Fix content attachment test

test/dummy/app/models/person.rb

@@ -0,0 +1,7 @@
+class Person < ApplicationRecord
+  include ActionText::Attachable
+
+  def to_trix_content_attachment_partial_path
+    "people/trix_content_attachment"
+  end
+end

test/dummy/app/views/people/_trix_content_attachment.html.erb

@@ -0,0 +1,3 @@
+<span class="mentionable-person" gid="<%= person.to_gid %>">
+  <%= person.name %>
+</span>

test/dummy/db/migrate/20181003185713_create_people.rb

@@ -0,0 +1,9 @@
+class CreatePeople < ActiveRecord::Migration[5.2]
+  def change
+    create_table :people do |t|
+      t.string :name
+
+      t.timestamps
+    end
+  end
+end

test/dummy/db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2018_02_12_164506) do
+ActiveRecord::Schema.define(version: 2018_10_03_185713) do
 
   create_table "action_text_rich_texts", force: :cascade do |t|
     t.string "name", null: false
@@ -49,4 +49,10 @@ ActiveRecord::Schema.define(version: 2018_02_12_164506) do
     t.datetime "updated_at", null: false
   end
 
+  create_table "people", force: :cascade do |t|
+    t.string "name"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
 end

test/unit/attachment_test.rb

@@ -34,6 +34,7 @@ class ActionText::AttachmentTest < ActiveSupport::TestCase
   end
 
   test "converts to TrixAttachment with content" do
+    attachable = Person.create! name: "Javan"
     attachment = attachment_from_html(%Q(<action-text-attachment sgid="#{attachable.attachable_sgid}"></action-text-attachment>))
 
     trix_attachment = attachment.to_trix_attachment