Fix: support links with only query parameters

[jounimakela]

This commit resolves an issue where links containing only query parameters without a specified path would incorrectly direct to the root path instead of the current path, unlike standard browser behavior.

Example of a link without a path:

<a href="?lang=en">English</a>

Previously, click_link/2 would direct to root path. In this commit the link correctly retains the current page while applying the query parameters.

[germsvel]

@jounimakela thanks for opening this issue.

I think the problem isn't with phoenix_test itself. We're passing the path to Phoenix.ConntTest.get, which seems to treat that as the root path. Would you mind opening an issue in that repo?

I think if we want to fix that here, we should fix it for all links and not just for when we do a click on static pages. That means we should probably clean up the path that is passed to PhoenixTest.visit/2before sending it to Phoenix.ConnTest.get/2.

You can see that here:

phoenix_test/lib/phoenix_test.ex

Lines 214 to 215 in e1a2408

	def visit(conn, path) do
	case get(conn, path) do

I'm open to the idea of us handling it here (in visit/2) and opening an issue in Phoenix.ConnTest (just to let them know. not sure if they'd fix it). Would you be up for that?

[germsvel]

I think this is also related to #72 (though probably need different fixes). Just noting that here.