Helper #render_menu: Raise on missing partial in dev

When we miss a partial, we want to know (at least in the development and
test environments).

app/helpers/alchemy/pages_helper.rb

@@ -91,11 +91,15 @@ def render_menu(menu_type, options = {})
       end
 
       render("alchemy/menus/#{menu_type}/wrapper", menu: root_node, options: options)
-    rescue ActionView::MissingTemplate => e
-      warning <<~WARN
-        Menu partial not found for #{menu_type}.
-        #{e}
-      WARN
+    rescue ActionView::MissingTemplate => error
+      if Rails.application.config.consider_all_requests_local?
+        raise error
+      else
+        warning <<~WARN
+          Menu partial not found for #{menu_type}.
+          #{error}
+        WARN
+      end
     end
 
     # Returns page links in a breadcrumb beginning from root to current page.

spec/helpers/alchemy/pages_helper_spec.rb

@@ -79,7 +79,17 @@ module Alchemy
         context "but the template does not exist" do
           let(:menu_type) { "unknown" }
 
-          it { is_expected.to be_nil }
+          context "in production environment" do
+            before { allow(Rails.application.config).to receive(:consider_all_requests_local?).and_return(false) }
+
+            it { is_expected.to be_nil }
+          end
+
+          context "in dev or test environment" do
+            before { allow(Rails.application.config).to receive(:consider_all_requests_local?).and_return(true) }
+
+            it { expect { subject }.to raise_error(ActionView::MissingTemplate) }
+          end
         end
       end