Testing for a raised RuntimeError

[worldly linden]

Hi All, I'm trying to use assert_raise to try to get a crash due to a thrown exception in handle_event in my LiveView. See VSC snapshot attached.
For some reason that I'd like to figure out, this is not working.

    test "send a boom here", %{conn: conn} do
      assert_raise RuntimeError, fn ->
        raise "boom"
      end
    end

this above works.

So is it because it's not the current process raising but the genserver running the LiveView?
How can I test that then?

[weary thicket]

Because you want to capture raises and there is exit, not raise coming from that call

LiveView lives in separate process, so the raise in the handler will be captured at the process boundary and changed to exit

[worldly linden]

How would you catch the exit then?

[worldly linden]

I tried this and it works but I wonder if there's better

test "send a boom event to the LV", %{conn: conn} do
  {:ok, view, _html} = live(conn, ~p"/users")
  Process.flag(:trap_exit, true)
  spawn_link(fn -> render_click(view, "boom", %{}) end)
  assert_receive {:EXIT, apid, {%RuntimeError{message: "boom"} = err, _stack}}
  dbg({apid, err})
end

[weary thicket]

You do not really need that spawn_link there IIRC

[worldly linden]

If I don't use it the test crashes.