
index 6c50359..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/buffer.lua
+++ /dev/null
@@ -1,55 +0,0 @@
-local M = {}
-
-function M.current_line()
-  return vim.api.nvim_get_current_line()
-end
-
-function M.filetype()
-  return vim.bo.filetype
-end
-
-function M.buffer_full_name()
-  return vim.api.nvim_buf_get_name(0)
-end
-
-function M.buffer_name_tail()
-  local full_name = vim.api.nvim_buf_get_name(0)
-  return vim.fn.fnamemodify(full_name, ":t")
-end
-
-function M.buffer_number()
-  return vim.api.nvim_get_current_buf()
-end
-
-M.exists_pattern = {
-  get_expected_args = function(args)
-    return args
-  end,
-  get_expected = function(pattern)
-    return pattern:gsub("\n", "\\n")
-  end,
-  is_ok = function(result)
-    local bufnr = result.expected_args[2] or 0
-    return vim.api.nvim_buf_call(bufnr, function()
-      return vim.fn.search(result.expected, "n") ~= 0
-    end)
-  end,
-  positive_message = function(result)
-    local bufnr = result.expected_args[2] or 0
-    local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-    local content = table.concat(lines, "\n")
-    return ([[`%s` not found
-Actual lines:
-%s]]):format(result.expected, content)
-  end,
-  negative_message = function(result)
-    local bufnr = result.expected_args[2] or 0
-    local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
-    local content = table.concat(lines, "\n")
-    return ([[`%s` found
-Actual lines:
-%s]]):format(result.expected, content)
-  end,
-}
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/cursor.lua b/lua/cmdbuf/vendor/assertlib/function/cursor.lua
deleted file mode 100644
index cb92aa1..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/cursor.lua
+++ /dev/null
@@ -1,19 +0,0 @@
-local M = {}
-
-function M.cursor_row()
-  return vim.fn.line(".")
-end
-
-function M.cursor_column()
-  return vim.fn.col(".")
-end
-
-function M.cursor_position()
-  return vim.api.nvim_win_get_cursor(0)
-end
-
-function M.cursor_word()
-  return vim.fn.expand("<cword>")
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/list.lua b/lua/cmdbuf/vendor/assertlib/function/list.lua
deleted file mode 100644
index 9e5fc4b..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/list.lua
+++ /dev/null
@@ -1,7 +0,0 @@
-local M = {}
-
-function M.list_length(list)
-  return #list
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/message.lua b/lua/cmdbuf/vendor/assertlib/function/message.lua
deleted file mode 100644
index 9bbfd6c..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/message.lua
+++ /dev/null
@@ -1,36 +0,0 @@
-local M = {}
-
-local tail_messages = function(messages)
-  local limit = 100
-  local length = #messages
-  local tail = table.concat(vim.list_slice(messages, length - limit, length), "\n")
-  return tail, limit
-end
-
-M.exists_message = {
-  get_actual = function()
-    return vim.split(vim.api.nvim_exec2("messages", { output = true }).output, "\n", { plain = true })
-  end,
-  is_ok = function(result)
-    for _, msg in ipairs(result.actual) do
-      if msg:match(result.expected) then
-        return true
-      end
-    end
-    return false
-  end,
-  positive_message = function(result)
-    local actual, limit = tail_messages(result.actual)
-    return ([[`%s` not found message
-Actual messages tail (max: %d):
-%s]]):format(result.expected, limit, actual)
-  end,
-  negative_message = function(result)
-    local actual, limit = tail_messages(result.actual)
-    return ([[`%s` found message
-Actual messages tail (max: %d):
-%s]]):format(result.expected, limit, actual)
-  end,
-}
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/mode.lua b/lua/cmdbuf/vendor/assertlib/function/mode.lua
deleted file mode 100644
index 662a44a..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/mode.lua
+++ /dev/null
@@ -1,7 +0,0 @@
-local M = {}
-
