TDD - Open `left` in a browser

Yeah, that would be nice to have. I remember how the screenshot helpers would often come in handy when testing Ruby on Rails apps.

To copy it your clipbaord, you could do something like this:

describe "index" do
  test "lists all posts", %{conn: conn} do
    conn = get(conn, ~p"/posts")

    port = Port.open({:spawn, "pbcopy"}, []) # pbcopy for mac, xsel for linux, etc.
    true = Port.command(port, html_response(conn, 200))
    true = Port.close(port)

    # assert html_response(conn, 200) =~ "Listing Posts"
  end
end

LiveView has open_browser function. You cannot use it directly, because it expects a view or element as an input, not an HTML string, but perhaps you can use it as an inspiration to write your custom browser opening function.

This is also why I’m not exactly a fan of this kind of testing - checking if X is a substring of a very long HTML string. Perhaps it’s better to parse the string with Floki and look for an exact element. Then you would at least know if the problem is that the element does not exist or maybe it exists, but has a different value.