Added #call spec (#6455)

* Added #link_header spec

* Added #call spec

* Delete spec of private methods

spec/services/fetch_atom_service_spec.rb

 require 'rails_helper'
 
 RSpec.describe FetchAtomService do
-  describe '#link_header' do
-    context 'Link is Array' do
-      target = FetchAtomService.new
-      target.instance_variable_set('@response', 'Link' => [
-        '<http://example.com/>; rel="up"; meta="bar"',
-        '<http://example.com/foo>; rel="self"',
-      ])
+  describe '#call' do
+    let(:url) { 'http://example.com' }
+    subject { FetchAtomService.new.call(url) }
+
+    context 'url is blank' do
+      let(:url) { '' }
+      it { is_expected.to be_nil }
+    end
 
-      it 'set first link as link_header' do
-        expect(target.send(:link_header).links[0].href).to eq 'http://example.com/'
+    context 'request failed' do
+      before do
+        WebMock.stub_request(:get, url).to_return(status: 500, body: '', headers: {})
       end
+
+      it { is_expected.to be_nil }
     end
 
-    context 'Link is not Array' do
-      target = FetchAtomService.new
-      target.instance_variable_set('@response', 'Link' => '<http://example.com/foo>; rel="self", <http://example.com/>; rel = "up"')
+    context 'raise OpenSSL::SSL::SSLError' do
+      before do
+        allow(Request).to receive_message_chain(:new, :add_headers, :perform).and_raise(OpenSSL::SSL::SSLError)
+      end
 
-      it { expect(target.send(:link_header).links[0].href).to eq 'http://example.com/foo' }
+      it 'output log and return nil' do
+        expect_any_instance_of(ActiveSupport::Logger).to receive(:debug).with('SSL error: OpenSSL::SSL::SSLError')
+        is_expected.to be_nil
+      end
     end
-  end
 
-  describe '#perform_request' do
-    let(:url) { 'http://example.com' }
-    context 'Check method result' do
+    context 'raise HTTP::ConnectionError' do
       before do
-        WebMock.stub_request(:get, url).to_return(status: 200, body: '', headers: {})
-        @target = FetchAtomService.new
-        @target.instance_variable_set('@url', url)
+        allow(Request).to receive_message_chain(:new, :add_headers, :perform).and_raise(HTTP::ConnectionError)
       end
 
-      it 'HTTP::Response instance is returned and set to @response' do
-        expect(@target.send(:perform_request).status.to_s).to eq '200 OK'
-        expect(@target.instance_variable_get('@response')).to be_instance_of HTTP::Response
+      it 'output log and return nil' do
+        expect_any_instance_of(ActiveSupport::Logger).to receive(:debug).with('HTTP ConnectionError: HTTP::ConnectionError')
+        is_expected.to be_nil
       end
     end
 
-    context 'check passed parameters to Request' do
+    context 'response success' do
+      let(:body) { '' }
+      let(:headers) { { 'Content-Type' => content_type } }
+      let(:json) {
+        { id: 1,
+          '@context': ActivityPub::TagManager::CONTEXT,
+          type: 'Note',
+        }.to_json
+      }
+
       before do
-        @target = FetchAtomService.new
-        @target.instance_variable_set('@url', url)
-        @target.instance_variable_set('@unsupported_activity', unsupported_activity)
-        allow(Request).to receive(:new).with(:get, url)
-        expect(Request).to receive_message_chain(:new, :add_headers).with('Accept' => accept)
-        allow(Request).to receive_message_chain(:new, :add_headers, :perform).with(no_args)
+        WebMock.stub_request(:get, url).to_return(status: 200, body: body, headers: headers)
       end
 
-      context '@unsupported_activity is true' do
-        let(:unsupported_activity) { true }
-        let(:accept) { 'text/html' }
-        it { @target.send(:perform_request) }
+      context 'content type is application/atom+xml' do
+        let(:content_type) { 'application/atom+xml' }
+
+        it { is_expected.to eq [url, {:prefetched_body=>""}, :ostatus] }
+      end
+
+      context 'content_type is json' do
+        let(:content_type) { 'application/activity+json' }
+        let(:body) { json }
+
+        it { is_expected.to eq [1, { prefetched_body: body, id: true }, :activitypub] }
       end
 
-      context '@unsupported_activity is false' do
-        let(:unsupported_activity) { false }
-        let(:accept) { 'application/activity+json, application/ld+json, application/atom+xml, text/html' }
-        it { @target.send(:perform_request) }
+      before do
+        WebMock.stub_request(:get, url).to_return(status: 200, body: body, headers: headers)
+        WebMock.stub_request(:get, 'http://example.com/foo').to_return(status: 200, body: json, headers: { 'Content-Type' => 'application/activity+json' })
+      end
+
+      context 'has link header' do
+        let(:headers) { { 'Link' => '<http://example.com/foo>; rel="alternate"; type="application/activity+json"', } }
+
+        it { is_expected.to eq [1, { prefetched_body: json, id: true }, :activitypub] }
+      end
+
+      context 'content type is text/html' do
+        let(:content_type) { 'text/html' }
+        let(:body) { '<html><head><link rel="alternate" href="http://example.com/foo" type="application/activity+json"/></head></html>' }
+
+        it { is_expected.to eq [1, { prefetched_body: json, id: true }, :activitypub] }
       end
     end
   end