Move api/v1/trends/* to request specs (#28949)

spec/requests/api/v1/trends/statuses_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'API V1 Trends Statuses' do
+  describe 'GET /api/v1/trends/statuses' do
+    context 'when trends are disabled' do
+      before { Setting.trends = false }
+
+      it 'returns http success' do
+        get '/api/v1/trends/statuses'
+
+        expect(response).to have_http_status(200)
+      end
+    end
+
+    context 'when trends are enabled' do
+      before { Setting.trends = true }
+
+      it 'returns http success' do
+        prepare_trends
+        stub_const('Api::BaseController::DEFAULT_STATUSES_LIMIT', 2)
+        get '/api/v1/trends/statuses'
+
+        expect(response).to have_http_status(200)
+        expect(response.headers).to include('Link')
+      end
+
+      def prepare_trends
+        Fabricate.times(3, :status, trendable: true, language: 'en').each do |status|
+          2.times { |i| Trends.statuses.add(status, i) }
+        end
+        Trends::Statuses.new(threshold: 1, decay_threshold: -1).refresh
+      end
+    end
+  end
+end