Added FetchRemoteAccountService spec (#6456)

* Added #link_header spec

* Added #call spec

* Delete spec of private methods

* Added #call spec

spec/fixtures/requests/webfinger-hacker3.txt

+HTTP/1.1 200 OK
+Server: nginx/1.6.2
+Date: Sun, 20 Mar 2016 11:13:16 GMT
+Content-Type: application/jrd+json
+Transfer-Encoding: chunked
+Connection: keep-alive
+Access-Control-Allow-Origin: *
+Vary: Accept-Encoding,Cookie
+Strict-Transport-Security: max-age=31536000; includeSubdomains;
+
+{"subject":"acct:localhost@kickass.zone","aliases":["https:\/\/kickass.zone\/user\/7477","https:\/\/kickass.zone\/gargron","https:\/\/kickass.zone\/index.php\/user\/7477","https:\/\/kickass.zone\/index.php\/gargron"],"links":[{"rel":"http:\/\/webfinger.net\/rel\/profile-page","type":"text\/html","href":"https:\/\/kickass.zone\/gargron"},{"rel":"http:\/\/gmpg.org\/xfn\/11","type":"text\/html","href":"https:\/\/kickass.zone\/gargron"},{"rel":"describedby","type":"application\/rdf+xml","href":"https:\/\/kickass.zone\/gargron\/foaf"},{"rel":"http:\/\/apinamespace.org\/atom","type":"application\/atomsvc+xml","href":"https:\/\/kickass.zone\/api\/statusnet\/app\/service\/gargron.xml"},{"rel":"http:\/\/apinamespace.org\/twitter","href":"https:\/\/kickass.zone\/api\/"},{"rel":"http:\/\/specs.openid.net\/auth\/2.0\/provider","href":"https:\/\/kickass.zone\/gargron"},{"rel":"http:\/\/schemas.google.com\/g\/2010#updates-from","type":"application\/atom+xml","href":"https:\/\/kickass.zone\/api\/statuses\/user_timeline\/7477.atom"},{"rel":"magic-public-key","href":"data:application\/magic-public-key,RSA.1ZBkHTavLvxH3FzlKv4O6WtlILKRFfNami3_Rcu8EuogtXSYiS-bB6hElZfUCSHbC4uLemOA34PEhz__CDMozax1iI_t8dzjDnh1x0iFSup7pSfW9iXk_WU3Dm74yWWW2jildY41vWgrEstuQ1dJ8vVFfSJ9T_tO4c-T9y8vDI8=.AQAB"},{"rel":"salmon","href":"https:\/\/kickass.zone\/main\/salmon\/user\/7477"},{"rel":"http:\/\/salmon-protocol.org\/ns\/salmon-replies","href":"https:\/\/kickass.zone\/main\/salmon\/user\/7477"},{"rel":"http:\/\/salmon-protocol.org\/ns\/salmon-mention","href":"https:\/\/kickass.zone\/main\/salmon\/user\/7477"},{"rel":"http:\/\/ostatus.org\/schema\/1.0\/subscribe","template":"https:\/\/kickass.zone\/main\/ostatussub?profile={uri}"}]}

spec/services/fetch_remote_account_service_spec.rb

 require 'rails_helper'
 
 RSpec.describe FetchRemoteAccountService do
+  let(:url) { 'https://example.com' }
+  let(:prefetched_body) { nil }
+  let(:protocol) { :ostatus }
+  subject { FetchRemoteAccountService.new.call(url, prefetched_body, protocol) }
+
+  let(:actor) do
+    {
+      '@context': 'https://www.w3.org/ns/activitystreams',
+      id: 'https://example.com/alice',
+      type: 'Person',
+      preferredUsername: 'alice',
+      name: 'Alice',
+      summary: 'Foo bar',
+      inbox: 'http://example.com/alice/inbox',
+    }
+  end
+
+  let(:webfinger) { { subject: 'acct:alice@example.com', links: [{ rel: 'self', href: 'https://example.com/alice' }] } }
+  let(:xml) { File.read(File.join(Rails.root, 'spec', 'fixtures', 'xml', 'mastodon.atom')) }
+
+  shared_examples 'return Account' do
+    it { is_expected.to be_an Account }
+  end
+
+  context 'protocol is :activitypub' do
+    let(:prefetched_body) { Oj.dump(actor) }
+    let(:protocol) { :activitypub }
+
+    before do
+      stub_request(:get, 'https://example.com/.well-known/webfinger?resource=acct:alice@example.com').to_return(body: Oj.dump(webfinger), headers: { 'Content-Type': 'application/jrd+json' })
+    end
+
+    include_examples 'return Account'
+  end
+
+  context 'protocol is :ostatus' do
+    let(:prefetched_body) { xml }
+    let(:protocol) { :ostatus }
+
+    before do
+      stub_request(:get, "https://kickass.zone/.well-known/webfinger?resource=acct:localhost@kickass.zone").to_return(request_fixture('webfinger-hacker3.txt'))
+      stub_request(:get, "https://kickass.zone/api/statuses/user_timeline/7477.atom").to_return(request_fixture('feed.txt'))
+    end
+
+    include_examples 'return Account'
+  end
+
+  context 'when prefetched_body is nil' do
+    context 'protocol is :activitypub' do
+      before do
+        stub_request(:get, url).to_return(status: 200, body: Oj.dump(actor), headers: { 'Content-Type' => 'application/activity+json' })
+        stub_request(:get, 'https://example.com/.well-known/webfinger?resource=acct:alice@example.com').to_return(body: Oj.dump(webfinger), headers: { 'Content-Type': 'application/jrd+json' })
+      end
+
+      include_examples 'return Account'
+    end
+
+    context 'protocol is :ostatus' do
+      before do
+        stub_request(:get, url).to_return(status: 200, body: xml, headers: { 'Content-Type' => 'application/atom+xml' })
+        stub_request(:get, "https://kickass.zone/.well-known/webfinger?resource=acct:localhost@kickass.zone").to_return(request_fixture('webfinger-hacker3.txt'))
+        stub_request(:get, "https://kickass.zone/api/statuses/user_timeline/7477.atom").to_return(request_fixture('feed.txt'))
+      end
+
+      include_examples 'return Account'
+    end
+  end
 end