Add Current.preview_page?

app/models/alchemy/current.rb

@@ -17,5 +17,9 @@ def preview_page=(page)
       self.language = page&.language
       self.site = page&.site
     end
+
+    def preview_page?(page = Current.page)
+      preview_page == page
+    end
   end
 end

spec/models/alchemy/current_spec.rb

@@ -104,4 +104,28 @@
       end
     end
   end
+
+  describe ".preview_page?" do
+    let(:page) { build(:alchemy_page) }
+
+    context "with page being current preview page" do
+      before do
+        described_class.preview_page = page
+      end
+
+      it "returns true" do
+        expect(described_class.preview_page?(page)).to be_truthy
+      end
+    end
+
+    context "with page being current preview page" do
+      before do
+        described_class.preview_page = nil
+      end
+
+      it "returns true" do
+        expect(described_class.preview_page?(page)).to be_falsey
+      end
+    end
+  end
 end