Added fetch_remote_status_service call spec case actibitypub (#6500)

* Added #link_header spec

* Added #call spec

* Delete spec of private methods

* Added call test case activitypub

spec/services/fetch_remote_status_service_spec.rb

 require 'rails_helper'
 
 RSpec.describe FetchRemoteStatusService do
+  let(:account) { Fabricate(:account) }
+  let(:prefetched_body) { nil }
+  let(:valid_domain) { Rails.configuration.x.local_domain }
+
+  let(:note) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: "https://#{valid_domain}/@foo/1234",
+      type: 'Note',
+      content: 'Lorem ipsum',
+      attributedTo: ActivityPub::TagManager.instance.uri_for(account),
+    }
+  end
+
+  context 'protocol is :activitypub' do
+    subject { described_class.new.call(note[:id], prefetched_body, protocol) }
+    let(:prefetched_body) { Oj.dump(note) }
+    let(:protocol) { :activitypub }
+
+    before do
+      account.update(uri: ActivityPub::TagManager.instance.uri_for(account))
+      subject
+    end
+
+    it 'creates status' do
+      status = account.statuses.first
+
+      expect(status).to_not be_nil
+      expect(status.text).to eq 'Lorem ipsum'
+    end
+  end
 end