feat: 投稿にニコタグ追加できてしまふバグ修正（#125） (#236)

#125

#125

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #236

backend/spec/requests/posts_spec.rb

@@ -167,16 +167,34 @@ RSpec.describe 'Posts API', type: :request do
       expect(json['tags'][0]).to have_key('name')
     end
 
+    context "when nico tag already exists in tags" do
+      before do
+        Tag.find_or_create_by!(tag_name: TagName.find_or_create_by!(name: 'nico:nico_tag'),
+                               category: 'nico')
+      end
+
+      it 'return 400' do
+        sign_in_as(member)
+
+        post '/posts', params: {
+            title: 'new post',
+            url: 'https://example.com/nico_tag',
+            tags: 'nico:nico_tag',
+            thumbnail: dummy_upload }
+
+        expect(response).to have_http_status(:bad_request)
+      end
+    end
+
     context 'when url is blank' do
       it 'returns 422' do
         sign_in_as(member)
 
         post '/posts', params: {
-          title: 'new post',
-          url: '   ',
-          tags: 'spec_tag', # 既存タグ名を投げる
-          thumbnail: dummy_upload
-        }
+            title: 'new post',
+            url: '   ',
+            tags: 'spec_tag', # 既存タグ名を投げる
+            thumbnail: dummy_upload }
 
         expect(response).to have_http_status(:unprocessable_entity)
       end
@@ -233,6 +251,23 @@ RSpec.describe 'Posts API', type: :request do
       names = json['tags'].map { |n| n['name'] }
       expect(names).to include('spec_tag_2')
     end
+
+    context "when nico tag already exists in tags" do
+      before do
+        Tag.find_or_create_by!(tag_name: TagName.find_or_create_by!(name: 'nico:nico_tag'),
+                               category: 'nico')
+      end
+
+      it 'return 400' do
+        sign_in_as(member)
+
+        put "/posts/#{ post_record.id }", params: {
+            title: 'updated title',
+            tags: 'nico:nico_tag' }
+
+        expect(response).to have_http_status(:bad_request)
+      end
+    end
   end
 
   describe 'GET /posts/random' do