-function M.mode()
-  return vim.api.nvim_get_mode().mode
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/tab.lua b/lua/cmdbuf/vendor/assertlib/function/tab.lua
deleted file mode 100644
index 7865720..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/tab.lua
+++ /dev/null
@@ -1,11 +0,0 @@
-local M = {}
-
-function M.tab_count()
-  return vim.fn.tabpagenr("$")
-end
-
-function M.tab_number()
-  return vim.fn.tabpagenr()
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/function/window.lua b/lua/cmdbuf/vendor/assertlib/function/window.lua
deleted file mode 100644
index 74a27bc..0000000
--- a/lua/cmdbuf/vendor/assertlib/function/window.lua
+++ /dev/null
@@ -1,11 +0,0 @@
-local M = {}
-
-function M.window_count()
-  return vim.fn.tabpagewinnr(vim.fn.tabpagenr(), "$")
-end
-
-function M.window_id()
-  return vim.api.nvim_get_current_win()
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/assertlib/init.lua b/lua/cmdbuf/vendor/assertlib/init.lua
deleted file mode 100644
index 51764dd..0000000
--- a/lua/cmdbuf/vendor/assertlib/init.lua
+++ /dev/null
@@ -1,34 +0,0 @@
-local M = {}
-
-local dir_parts = vim.split((...):gsub("/", "."), ".", { plain = true })
-function M.list()
-  local base_index = vim.fn.index(dir_parts, "assertlib")
-  local base_parts = vim.list_slice(dir_parts, 1, base_index + 1)
-  local base_path = table.concat(base_parts, "/")
-
-  local function_pattern = ("lua/%s/function/*.lua"):format(base_path)
-  local module_paths = vim.api.nvim_get_runtime_file(function_pattern, true)
-  local module_names = vim.tbl_map(function(path)
-    path = path:gsub("\\", "/")
-    local splitted = vim.split(path, "/", { plain = true })
-    local file_name = splitted[#splitted]
-    local name = file_name:sub(1, #file_name - 4)
-    return name
-  end, module_paths)
-
-  local all = {}
-  local base_module_path = table.concat(base_parts, ".")
-  for _, module_name in ipairs(module_names) do
-    local module = require(base_module_path .. ".function." .. module_name)
-    local asserters = require(base_module_path .. ".asserter").from(module)
-    vim.list_extend(all, asserters)
-  end
-
-  table.sort(all, function(a, b)
-    return a.name > b.name
-  end)
-
-  return all
-end
-
-return M
diff --git a/lua/cmdbuf/vendor/misclib/test/assert.lua b/lua/cmdbuf/vendor/misclib/test/assert.lua
deleted file mode 100644
index 790661b..0000000
--- a/lua/cmdbuf/vendor/misclib/test/assert.lua
+++ /dev/null
@@ -1,16 +0,0 @@
-local M = {}
-
-function M.register(create_assert, asserters)
-  for _, asserter in ipairs(asserters) do
-    create_assert(asserter.name):register(function(self)
-      return function(_, args)
-        local result = asserter.get_result(args)
-        self:set_positive(asserter.positive_message(result))
-        self:set_negative(asserter.negative_message(result))
-        return asserter.is_ok(result)
-      end
-    end)
-  end
-end
-
-return M
diff --git a/spec/lua/cmdbuf/vendorlib.lua b/spec/lua/cmdbuf/vendorlib.lua
index 758785c..c704308 100644
--- a/spec/lua/cmdbuf/vendorlib.lua
+++ b/spec/lua/cmdbuf/vendorlib.lua
@@ -1,15 +1,5 @@
 return {
-  "notomo/assertlib.nvim/lua/assertlib/asserter.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/buffer.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/cursor.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/list.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/message.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/mode.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/tab.lua",
-  "notomo/assertlib.nvim/lua/assertlib/function/window.lua",
-  "notomo/assertlib.nvim/lua/assertlib/init.lua",
   "notomo/misclib.nvim/lua/misclib/cursor.lua",
   "notomo/misclib.nvim/lua/misclib/message.lua",
   "notomo/misclib.nvim/lua/misclib/module.lua",
-  "notomo/misclib.nvim/lua/misclib/test/assert.lua",
 }