Convert "CSV export" settings controller specs to request specs (#31601)

spec/requests/settings/exports/blocked_domains_spec.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'Settings / Exports / Blocked Domains' do
+  describe 'GET /settings/exports/domain_blocks' do
+    context 'with a signed in user who has blocked domains' do
+      let(:account) { Fabricate :account, domain: 'example.com' }
+      let(:user) { Fabricate :user, account: account }
+
+      before do
+        Fabricate(:account_domain_block, domain: 'example.com', account: account)
+        sign_in user
+      end
+
+      it 'returns a CSV with the domains' do
+        get '/settings/exports/domain_blocks.csv'
+
+        expect(response)
+          .to have_http_status(200)
+        expect(response.content_type)
+          .to eq('text/csv')
+        expect(response.body)
+          .to eq(<<~CSV)
+            example.com
+          CSV
+      end
+    end
+
+    describe 'when signed out' do
+      it 'returns unauthorized' do
+        get '/settings/exports/domain_blocks.csv'
+
+        expect(response)
+          .to have_http_status(401)
+      end
+    end
+  end
+end