fix post factory

spec/factories/posts.rb

@@ -17,6 +17,7 @@
 FactoryGirl.define do
 
   factory :post do
+    association :author, factory: :alice
     title 'sample title'
     body 'sample body'
     specified_date Date.new(2014, 4, 1)

spec/models/notification_spec.rb

@@ -16,7 +16,8 @@ require 'rails_helper'
 
 describe Notification do
   describe 'Instance method' do
-    let(:alice) { create(:alice) }
+    let(:bob) { create(:bob) }
+    let(:post) { create(:post) }
 
     it "notifies on post edited" do
     end

spec/models/post_spec.rb

@@ -20,17 +20,13 @@ describe Post do
   describe 'Instance method' do
     before :each do
       @post = create(:post)
-      @alice = create(:alice)
-      @new_post = @post.generate_fork(@alice)
+      @bob = create(:bob)
+      @new_post = @post.generate_fork(@bob)
       @new_post.save
     end
 
     describe 'Fork' do
 
-      # subject {
-      #   @post.generate_fork(@alice).save
-      # }
-
       it 'duplicated' do
         expect(@new_post.id).not_to eq(@post.id)
       end
@@ -44,7 +40,7 @@ describe Post do
       end
 
       it 'valid user' do
-        expect(@new_post.author).to eq(@alice)
+        expect(@new_post.author).to eq(@bob)
       end
 
       it 'valid user' do