diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..f5b9233
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,36 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  appimage-ubuntu:
+    name: Appimage-ubuntu
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - run: date +%F > todays-date
+      - name: Restore cache for today's nightly.
+        uses: actions/cache@v2
+        with:
+          path: |
+            build
+          key: ${{ runner.os }}-appimage-${{ hashFiles('todays-date') }}
+
+      - name: Prepare
+        run: |
+          sudo apt install fd-find
+          test -d build || {
+            mkdir -p build
+            wget https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage
+            chmod +x nvim.appimage
+            mv nvim.appimage ./build/nvim
+          }
+          mkdir -p ~/.local/share/nvim/site/pack/vendor/start
+          git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
+          git clone --depth 1 https://github.com/ray-x/guihua.lua ~/.local/share/nvim/site/pack/vendor/start/guihua.lua
+          git clone --depth 1 https://github.com/kyazdani42/nvim-web-devicons ~/.local/share/nvim/site/pack/vendor/start/nvim-web-devicons
+          ln -s $(pwd) ~/.local/share/nvim/site/pack/vendor/start
+      - name: Run tests
+        run: |
+            export PATH="${PWD}/build/:${PATH}"
+            make test
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..19494a6
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+test:
+	nvim --headless --noplugin -u tests/minimal.vim -c "PlenaryBustedDirectory tests/ {minimal_init = 'tests/minimal.vim'}"
diff --git a/README.md b/README.md
index 2990777..83862be 100644
--- a/README.md
+++ b/README.md
@@ -226,9 +226,10 @@ require'navigator'.setup({
     disable_format_ft = {"sqls", "sumneko_lua", "gopls"},  -- a list of lsp not enable auto-format (e.g. if you using efm or vim-codeformat etc), empty by default
     disable_lsp = {'pylsd', 'sqlls'}, -- a list of lsp server disabled for your project, e.g. denols and tsserver you may
     -- only want to enable one lsp server
-    diag_scroll_bar_sign = {'▃', '█'}, -- experimental:  diagnostic status in scroll bar area; set to nil to disable the diagnostic sign,
+    diagnostic_scroll_bar_sign = {'▃', '█'}, -- experimental:  diagnostic status in scroll bar area; set to nil to disable the diagnostic sign,
     -- for other style, set to {'╍', 'ﮆ'} or {'-', '='}
-
+    diagnostic_virtual_text = true,  -- show virtual for diagnostic message
+    diagnostic_update_in_insert = false, -- update diagnostic message in insert mode
     disply_diagnostic_qf = true, -- always show quickfix if there are diagnostic errors, set to false if you  want to
     ignore it
     tsserver = {
@@ -421,7 +422,7 @@ Jump between symbols with treesitter (with `]r` and `[r`)
 ### Diagnostic
 
 Visual studio code style show errors minimap in scroll bar area
-(Check setup for `diag_scroll_bar_sign`)
+(Check setup for `diagnostic_scrollbar_sign`)
 
 ![diagnostic_scroll_bar](https://user-images.githubusercontent.com/1681295/128736430-e365523d-810c-4c16-a3b4-c74969f45f0b.jpg)
 
diff --git a/lua/navigator.lua b/lua/navigator.lua
index 9eb8904..b21e144 100644
--- a/lua/navigator.lua
+++ b/lua/navigator.lua
@@ -25,7 +25,10 @@ _NgConfigValues = {
     code_lens = false,
     -- only want to enable one lsp server
     disply_diagnostic_qf = true, -- always show quickfix if there are diagnostic errors
-    diag_scroll_bar_sign = {'▃', '█'}, -- set to nil to disable, set to {'╍', 'ﮆ'} to enable diagnostic status in scroll bar area
+
+    diagnostic_virtual_text = true, -- show virtual for diagnostic message
+    diagnostic_update_in_insert = false, -- update diagnostic message in insert mode
+    diagnostic_scrollbar_sign = {'▃', '█'}, -- set to nil to disable, set to {'╍', 'ﮆ'} to enable diagnostic status in scroll bar area
     tsserver = {
       -- filetypes = {'typescript'} -- disable javascript etc,
       -- set to {} to disable the lspclient for all filetype
diff --git a/lua/navigator/codelens.lua b/lua/navigator/codelens.lua
index f73d9d4..a86e006 100644
--- a/lua/navigator/codelens.lua
+++ b/lua/navigator/codelens.lua
@@ -4,6 +4,7 @@
 local codelens = require('vim.lsp.codelens')
 
 local log = require"navigator.util".log
+local trace = require"navigator.util".trace
 
 local lsphelper = require "navigator.lspwrapper"
 local api = vim.api
@@ -42,11 +43,11 @@ local function _update_sign(line)
 end
 
 local function codelens_hdlr(err, _, result, client_id, bufnr)
-  if err then
-    warn("lsp code lens", vim.inspect(err))
+  if err or result == nil then
+    log("lsp code lens", vim.inspect(err))
     return
   end
-  log("codelenes result", result)
+  trace("codelenes result", result)
   for _, v in pairs(result) do
     _update_sign(v.range.start.line)
   end
diff --git a/lua/navigator/diagnostics.lua b/lua/navigator/diagnostics.lua
index 31e3e65..7d28e28 100644
--- a/lua/navigator/diagnostics.lua
+++ b/lua/navigator/diagnostics.lua
@@ -5,6 +5,7 @@ _NG_VT_NS = vim.api.nvim_create_namespace("navigator_lua")
 local util = require "navigator.util"
 local log = util.log
 local trace = require"guihua.log".trace
+-- trace = log
 local error = util.error
 
