README.md

WallabyPlugJSDemo

This app was designed to demonstrate how you might be a Wallaby test suite for a JS app that exists outside of the Elixir app, or existing without any Elixir app.

The basics here are we bootstrap a basic Plug web server that will serve your JS app with the Plug.Static module.

defmodule WallabyPlugDemo.Plug do
  use Plug.Router

  plug(Plug.Static, at: "/", from: "javascript-app/dist")

  plug(:match)
  plug(:dispatch)

  match _ do
    send_resp(conn, 404, "Not Found")
  end
end

We show the bare minimum needed to get the test suite to compile your app before your tests. If your app will not live in this repo, you can always just change the path of the Plug.Static config and the compile_assets/1 to point to wherever the project is

In CI, you could have it clone the JS app as well to get it.

defmodule WallabyPlugDemo.MixProject do
  use Mix.Project

  def project do
    [
      app: :wallaby_plug_demo,
      version: "0.1.0",
      elixir: "~> 1.14",
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      aliases: [
        test: ["assets.compile", "test"],
        "assets.compile": &compile_assets/1
      ]
    ]
  end

  defp compile_assets(_) do
    Mix.shell().cmd("yarn build",
      cd: "javascript-app",
      quiet: true
    )
  end

  # ...
end

And we have our feature test!

defmodule ExampleFeatureTest do
  use ExUnit.Case, async: true
  use Wallaby.Feature

  import Wallaby.Query

  feature "counter works", %{session: session} do
    session
    |> visit("/index.html")
    |> assert_text("Vite + Wallaby + React")
    |> assert_text("count is 0")
    |> click(button("counter"))
    |> assert_text("count is 1")
    |> click(button("counter"))
    |> click(button("counter"))
    |> click(button("counter"))
    |> assert_text("count is 4")
  end
end

Voila!