Add ability to follow hashtags (#18809)

spec/controllers/api/v1/followed_tags_controller_spec.rb

@@ -0,0 +1,23 @@
+require 'rails_helper'
+
+RSpec.describe Api::V1::FollowedTagsController, type: :controller do
+  render_views
+
+  let(:user)   { Fabricate(:user) }
+  let(:scopes) { 'read:follows' }
+  let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+
+  before { allow(controller).to receive(:doorkeeper_token) { token } }
+
+  describe 'GET #index' do
+    let!(:tag_follows) { Fabricate.times(5, :tag_follow, account: user.account) }
+
+    before do
+      get :index, params: { limit: 1 }
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(:success)
+    end
+  end
+end

spec/controllers/api/v1/tags_controller_spec.rb

@@ -0,0 +1,82 @@
+require 'rails_helper'
+
+RSpec.describe Api::V1::TagsController, type: :controller do
+  render_views
+
+  let(:user)   { Fabricate(:user) }
+  let(:scopes) { 'write:follows' }
+  let(:token)  { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+
+  before { allow(controller).to receive(:doorkeeper_token) { token } }
+
+  describe 'GET #show' do
+    before do
+      get :show, params: { id: name }
+    end
+
+    context 'with existing tag' do
+      let!(:tag) { Fabricate(:tag) }
+      let(:name) { tag.name }
+
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+    end
+
+    context 'with non-existing tag' do
+      let(:name) { 'hoge' }
+
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+    end
+  end
+
+  describe 'POST #follow' do
+    before do
+      post :follow, params: { id: name }
+    end
+
+    context 'with existing tag' do
+      let!(:tag) { Fabricate(:tag) }
+      let(:name) { tag.name }
+
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+
+      it 'creates follow' do
+        expect(TagFollow.where(tag: tag, account: user.account).exists?).to be true
+      end
+    end
+
+    context 'with non-existing tag' do
+      let(:name) { 'hoge' }
+
+      it 'returns http success' do
+        expect(response).to have_http_status(:success)
+      end
+
+      it 'creates follow' do
+        expect(TagFollow.where(tag: Tag.find_by!(name: name), account: user.account).exists?).to be true
+      end
+    end
+  end
+
+  describe 'POST #unfollow' do
+    let!(:tag) { Fabricate(:tag, name: 'foo') }
+    let!(:tag_follow) { Fabricate(:tag_follow, account: user.account, tag: tag) }
+
+    before do
+      post :unfollow, params: { id: tag.name }
+    end
+
+    it 'returns http success' do
+      expect(response).to have_http_status(:success)
+    end
+
+    it 'removes the follow' do
+      expect(TagFollow.where(tag: tag, account: user.account).exists?).to be false
+    end
+  end
+end