ricksonoliveira
Use open_browser() in tests when using WSL
Has anyone by any chance using WSL tried to use open_browser in your tests?
I’ve heard one could do something like open_browser(lv, &System.cmd("wslview", [&1])). But I have no idea how to make WSL or Elixir know how to open my default browser.
Has anyone gone through this and have been victorious? ![]()
Thanks!
Marked As Solved
slouchpie
I tried using my answer today and it needed improvement because CSS was not being loaded.
I have a hacky way of making the CSS work (which is better than no way).
First, use this slightly better open_browser_wsl function.
def open_browser_wsl(view) do
Phoenix.LiveViewTest.open_browser(view, fn html_unix_path ->
drive_dir = "/c"
{wsl_path, 0} = System.cmd("wslpath", ["-aw", html_unix_path])
cmd_args = [drive_dir, "start", String.trim_trailing(wsl_path), drive_dir, "zsh"]
opts = [cd: "/mnt" <> drive_dir]
System.cmd("cmd.exe", cmd_args, opts)
end)
end
It is better for 2 reasons:
- It changes directory so there is no more annoying warning about not being a Windows path.
- It makes the drive letter clearly customizable, in case that is necessary.
I usually just slap that function into the block of code in conn_case.ex that starts with:
using do
quote do
With the function inside the using block, any test that has use MyAppWeb.ConnCase will be able to call open_browser_wsl(view).
Now for the CSS. Configure the test Endpoint so that static URLs can be resolved. In config/text.exs, add this:
static_url_path =
try do
{windows_static_path, 0} = System.cmd("wslpath", ["-aw", "priv/static"])
windows_static_path
|> String.trim()
|> String.trim_leading("\\")
|> String.replace("\\", "/")
|> then(&Kernel.<>("file://", &1))
rescue
# revert to default path if command not found, else re-raise the error
e in ErlangError -> if e.original == :enoent, do: "/", else: reraise(e, __STACKTRACE__)
end
and then finally tell the Endpoint (still in the test config file) to use this static path:
config :my_app, RangerWeb.Endpoint,
# ...
static_url: [host: "localhost", path: static_url_path]
The try/rescue block is to make sure people who don’t use WSL can still run tests.
It’s hacky, for sure, but now CSS will be loaded.
@ricksonoliveira Please mark this answer as the solution. It is better than my previous answer.
Also Liked
slouchpie
I had some success with this:
def open_browser_wsl(view) do
Phoenix.LiveViewTest.open_browser(view, fn html_unix_path ->
{wsl_path, 0} = System.cmd("wslpath", ["-aw", html_unix_path])
cmd_args = ["/C", "start", String.trim_trailing(wsl_path), "/C", "bash"]
System.cmd("cmd.exe", cmd_args)
end)
end
chgeuer
Not referring to tests in particular, but on WSL, you can run applications “on the Windows side”, such as cmd.exe. cmd.exe allows you to provide a shell command.
In Bash for example, you can do something like this:
cmd.exe /C "start https://elixirforum.com/"
# or
cmd.exe /C "start $( echo "https://jwt.ms/#access_token=${access_token}" )"
In Elixir, this might be a start:
System.cmd("cmd.exe", ["/C", "start https://elixirforum.com/"])
However, escaping stuff the right way can always be ‘difficult’ (https://flatt.tech/research/posts/batbadbut-you-cant-securely-execute-commands-on-windows/)







