diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3aef9cdc..4516645c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,28 +6,31 @@ on:
       - master
 
 jobs:
-  ubuntu:
-    runs-on: ubuntu-latest
+  test:
+    name: Run Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
     steps:
-    - name: Checkout sources
-      uses: actions/checkout@v3
-    - name: Setup build dependencies
-      run: |
-        sudo apt update &&
-        sudo apt install -y ninja-build \
-          gettext \
-          cmake \
-          g++ \
-          unzip
-    - name: Run test with building Nvim
-      run: make test
-  macos:
-    runs-on: macos-latest
-    steps:
-    - name: Checkout sources
-      uses: actions/checkout@v3
-    - name: Setup build dependencies
-      run: brew install ninja
-    - name: Run test with building Nvim
-      run: make test
+      - uses: actions/checkout@v3
+      - uses: rhysd/action-setup-vim@v1
+        id: vim
+        with:
+          neovim: true
+          version: nightly
 
+      - name: luajit
+        uses: leafo/gh-actions-lua@v8
+        with:
+          luaVersion: "luajit-2.1.0-beta3"
+
+      - name: luarocks
+        uses: leafo/gh-actions-luarocks@v4
+
+      - name: run test
+        shell: bash
+        run: |
+          luarocks install luacheck
+          luarocks install vusted
+          vusted ./test
diff --git a/Makefile b/Makefile
index 15aa212c..74715e6b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 test:
-	sh ./scripts/run_test.sh
+	vusted ./test
 
 lint:
 	@printf "\nRunning luacheck\n"
diff --git a/scripts/run_test.sh b/scripts/run_test.sh
deleted file mode 100644
index 7221ef80..00000000
--- a/scripts/run_test.sh
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/bin/sh
-
-PJ_ROOT=$(pwd)
-
-if [ ! -d ./neovim ]; then
-  git clone --depth 1 https://github.com/neovim/neovim
-fi
-
-cd ./neovim
-
-make functionaltest \
-  BUSTED_ARGS="--lpath=$PJ_ROOT/?.lua --lpath=$PJ_ROOT/lua/?.lua --lpath=$PJ_ROOT/lua/lspconfig/?.lua" \
-  TEST_FILE="../test/lspconfig_spec.lua"
diff --git a/selene.toml b/selene.toml
index c85e792c..deeb3976 100644
--- a/selene.toml
+++ b/selene.toml
@@ -3,3 +3,4 @@ std = "neovim"
 [rules]
 global_usage = "allow"
 multiple_statements = "allow"
+incorrect_standard_library_use = "allow"
diff --git a/test/lspconfig_spec.lua b/test/lspconfig_spec.lua
index 1df3464a..aab4f4ba 100644
--- a/test/lspconfig_spec.lua
+++ b/test/lspconfig_spec.lua
@@ -1,362 +1,282 @@
-local helpers = require 'test.functional.helpers'(after_each)
-local clear = helpers.clear
-local exec_lua = helpers.exec_lua
-local eq = helpers.eq
-local ok = helpers.ok
-
-before_each(function()
-  clear()
-  -- add plugin module path to package.path in Lua runtime in Nvim
-  exec_lua(
-    [[
-    package.path = ...
-  ]],
-    package.path
-  )
-end)
+local root = vim.fn.getcwd()
 
 describe('lspconfig', function()
+  local eq = assert.are.equal
+  local same = assert.are.same
+
+  before_each(function()
+    vim.api.nvim_command('cd ' .. root)
+  end)
+
   describe('util', function()
     describe('path', function()
       describe('escape_wildcards', function()
         it('doesnt escape if not needed', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            return lspconfig.util.path.escape_wildcards('/usr/local/test/fname.lua') == '/usr/local/test/fname.lua'
-          ]])
+          local res = lspconfig.util.path.escape_wildcards '/usr/local/test/fname.lua'
+          eq('/usr/local/test/fname.lua', res)
         end)
         it('escapes if needed', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            return lspconfig.util.path.escape_wildcards('/usr/local/test/[sq brackets] fname?*.lua') == '/usr/local/test/\\[sq brackets\\] fname\\?\\*.lua'
-          ]])
+          local res = lspconfig.util.path.escape_wildcards '/usr/local/test/[sq brackets] fname?*.lua'
+          eq('/usr/local/test/\\[sq brackets\\] fname\\?\\*.lua', res)
         end)
       end)
       describe('exists', function()
         it('is present directory', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            local cwd = vim.fn.getcwd()
-            return not (lspconfig.util.path.exists(cwd) == false)
-          ]])
+          local cwd = vim.fn.getcwd()
+          eq(true, lspconfig.util.path.exists(cwd) ~= false)
         end)
 
