Refactor StatusReachFinder to be used in more places

spec/services/remove_status_service_spec.rb

@@ -1,7 +1,7 @@
 require 'rails_helper'
 
 RSpec.describe RemoveStatusService, type: :service do
-  subject { RemoveStatusService.new }
+  subject { described_class.new }
 
   let!(:alice)  { Fabricate(:account, user: Fabricate(:user)) }
   let!(:bob)    { Fabricate(:account, username: 'bob', domain: 'example.com') }
@@ -21,14 +21,18 @@ RSpec.describe RemoveStatusService, type: :service do
     Fabricate(:status, account: bill, reblog: @status, uri: 'hoge')
   end
 
+  def home_feed_of(account)
+    HomeFeed.new(account).get(10).map(&:id)
+  end
+
   it 'removes status from author\'s home feed' do
     subject.call(@status)
-    expect(HomeFeed.new(alice).get(10)).to_not include(@status.id)
+    expect(home_feed_of(alice)).to_not include(@status.id)
   end
 
   it 'removes status from local follower\'s home feed' do
     subject.call(@status)
-    expect(HomeFeed.new(jeff).get(10)).to_not include(@status.id)
+    expect(home_feed_of(jeff)).to_not include(@status.id)
   end
 
   it 'sends delete activity to followers' do
@@ -38,7 +42,7 @@ RSpec.describe RemoveStatusService, type: :service do
 
   it 'sends delete activity to rebloggers' do
     subject.call(@status)
-    expect(a_request(:post, 'http://example2.com/inbox')).to have_been_made
+    expect(a_request(:post, 'http://example2.com/inbox')).to have_been_made.once
   end
 
   it 'remove status from notifications' do