I haven’t used a library for this in Elixir, but it’s possible to get similar expressiveness with just functions using tools like Phoenix.LiveViewTest.element

You’d write a helper function like:

def shiny_magic_button(view, name_filter \\ nil) do
  element(view, "button.shiny.magic", name_filter)
end

Then you could write assertions like:

assert view
       |> shiny_magic_button(~r{[wat]+})
       |> render_focus() =~ "Some message"

Alternatively, I’ve also written helpers that took arguments and build a large “selector”, since functions like has_element? expect that.