         it('is not present directory', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-
-            local not_exist_dir = vim.fn.getcwd().."/not/exists"
-            return lspconfig.util.path.exists(not_exist_dir) == false
-          ]])
+          local lspconfig = require 'lspconfig'
+          local not_exist_dir = vim.fn.getcwd() .. '/not/exists'
+          eq(true, lspconfig.util.path.exists(not_exist_dir) == false)
         end)
 
         it('is present file', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-
-            -- change the working directory to test directory
-            vim.api.nvim_command("cd ../test/test_dir/")
-            local file = vim.fn.getcwd().."/root_marker.txt"
-
-            return not (lspconfig.util.path.exists(file) == false)
-          ]])
+          local lspconfig = require 'lspconfig'
+          -- change the working directory to test directory
+          vim.api.nvim_command 'cd ./test/test_dir/'
+          local file = vim.fn.getcwd() .. '/root_marker.txt'
+          eq(true, lspconfig.util.path.exists(file) ~= false)
         end)
 
         it('is not present file', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-
-            -- change the working directory to test directory
-            vim.api.nvim_command("cd ../test/test_dir/")
-            local file = vim.fn.getcwd().."/not_exists.txt"
-
-            return lspconfig.util.path.exists(file) == false
-          ]])
+          local lspconfig = require 'lspconfig'
+          -- change the working directory to test directory
+          vim.api.nvim_command 'cd ./test/test_dir/'
+          local file = vim.fn.getcwd() .. '/not_exists.txt'
+          assert.is_false(lspconfig.util.path.exists(file))
         end)
       end)
 
       describe('is_dir', function()
         it('is directory', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-
-            local cwd = vim.fn.getcwd()
-            return lspconfig.util.path.is_dir(cwd)
-          ]])
+          local lspconfig = require 'lspconfig'
+          local cwd = vim.fn.getcwd()
+          assert.is_true(lspconfig.util.path.is_dir(cwd))
         end)
 
         it('is not present directory', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-
-            local not_exist_dir = vim.fn.getcwd().."/not/exists"
-            return not lspconfig.util.path.is_dir(not_exist_dir)
-          ]])
+          local lspconfig = require 'lspconfig'
+          local not_exist_dir = vim.fn.getcwd() .. '/not/exists'
+          eq(true, not lspconfig.util.path.is_dir(not_exist_dir))
         end)
 
         it('is file', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            -- change the working directory to test directory
-            vim.api.nvim_command("cd ../test/test_dir/")
-            local file = vim.fn.getcwd().."/root_marker.txt"
+          -- change the working directory to test directory
+          vim.api.nvim_command 'cd ./test/test_dir/'
+          local file = vim.fn.getcwd() .. '/root_marker.txt'
 
-            return not lspconfig.util.path.is_dir(file)
-          ]])
+          eq(true, not lspconfig.util.path.is_dir(file))
         end)
       end)
 
       describe('is_file', function()
         it('is file', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            -- change the working directory to test directory
-            vim.api.nvim_command("cd ../test/test_dir/")
-            local file = vim.fn.getcwd().."/root_marker.txt"
+          -- change the working directory to test directory
+          vim.api.nvim_command 'cd ./test/test_dir/'
+          local file = vim.fn.getcwd() .. '/root_marker.txt'
 
-            return lspconfig.util.path.is_file(file)
-          ]])
+          eq(true, lspconfig.util.path.is_file(file))
         end)
 
         it('is not present file', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            -- change the working directory to test directory
-            vim.api.nvim_command("cd ../test/test_dir/")
-            local file = vim.fn.getcwd().."/not_exists.txt"
+          -- change the working directory to test directory
+          vim.api.nvim_command 'cd ./test/test_dir/'
+          local file = vim.fn.getcwd() .. '/not_exists.txt'
 
-            return not lspconfig.util.path.is_file(file)
-          ]])
+          eq(true, not lspconfig.util.path.is_file(file))
         end)
 
         it('is directory', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
+          local lspconfig = require 'lspconfig'
 
