feat(alchemy_form_for): Allow to disable remote

In order to use `alchemy_form_for` in `turbo_frame_tag`s,
we need to be able to disable the Ajax remote form feature
from `rails-ujs`.

app/helpers/alchemy/admin/form_helper.rb

@@ -16,7 +16,7 @@ module FormHelper
       def alchemy_form_for(object, *args, &block)
         options = args.extract_options!
         options[:builder] = Alchemy::Forms::Builder
-        options[:remote] = request.xhr?
+        options.key?(:remote) || options[:remote] = request.xhr?
         options[:html] = {
           id: options.delete(:id),
           class: ["alchemy", options.delete(:class)].compact.join(" ")

spec/helpers/alchemy/admin/form_helper_spec.rb

@@ -0,0 +1,46 @@
+require "rails_helper"
+
+RSpec.describe Alchemy::Admin::FormHelper do
+  describe "#alchemy_form_for" do
+    subject { helper.alchemy_form_for(resource) {} }
+
+    let(:resource) do
+      [alchemy, :admin, Alchemy::Element.new(name: "article")]
+    end
+
+    it "returns a form with alchemy class" do
+      expect(subject).to have_css(".alchemy")
+    end
+
+    context "if options[:remote] is given" do
+      context "and set to true" do
+        subject { helper.alchemy_form_for(resource, remote: true) {} }
+
+        it "makes the form remote" do
+          expect(subject).to have_css("form[data-remote]")
+        end
+      end
+
+      context "and set to false" do
+        subject { helper.alchemy_form_for(resource, remote: false) {} }
+
+        it "makes the form non-remote" do
+          expect(subject).to have_css("form")
+          expect(subject).to_not have_css("form[data-remote]")
+        end
+      end
+    end
+
+    context "if options[:remote] is not given" do
+      context "and request is xhr" do
+        before do
+          allow(helper).to receive(:request).and_return(double(xhr?: true))
+        end
+
+        it "makes the form remote" do
+          expect(subject).to have_css("form[data-remote]")
+        end
+      end
+    end
+  end
+end