Add FASP follow recommendation support (#34964)

spec/workers/fasp/follow_recommendation_worker_spec.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Fasp::FollowRecommendationWorker, feature: :fasp do
+  include ProviderRequestHelper
+
+  let(:provider) { Fabricate(:follow_recommendation_fasp) }
+  let(:account) { Fabricate(:account) }
+  let(:fetch_service) { instance_double(ActivityPub::FetchRemoteActorService, call: true) }
+
+  let!(:stubbed_request) do
+    account_uri = ActivityPub::TagManager.instance.uri_for(account)
+    path = "/follow_recommendation/v0/accounts?accountUri=#{URI.encode_uri_component(account_uri)}"
+    stub_provider_request(provider,
+                          method: :get,
+                          path:,
+                          response_body: [
+                            'https://fedi.example.com/accounts/1',
+                            'https://fedi.example.com/accounts/7',
+                          ])
+  end
+
+  before do
+    allow(ActivityPub::FetchRemoteActorService).to receive(:new).and_return(fetch_service)
+  end
+
+  it "sends the requesting account's uri to provider and fetches received account uris" do
+    described_class.new.perform(account.id)
+
+    expect(stubbed_request).to have_been_made
+    expect(fetch_service).to have_received(:call).with('https://fedi.example.com/accounts/1')
+    expect(fetch_service).to have_received(:call).with('https://fedi.example.com/accounts/7')
+  end
+
+  it 'marks a running async refresh as finished' do
+    async_refresh = AsyncRefresh.create("fasp:follow_recommendation:#{account.id}", count_results: true)
+
+    described_class.new.perform(account.id)
+
+    expect(async_refresh.reload).to be_finished
+  end
+
+  it 'tracks the number of fetched accounts in the async refresh' do
+    async_refresh = AsyncRefresh.create("fasp:follow_recommendation:#{account.id}", count_results: true)
+
+    described_class.new.perform(account.id)
+
+    expect(async_refresh.reload.result_count).to eq 2
+  end
+end