Migrate to request specs in /api/v1/tags (mastodon#25439)

.rubocop_todo.yml

@@ -316,7 +316,6 @@ RSpec/LetSetup:
     - 'spec/controllers/api/v1/admin/accounts_controller_spec.rb'
     - 'spec/controllers/api/v1/filters_controller_spec.rb'
     - 'spec/controllers/api/v1/followed_tags_controller_spec.rb'
-    - 'spec/controllers/api/v1/tags_controller_spec.rb'
     - 'spec/controllers/api/v2/admin/accounts_controller_spec.rb'
     - 'spec/controllers/api/v2/filters/keywords_controller_spec.rb'
     - 'spec/controllers/api/v2/filters/statuses_controller_spec.rb'
@@ -756,7 +755,6 @@ Rails/WhereExists:
     - 'app/workers/move_worker.rb'
     - 'db/migrate/20190529143559_preserve_old_layout_for_existing_users.rb'
     - 'lib/tasks/tests.rake'
-    - 'spec/controllers/api/v1/tags_controller_spec.rb'
     - 'spec/models/account_spec.rb'
     - 'spec/services/activitypub/process_collection_service_spec.rb'
     - 'spec/services/purge_domain_service_spec.rb'

spec/requests/api/v1/tags_spec.rb

@@ -0,0 +1,169 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Tags' do
+  let(:user)    { Fabricate(:user) }
+  let(:scopes)  { 'write:follows' }
+  let(:token)   { Fabricate(:accessible_access_token, resource_owner_id: user.id, scopes: scopes) }
+  let(:headers) { { 'Authorization' => "Bearer #{token.token}" } }
+
+  describe 'GET /api/v1/tags/:id' do
+    subject do
+      get "/api/v1/tags/#{name}"
+    end
+
+    context 'when the tag exists' do
+      let!(:tag) { Fabricate(:tag) }
+      let(:name) { tag.name }
+
+      it 'returns http success' do
+        subject
+
+        expect(response).to have_http_status(200)
+      end
+
+      it 'returns the tag' do
+        subject
+
+        expect(body_as_json[:name]).to eq(name)
+      end
+    end
+
+    context 'when the tag does not exist' do
+      let(:name) { 'hoge' }
+
+      it 'returns http success' do
+        subject
+
+        expect(response).to have_http_status(200)
+      end
+    end
+
+    context 'when the tag name is invalid' do
+      let(:name) { 'tag-name' }
+
+      it 'returns http not found' do
+        subject
+
+        expect(response).to have_http_status(404)
+      end
+    end
+  end
+
+  describe 'POST /api/v1/tags/:id/follow' do
+    subject do
+      post "/api/v1/tags/#{name}/follow", headers: headers
+    end
+
+    let!(:tag) { Fabricate(:tag) }
+    let(:name) { tag.name }
+
+    it_behaves_like 'forbidden for wrong scope', 'read read:follows'
+
+    context 'when the tag exists' do
+      it 'returns http success' do
+        subject
+
+        expect(response).to have_http_status(:success)
+      end
+
+      it 'creates follow' do
+        subject
+
+        expect(TagFollow.where(tag: tag, account: user.account)).to exist
+      end
+    end
+
+    context 'when the tag does not exist' do
+      let(:name) { 'hoge' }
+
+      it 'returns http success' do
+        subject
+
+        expect(response).to have_http_status(200)
+      end
+
+      it 'creates a new tag with the specified name' do
+        subject
+
+        expect(Tag.where(name: name)).to exist
+      end
+
+      it 'creates follow' do
+        subject
+
+        expect(TagFollow.where(tag: Tag.find_by(name: name), account: user.account)).to exist
+      end
+    end
+
+    context 'when the tag name is invalid' do
+      let(:name) { 'tag-name' }
+
+      it 'returns http not found' do
+        subject
+
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    context 'when the Authorization header is missing' do
+      let(:headers) { {} }
+      let(:name)    { 'unauthorized' }
+
+      it 'returns http unauthorized' do
+        subject
+
+        expect(response).to have_http_status(401)
+      end
+    end
+  end
+
+  describe 'POST #unfollow' do
+    subject do
+      post "/api/v1/tags/#{name}/unfollow", headers: headers
+    end
+
+    let(:name) { tag.name }
+    let!(:tag) { Fabricate(:tag, name: 'foo') }
+
+    before do
+      Fabricate(:tag_follow, account: user.account, tag: tag)
+    end
+
+    it_behaves_like 'forbidden for wrong scope', 'read read:follows'
+
+    it 'returns http success' do
+      subject
+
+      expect(response).to have_http_status(200)
+    end
+
+    it 'removes the follow' do
+      subject
+
+      expect(TagFollow.where(tag: tag, account: user.account)).to_not exist
+    end
+
+    context 'when the tag name is invalid' do
+      let(:name) { 'tag-name' }
+
+      it 'returns http not found' do
+        subject
+
+        expect(response).to have_http_status(404)
+      end
+    end
+
+    context 'when the Authorization header is missing' do
+      let(:headers) { {} }
+      let(:name)    { 'unauthorized' }
+
+      it 'returns http unauthorized' do
+        subject
+
+        expect(response).to have_http_status(401)
+      end
+    end
+  end
+end