 local path_sep = require"navigator.util".path_sep()
@@ -12,7 +13,7 @@ local path_cur = require"navigator.util".path_cur()
 diagnostic_list[vim.bo.filetype] = {}
 
 local function error_marker(result, client_id)
-  if _NgConfigValues.lsp.diag_scroll_bar_sign == nil then -- not enabled or already shown
+  if _NgConfigValues.lsp.diagnostic_scrollbar_sign == nil then -- not enabled or already shown
     return
   end
   local first_line = vim.fn.line('w0')
@@ -61,13 +62,13 @@ local function error_marker(result, client_id)
       if pos[#pos] and pos[#pos].line == p then
         pos[#pos] = {
           line = p,
-          sign = _NgConfigValues.lsp.diag_scroll_bar_sign[2],
+          sign = _NgConfigValues.lsp.diagnostic_scrollbar_sign[2],
           severity = diag.severity
         }
       else
         table.insert(pos, {
           line = p,
-          sign = _NgConfigValues.lsp.diag_scroll_bar_sign[1],
+          sign = _NgConfigValues.lsp.diagnostic_scrollbar_sign[1],
           severity = diag.severity
         })
       end
@@ -90,7 +91,7 @@ local function error_marker(result, client_id)
 end
 
 local diag_hdlr = function(err, method, result, client_id, bufnr, config)
-  -- log(result)
+  trace(result)
   if err ~= nil then
     log(err, config)
     return
@@ -151,8 +152,7 @@ local diag_hdlr = function(err, method, result, client_id, bufnr, config)
 end
 
 local M = {}
--- vim.lsp.handlers["textDocument/publishDiagnostics"] =
-M.diagnostic_handler = vim.lsp.with(diag_hdlr, {
+local diagnostic_cfg = {
   -- Enable underline, use default values
   underline = true,
   -- Enable virtual text, override spacing to 0
@@ -161,8 +161,14 @@ M.diagnostic_handler = vim.lsp.with(diag_hdlr, {
   -- and on, using buffer local variables
   signs = true,
   -- Disable a feature
-  update_in_insert = false
-})
+  update_in_insert = _NgConfigValues.lsp.diagnostic_update_in_insert or false
+}
+
+if _NgConfigValues.lsp.diagnostic_virtual_text == false then
+  diagnostic_cfg.virtual_text = false
+end
+-- vim.lsp.handlers["textDocument/publishDiagnostics"] =
+M.diagnostic_handler = vim.lsp.with(diag_hdlr, diagnostic_cfg)
 
 M.show_diagnostic = function()
   vim.lsp.diagnostic.get_all()
@@ -209,7 +215,7 @@ M.set_diag_loclist = function()
   end
 end
 
-function M.clear_blame_VT() -- important for clearing out when no more errors
+local function clear_diag_VT() -- important for clearing out when no more errors
   vim.api.nvim_buf_clear_namespace(0, _NG_VT_NS, 0, -1)
   _NG_VT_NS = nil
 end
@@ -240,11 +246,11 @@ function M.update_err_marker()
 end
 
 -- TODO: update the marker
-if _NgConfigValues.diag_scroll_bar_sign then
-  print("config deprecated, set lsp.diag_scroll_bar_sign instead")
+if _NgConfigValues.diagnostic_scrollbar_sign then
+  print("config deprecated, set lsp.diagnostic_scrollbar_sign instead")
 end
 
-if _NgConfigValues.lsp.diag_scroll_bar_sign then
+if _NgConfigValues.lsp.diagnostic_scrollbar_sign then
   vim.cmd [[autocmd WinScrolled * lua require'navigator.diagnostics'.update_err_marker()]]
 end
 
diff --git a/lua/navigator/reference.lua b/lua/navigator/reference.lua
index 301f3b3..1db227f 100644
--- a/lua/navigator/reference.lua
+++ b/lua/navigator/reference.lua
@@ -38,7 +38,7 @@ local function ref_hdlr(err, api, locations, num, bufnr)
   local wwidth = vim.api.nvim_get_option("columns")
   local mwidth = _NgConfigValues.width
   width = math.min(width + 30, 120, math.floor(wwidth * mwidth))
-  gui.new_list_view({
+  return gui.new_list_view({
     items = items,
     ft = ft,
     width = width,
diff --git a/tests/minimal.vim b/tests/minimal.vim
new file mode 100644
index 0000000..8f7ed71
--- /dev/null
+++ b/tests/minimal.vim
@@ -0,0 +1,24 @@
+set rtp +=.
+set rtp +=../plenary.nvim/
+
+
+runtime! plugin/plenary.vim
+
+
+set noswapfile
+set nobackup
+
+filetype indent off
+set nowritebackup
+set noautoindent
+set nocindent
+set nosmartindent
+set indentexpr=
+
+
+lua << EOF
+_G.test_rename = true
+_G.test_close = true
+require("plenary/busted")
+require("navigator").setup()
+EOF