Fix pagination in Api::V1::BlocksController (#5285)

spec/controllers/api/v1/blocks_controller_spec.rb

@@ -6,15 +6,47 @@ RSpec.describe Api::V1::BlocksController, type: :controller do
   let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
   let(:token) { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: 'follow') }
 
-  before do
-    Fabricate(:block, account: user.account)
-    allow(controller).to receive(:doorkeeper_token) { token }
-  end
+  before { allow(controller).to receive(:doorkeeper_token) { token } }
 
   describe 'GET #index' do
-    it 'returns http success' do
+    it 'limits according to limit parameter' do
+      2.times.map { Fabricate(:block, account: user.account) }
       get :index, params: { limit: 1 }
+      expect(body_as_json.size).to eq 1
+    end
 
+    it 'queries blocks in range according to max_id' do
+      blocks = 2.times.map { Fabricate(:block, account: user.account) }
+
+      get :index, params: { max_id: blocks[1] }
+
+      expect(body_as_json.size).to eq 1
+      expect(body_as_json[0][:id]).to eq blocks[0].target_account_id.to_s
+    end
+
+    it 'queries blocks in range according to since_id' do
+      blocks = 2.times.map { Fabricate(:block, account: user.account) }
+
+      get :index, params: { since_id: blocks[0] }
+
+      expect(body_as_json.size).to eq 1
+      expect(body_as_json[0][:id]).to eq blocks[1].target_account_id.to_s
+    end
+
+    it 'sets pagination header for next path' do
+      blocks = 2.times.map { Fabricate(:block, account: user.account) }
+      get :index, params: { limit: 1, since_id: blocks[0] }
+      expect(response.headers['Link'].find_link(['rel', 'next']).href).to eq api_v1_blocks_url(limit: 1, max_id: blocks[1])
+    end
+
+    it 'sets pagination header for previous path' do
+      block = Fabricate(:block, account: user.account)
+      get :index
+      expect(response.headers['Link'].find_link(['rel', 'prev']).href).to eq api_v1_blocks_url(since_id: block)
+    end
+
+    it 'returns http success' do
+      get :index
       expect(response).to have_http_status(:success)
     end
   end