neotest-stenciljs

This plugin provides a StencilJS adapter for the Neotest framework.

• neotest-stenciljs
  • Installation
  • Configuration
    • Stricter file parsing to determine test files
    • Filter directories searched for tests
  • Usage
    • Running tests in watch mode
    • Running tests without building
  • Known issues
  • Credits
  • Disclaimer

Installation

Install the adapter using your plugin manager, for example with lazy.nvim:

{
  "nvim-neotest/neotest",
  dependencies = {
    "benelan/neotest-stenciljs",
    -- other plugins required by neotest ...
  },
  config = function()
    require("neotest").setup({
      adapters = {
        require("neotest-stenciljs")
        -- other adapters ...
      },
      -- other neotest config options ...
    })
  end
}

IMPORTANT: Make sure you have the appropriate treesitter language parsers installed, otherwise no tests will be found:

:TSInstall javascript typescript tsx

Configuration

See the source code for the available configuration options:

neotest-stenciljs/lua/neotest-stenciljs/init.lua

Lines 7 to 13 in f98366c

	---@class neotest.StencilOptions
	---@field watch? boolean Run test(s) with the `--watch` flag
	---@field no_build? boolean Run test(s) with the `--no-build` flag
	---@field env? table<string, string>|fun(): table<string, string> Set environment variables
	---@field cwd? string|fun(): string The current working directory for running tests
	---@field filter_dir? fun(name: string, relpath: string, root: string): boolean
	---@field is_test_file? fun(file_path: string): boolean

An example configuration:

require("neotest").setup({
  adapters = {
    require("neotest-stenciljs")({
      no_build = true,
      env = {
        CI = true,
        PUPPETEER_EXECUTABLE_PATH = "/usr/bin/chromium-browser"
      }
      cwd = function(file_path)
        return vim.fs.dirname(file_path)
      end
    }),
  }
})

Stricter file parsing to determine test files

Use the is_test_file option to add a custom criteria for test file discovery. This is helpful in monorepos where other packages use Jest or Vitest, which use similar naming patterns.

---Custom criteria for a file path to determine if it is a stencil test file
---@async
---@param file_path string Path of the potential stencil test file
---@return boolean
is_test_file = function(file_path)
  -- check if the project is "stencil-components" when working in the monorepo
  if
    string.match(file_path, "my-monorepo")
    and not string.match(file_path, "packages/stencil-components")
  then
    return false
  end

  -- this is the default condition
  return string.match(file_path, "%.e2e%.tsx?$")
    or string.match(file_path, "%.spec%.tsx?$")
end,

Filter directories searched for tests

Use the filter_dir option to limit the directories to be searched for tests.

---Filter directories when searching for test files
---@async
---@param name string Name of directory
---@param rel_path string Path to directory, relative to root
---@param root string Root directory of project
---@return boolean
filter_dir = function(name, rel_path, root)
  local full_path = root .. "/" .. rel_path

  if root:match("my-monorepo") then
    return full_path:match("packages/stencil-components/src")
  else
  -- this is the default condition
  return not vim.tbl_contains(
    { "node_modules", "dist", "hydrate", "www", ".stencil", ".storybook" },
    name
  )
  end
end

Usage

See neotest's documentation for information on how to run tests.

Running tests in watch mode

To always run test(s) with the --watchAll flag, you can enable the option during setup:

require('neotest').setup({
  adapters = {
    require('neotest-jest')({ watch = true }),
  }
})

Alternatively, you can add a specific keymap to run test(s) in watch mode:

vim.keymap.set(
  "n",
  "<leader>tw",
  "<CMD>lua require('neotest').run.run({ watch = true })<CR>",
  { noremap = true, desc = "Run test (watch)" }
)

Running tests without building

StencilJS provides the --no-build flag to run e2e tests without building. You can enable the flag during setup:

require('neotest').setup({
  adapters = {
    require('neotest-jest')({ no_build = true }),
  }
})

If you used the watch mode keymap method above, make sure to disable the --no-build flag:

vim.keymap.set(
  "n",
  "<leader>tw",
  "<CMD>lua require('neotest').run.run({ watch = true, no_build = false })<CR>",
  { noremap = true, desc = "Run test (watch)" }
)

Known issues

This adapter currently doesn't work well with Stencil/Jest's it.each syntax, but I hope to fix that in the future. Please log an issue if that's something you want supported.

The adapter also doesn't work well on tests within for/forEach loops. Using the builtin it.each or describe.each syntax should be preferred anyway.

Credits

This neotest adapter was originally copied from neotest-jest and neotest-vitest. StencilJS uses Jest under the hood, so a lot of the code remains unchanged.

Disclaimer

I am not affiliated, associated, authorized, endorsed by, or in any way officially connected with StencilJS and Ionic. Any information or opinions expressed in this project are solely mine and do not necessarily reflect the views or opinions of StencilJS and Ionic.