Add specific rate limits for posting and following (#13172)

spec/controllers/api/v1/statuses_controller_spec.rb

@@ -39,12 +39,50 @@ RSpec.describe Api::V1::StatusesController, type: :controller do
     describe 'POST #create' do
       let(:scopes) { 'write:statuses' }
 
-      before do
-        post :create, params: { status: 'Hello world' }
+      context do
+        before do
+          post :create, params: { status: 'Hello world' }
+        end
+
+        it 'returns http success' do
+          expect(response).to have_http_status(200)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+          expect(response.headers['X-RateLimit-Remaining']).to eq (RateLimiter::FAMILIES[:statuses][:limit] - 1).to_s
+        end
       end
 
-      it 'returns http success' do
-        expect(response).to have_http_status(200)
+      context 'with missing parameters' do
+        before do
+          post :create, params: {}
+        end
+
+        it 'returns http unprocessable entity' do
+          expect(response).to have_http_status(422)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+        end
+      end
+
+      context 'when exceeding rate limit' do
+        before do
+          rate_limiter = RateLimiter.new(user.account, family: :statuses)
+          300.times { rate_limiter.record! }
+          post :create, params: { status: 'Hello world' }
+        end
+
+        it 'returns http too many requests' do
+          expect(response).to have_http_status(429)
+        end
+
+        it 'returns rate limit headers' do
+          expect(response.headers['X-RateLimit-Limit']).to eq RateLimiter::FAMILIES[:statuses][:limit].to_s
+          expect(response.headers['X-RateLimit-Remaining']).to eq '0'
+        end
       end
     end