Do not expect an element to be persisted when building a content

Rails don't need a content, and neiter do we.

app/models/alchemy/content/factory.rb

@@ -26,7 +26,7 @@ def new(attributes = {})
         super(
           name: definition[:name],
           essence_type: normalize_essence_type(definition[:type]),
-          element_id: element.id
+          element: element
         ).tap(&:build_essence)
       end
 

spec/models/alchemy/essence_richtext_spec.rb

@@ -4,7 +4,7 @@
 
 module Alchemy
   describe EssenceRichtext do
-    let(:element) { create(:alchemy_element, name: "article") }
+    let(:element) { Alchemy::Element.new(name: "article") }
     let(:content) { Alchemy::Content.new(name: "text", element: element) }
     let(:essence) do
       Alchemy::EssenceRichtext.new(
@@ -29,7 +29,7 @@ module Alchemy
     end
 
     context "when class is not part of the allowed attributes" do
-      let(:element) { create(:alchemy_element, name: "text") }
+      let(:element) { Alchemy::Element.new(name: "text") }
       let(:content) { Alchemy::Content.new(name: "text", element: element) }
 
       it "should save a sanitized version of body column" do