Lists (#5703)

* Add structure for lists

* Add list timeline streaming API

* Add list APIs, bind list-account relation to follow relation

* Add API for adding/removing accounts from lists

* Add pagination to lists API

* Add pagination to list accounts API

* Adjust scopes for new APIs

- Creating and modifying lists merely requires "write" scope
- Fetching information about lists merely requires "read" scope

* Add test for wrong user context on list timeline

* Clean up tests

spec/controllers/api/v1/lists/accounts_controller_spec.rb

@@ -0,0 +1,54 @@
+require 'rails_helper'
+
+describe Api::V1::Lists::AccountsController do
+  render_views
+
+  let(:user)  { Fabricate(:user, account: Fabricate(:account, username: 'alice')) }
+  let(:token) { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: 'read write') }
+  let(:list)  { Fabricate(:list, account: user.account) }
+
+  before do
+    follow = Fabricate(:follow, account: user.account)
+    list.accounts << follow.target_account
+    allow(controller).to receive(:doorkeeper_token) { token }
+  end
+
+  describe 'GET #index' do
+    it 'returns http success' do
+      get :show, params: { list_id: list.id }
+
+      expect(response).to have_http_status(:success)
+    end
+  end
+
+  describe 'POST #create' do
+    let(:bob) { Fabricate(:account, username: 'bob') }
+
+    before do
+      user.account.follow!(bob)
+      post :create, params: { list_id: list.id, account_ids: [bob.id] }
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(:success)
+    end
+
+    it 'adds account to the list' do
+      expect(list.accounts.include?(bob)).to be true
+    end
+  end
+
+  describe 'DELETE #destroy' do
+    before do
+      delete :destroy, params: { list_id: list.id, account_ids: [list.accounts.first.id] }
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(:success)
+    end
+
+    it 'removes account from the list' do
+      expect(list.accounts.count).to eq 0
+    end
+  end
+end