Add Api::ErrorHandling concern for api/base controller (#29574)

spec/controllers/api/base_controller_spec.rb

@@ -3,10 +3,6 @@
 require 'rails_helper'
 
 describe Api::BaseController do
-  before do
-    stub_const('FakeService', Class.new)
-  end
-
   controller do
     def success
       head 200
@@ -72,36 +68,4 @@ describe Api::BaseController do
       expect(response).to have_http_status(403)
     end
   end
-
-  describe 'error handling' do
-    before do
-      routes.draw { get 'failure' => 'api/base#failure' }
-    end
-
-    {
-      ActiveRecord::RecordInvalid => 422,
-      ActiveRecord::RecordNotFound => 404,
-      ActiveRecord::RecordNotUnique => 422,
-      Date::Error => 422,
-      HTTP::Error => 503,
-      Mastodon::InvalidParameterError => 400,
-      Mastodon::NotPermittedError => 403,
-      Mastodon::RaceConditionError => 503,
-      Mastodon::RateLimitExceededError => 429,
-      Mastodon::UnexpectedResponseError => 503,
-      Mastodon::ValidationError => 422,
-      OpenSSL::SSL::SSLError => 503,
-      Seahorse::Client::NetworkingError => 503,
-      Stoplight::Error::RedLight => 503,
-    }.each do |error, code|
-      it "Handles error class of #{error}" do
-        allow(FakeService).to receive(:new).and_raise(error)
-
-        get :failure
-
-        expect(response).to have_http_status(code)
-        expect(FakeService).to have_received(:new)
-      end
-    end
-  end
 end