-            local cwd = vim.fn.getcwd()
-            return not lspconfig.util.path.is_file(cwd)
-          ]])
+          local cwd = vim.fn.getcwd()
+          eq(true, not lspconfig.util.path.is_file(cwd))
         end)
       end)
 
       describe('is_absolute', function()
         it('is absolute', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-            return not (lspconfig.util.path.is_absolute("/foo/bar") == nil)
-          ]])
+          local lspconfig = require 'lspconfig'
+          eq(true, lspconfig.util.path.is_absolute '/foo/bar' ~= nil)
         end)
 
         it('is not absolute', function()
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-            return lspconfig.util.path.is_absolute("foo/bar") == nil
-          ]])
-
-          ok(exec_lua [[
-            local lspconfig = require("lspconfig")
-            return lspconfig.util.path.is_absolute("../foo/bar") == nil
-          ]])
+          local lspconfig = require 'lspconfig'
+          assert.is_nil(lspconfig.util.path.is_absolute 'foo/bar')
+          assert.is_nil(lspconfig.util.path.is_absolute '../foo/bar')
         end)
       end)
 
       describe('join', function()
         it('', function()
-          eq(
-            exec_lua [[
-            local lspconfig = require("lspconfig")
-            return lspconfig.util.path.join("foo", "bar", "baz")
-          ]],
-            'foo/bar/baz'
-          )
+          local lspconfig = require 'lspconfig'
+          local res = lspconfig.util.path.join('foo', 'bar', 'baz')
+          eq('foo/bar/baz', res)
         end)
       end)
     end)
 
     describe('root_pattern', function()
       it('resolves to a_marker.txt', function()
-        ok(exec_lua [[
-          local lspconfig = require("lspconfig")
-
-          -- change the working directory to test directory
-          vim.api.nvim_command("cd ../test/test_dir/a")
-          local cwd = vim.fn.getcwd()
-          return cwd == lspconfig.util.root_pattern({"root_marker.txt", "a_marker.txt"})(cwd)
-        ]])
+        local lspconfig = require 'lspconfig'
+        -- change the working directory to test directory
+        vim.api.nvim_command 'cd ./test/test_dir/a'
+        local cwd = vim.fn.getcwd()
+        eq(true, cwd == lspconfig.util.root_pattern { 'root_marker.txt', 'a_marker.txt' }(cwd))
       end)
 
       it('resolves to root_marker.txt', function()
-        ok(exec_lua [[
-          local lspconfig = require("lspconfig")
+        local lspconfig = require 'lspconfig'
 
-          -- change the working directory to test directory
-          vim.api.nvim_command("cd ../test/test_dir/a")
+        -- change the working directory to test directory
+        vim.api.nvim_command 'cd ./test/test_dir/a'
 
-          local cwd = vim.fn.getcwd()
-          local resolved = lspconfig.util.root_pattern({"root_marker.txt"})(cwd)
-          vim.api.nvim_command("cd ..")
+        local cwd = vim.fn.getcwd()
+        local resolved = lspconfig.util.root_pattern { 'root_marker.txt' }(cwd)
+        vim.api.nvim_command 'cd ..'
 
-          return vim.fn.getcwd() == resolved
-        ]])
+        eq(true, vim.fn.getcwd() == resolved)
       end)
     end)
 
     describe('strip_archive_subpath', function()
       it('strips zipfile subpaths', function()
-        ok(exec_lua [[
-          local lspconfig = require("lspconfig")
-          return lspconfig.util.strip_archive_subpath("zipfile:///one/two.zip::three/four") == "/one/two.zip"
-        ]])
+        local lspconfig = require 'lspconfig'
+        local res = lspconfig.util.strip_archive_subpath 'zipfile:///one/two.zip::three/four'
+        eq('/one/two.zip', res)
       end)
 
       it('strips tarfile subpaths', function()
-        ok(exec_lua [[
-          local lspconfig = require("lspconfig")
-          return lspconfig.util.strip_archive_subpath("tarfile:/one/two.tgz::three/four") == "/one/two.tgz"
-        ]])
+        local lspconfig = require 'lspconfig'
+        local res = lspconfig.util.strip_archive_subpath 'tarfile:/one/two.tgz::three/four'
+        eq('/one/two.tgz', res)
       end)
 
       it('returns non-archive paths as-is', function()
-        ok(exec_lua [[
-          local lspconfig = require("lspconfig")
-          return lspconfig.util.strip_archive_subpath("/one/two.zip") == "/one/two.zip"
-        ]])
+        local lspconfig = require 'lspconfig'
+        local res = lspconfig.util.strip_archive_subpath '/one/two.zip'
+        eq('/one/two.zip', res)
       end)
     end)
 
     describe('user commands', function()
       it('should translate command definition to nvim_create_user_command options', function()
-        eq(
-          {
-            nargs = '*',
-            complete = 'custom,v:lua.some_global',
-          },
-          exec_lua [[
-            local util = require("lspconfig.util")
-            return util._parse_user_command_options({
-              function () end,
-              "-nargs=* -complete=custom,v:lua.some_global"
-            })
-          ]]
-        )
+        local util = require 'lspconfig.util'
+        local res = util._parse_user_command_options {
+          function() end,
+          '-nargs=* -complete=custom,v:lua.some_global',
+        }
 
