Mirage

Web testing library for Hologram

About

Mirage allows for headless testing of hologram pages and components. Its API is very similar to that of PhoenixTest.

Here is a quick example:

test "it works" do
  MyApp.HomePage
  |> visit(%{my_param: "Some param"})
  |> click_link("Sign-up")
  |> fill_in("Name", with: "Bender Bending Rodríguez")
  |> fill_in("Password", with: "wanna-kill-all-humans?")
  |> click_button("Submit")
  |> assert_page(MyApp.WelcomePage)
  |> assert_has("p", "Welcome, Bender!")
end

You can also test components in isolation:

test "it counts" do
  MyApp.Counter
  |> mount(props: %{count: 0})
  |> click_button("+")
  |> assert_has("span", "1")
end

Mirage tracks the page under test, triggers actions, commands, and follows any navigation or redirects. It also includes everyone's favourite debugging tool: open_browser/1!

Installation

def deps do
  [
    {:mirage, "~> 0.0.1", only: :test, runtime: false},
  ]
end

To use Mirage, just import it into your tests:

defmodule MyApp.MyTest do
  use ExUnit.Case
  import Mirage

  test "it works" do
    MyApp.HomePage
    |> visit()
    # ...
  end
end

Or use a custom case:

defmodule MyApp.FeatureCase do
  use ExUnit.CaseTemplate

  using do
    quote do
      import Mirage
    end
  end
end

defmodule MyApp.MyTest do
  use MyApp.FeatureCase

  # ...
end

I'm Mr. Meeseeks, look at me!

This project contains code adapted from meeseeks specifically for parsing CSS selectors. See lib/mirage/css.ex.

Note on AI use

This library is currently super-alpha. It was made with heavy LLM-assisted as it's something that has been blocking progress on another project of mine. I have not finished the full vetting process yet.