Use with_request_url in component specs

This method is available since view component 2.31.0, and greatly
simplifies tests depending on the current URL.

spec/components/shared/filter_selector_component_spec.rb

@@ -3,11 +3,10 @@ require "rails_helper"
 describe Shared::FilterSelectorComponent, type: :component do
   it "renders a form with a select" do
     component = Shared::FilterSelectorComponent.new(i18n_namespace: "budgets.investments.index")
-    allow(component).to receive(:url_for).and_return("/")
     allow(component).to receive(:valid_filters).and_return(["unfeasible", "winners"])
     allow(component).to receive(:current_filter).and_return(nil)
 
-    render_inline component
+    with_request_url("/") { render_inline component }
 
     expect(page).to have_select "Filtering projects by"
     expect(page).to have_selector "form[method='get'].filter-selector select"