New API: GET /api/v1/custom_emojis to get a server's custom emojis (#5051)

spec/controllers/api/v1/custom_emojis_controller_spec.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Api::V1::CustomEmojisController, type: :controller do
+  render_views
+
+  describe 'GET #index' do
+    before do
+      Fabricate(:custom_emoji)
+      get :index
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(:success)
+    end
+  end
+end