-        eq(
-          {
-            desc = 'My awesome description.',
-            nargs = '*',
-            complete = 'custom,v:lua.another_global',
-          },
-          exec_lua [[
-            local util = require("lspconfig.util")
-            return util._parse_user_command_options({
-              function () end,
-              ["-nargs"] = "*",
-              "-complete=custom,v:lua.another_global",
-              description = "My awesome description."
-            })
-          ]]
-        )
+        same({
+          nargs = '*',
+          complete = 'custom,v:lua.some_global',
+        }, res)
+
+        res = util._parse_user_command_options {
+          function() end,
+          ['-nargs'] = '*',
+          '-complete=custom,v:lua.another_global',
+          description = 'My awesome description.',
+        }
+        same({
+          desc = 'My awesome description.',
+          nargs = '*',
+          complete = 'custom,v:lua.another_global',
+        }, res)
       end)
     end)
   end)
 
   describe('config', function()
     it('normalizes user, server, and base default configs', function()
-      eq(
-        exec_lua [[
-        local lspconfig = require("lspconfig")
-        local configs = require("lspconfig.configs")
+      local lspconfig = require 'lspconfig'
+      local configs = require 'lspconfig.configs'
 
-        local actual = nil
-        lspconfig.util.on_setup = function(config)
-          actual = config
-        end
+      local actual = nil
+      lspconfig.util.on_setup = function(config)
+        actual = config
+      end
 
-        lspconfig.util.default_config = {
+      lspconfig.util.default_config = {
+        foo = {
+          bar = {
+            val1 = 'base1',
+            val2 = 'base2',
+          },
+        },
+      }
+
+      local server_config = {
+        default_config = {
           foo = {
             bar = {
-              val1 = 'base1',
-              val2 = 'base2',
-            },
-          },
-        }
-
-        local server_config = {
-          default_config = {
-            foo = {
-              bar = {
-                val2 = 'server2',
-                val3 = 'server3',
-              },
-              baz = 'baz',
-            },
-          },
-        }
-
-        local user_config = {
-          foo = {
-            bar =  {
-              val3 = 'user3',
-              val4 = 'user4',
-            }
-          },
-        }
-
-        configs['test'] = server_config
-        configs['test'].setup(user_config)
-        return actual
-      ]],
-        {
-          foo = {
-            bar = {
-              val1 = 'base1',
               val2 = 'server2',
-              val3 = 'user3',
-              val4 = 'user4',
+              val3 = 'server3',
             },
             baz = 'baz',
           },
-          name = 'test',
-        }
-      )
+        },
+      }
+
+      local user_config = {
+        foo = {
+          bar = {
+            val3 = 'user3',
+            val4 = 'user4',
+          },
+        },
+      }
+
+      configs['test'] = server_config
+      configs['test'].setup(user_config)
+      same({
+        foo = {
+          bar = {
+            val1 = 'base1',
+            val2 = 'server2',
+            val3 = 'user3',
+            val4 = 'user4',
+          },
+          baz = 'baz',
+        },
+        name = 'test',
+      }, actual)
+      configs['test'] = nil
     end)
 
     it("excludes indexed server configs that haven't been set up", function()
-      eq(
-        exec_lua [[
-        local lspconfig = require("lspconfig")
-        local actual = nil
-        local _ = lspconfig.lua_ls
-        local _ = lspconfig.tsserver
-        lspconfig.rust_analyzer.setup {}
-        return require("lspconfig.util").available_servers()
-      ]],
-        { 'rust_analyzer' }
-      )
+      local lspconfig = require 'lspconfig'
+      local _ = lspconfig.lua_ls
+      local _ = lspconfig.tsserver
+      lspconfig.rust_analyzer.setup {}
+      same({ 'rust_analyzer' }, require('lspconfig.util').available_servers())
     end)
 
     it('provides user_config to the on_setup hook', function()
-      eq(
-        exec_lua [[
-        local lspconfig = require "lspconfig"
-        local util = require "lspconfig.util"
-        local user_config
-        util.on_setup = function (_, _user_config)
-          user_config = _user_config
-        end
-        lspconfig.rust_analyzer.setup { custom_user_config = "custom" }
-        return user_config
-      ]],
-        {
-          custom_user_config = 'custom',
-        }
-      )
+      local lspconfig = require 'lspconfig'
+      local util = require 'lspconfig.util'
+      local user_config
+      util.on_setup = function(_, conf)
+        user_config = conf
+      end
+      lspconfig.rust_analyzer.setup { custom_user_config = 'custom' }
+      same({
+        custom_user_config = 'custom',
+      }, user_config)
     end)
   end)
 end)