Moves rooms helper method for surface_area to ApplicationHelper

app/helpers/application_helper.rb

@@ -1,4 +1,7 @@
 # frozen_string_literal: true
 
 module ApplicationHelper
+  def surface_area_with_suffix(surface_area)
+    "#{surface_area} #{t("surface_area.unit")}"
+  end
 end

app/helpers/rooms_helper.rb

@@ -35,7 +35,4 @@ def calculated_menu_width(islet)
     frame_width * (((nb_of_frames) / nb_of_lanes) + 1)
   end
 
-  def surface_area_with_suffix(surface_area)
-    "#{surface_area} #{t("surface_area.unit")}"
-  end
 end

spec/helpers/application_helper_spec.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe ApplicationHelper do
+  describe "#surface_area_with_suffix" do
+    it { expect(helper.surface_area_with_suffix(300)).to eq("300 m²") }
+  end
+end

spec/helpers/rooms_helper_spec.rb

@@ -3,7 +3,5 @@
 require "rails_helper"
 
 RSpec.describe RoomsHelper do
-  describe "#surface_area_with_suffix" do
-    it { expect(helper.surface_area_with_suffix(300)).to eq("300 m²") }
   end
 end