From 3469c58b53d51b6d75c6ef0c3c9531ea76bf8532 Mon Sep 17 00:00:00 2001
From: miteruzo <miteruzo@naver.com>
Date: Sat, 21 Mar 2026 04:57:46 +0900
Subject: [PATCH] #297

---
 backend/spec/factories/theatre_comments.rb    |   8 +
 backend/spec/factories/theatres.rb            |  11 ++
 .../spec/requests/theatre_comments_spec.rb    | 150 ++++++++++++++++++
 3 files changed, 169 insertions(+)
 create mode 100644 backend/spec/factories/theatre_comments.rb
 create mode 100644 backend/spec/factories/theatres.rb
 create mode 100644 backend/spec/requests/theatre_comments_spec.rb

diff --git a/backend/spec/factories/theatre_comments.rb b/backend/spec/factories/theatre_comments.rb
new file mode 100644
index 0000000..a45cec4
--- /dev/null
+++ b/backend/spec/factories/theatre_comments.rb
@@ -0,0 +1,8 @@
+FactoryBot.define do
+  factory :theatre_comment do
+    association :theatre
+    association :user
+    sequence (:no) { |n| n }
+    content { 'test comment' }
+  end
+end
diff --git a/backend/spec/factories/theatres.rb b/backend/spec/factories/theatres.rb
new file mode 100644
index 0000000..47366ea
--- /dev/null
+++ b/backend/spec/factories/theatres.rb
@@ -0,0 +1,11 @@
+FactoryBot.define do
+  factory :theatre do
+    name { 'Test Theatre' }
+    kind { 1 }
+    opens_at { Time.current }
+    closes_at { 1.day.from_now }
+    next_comment_no { 1 }
+
+    association :created_by_user, factory: :user
+  end
+end
diff --git a/backend/spec/requests/theatre_comments_spec.rb b/backend/spec/requests/theatre_comments_spec.rb
new file mode 100644
index 0000000..a9f04a0
--- /dev/null
+++ b/backend/spec/requests/theatre_comments_spec.rb
@@ -0,0 +1,150 @@
+require 'rails_helper'
+
+RSpec.describe 'TheatreComments', type: :request do
+  def sign_in_as(user)
+    allow_any_instance_of(ApplicationController).to receive(:current_user).and_return(user)
+  end
+
+  describe 'GET /theatres/:theatre_id/comments' do
+    let(:theatre) { create(:theatre) }
+    let(:other_theatre) { create(:theatre) }
+    let(:alice) { create(:user, name: 'Alice') }
+    let(:bob) { create(:user, name: 'Bob') }
+
+    let!(:comment_3) do
+      create(
+        :theatre_comment,
+        theatre: theatre,
+        no: 3,
+        user: alice,
+        content: 'third comment'
+      )
+    end
+
+    let!(:comment_1) do
+      create(
+        :theatre_comment,
+        theatre: theatre,
+        no: 1,
+        user: alice,
+        content: 'first comment'
+      )
+    end
+
+    let!(:comment_2) do
+      create(
+        :theatre_comment,
+        theatre: theatre,
+        no: 2,
+        user: bob,
+        content: 'second comment'
+      )
+    end
+
+    let!(:other_comment) do
+      create(
+        :theatre_comment,
+        theatre: other_theatre,
+        no: 1,
+        user: bob,
+        content: 'other theatre comment'
+      )
+    end
+
+    it 'theatre_id で絞り込み、no_gt より大きいものを no 昇順で返す' do
+      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
+
+      expect(response).to have_http_status(:ok)
+      expect(response.parsed_body.map { |row| row['no'] }).to eq([2, 3])
+      expect(response.parsed_body.map { |row| row['content'] }).to eq([
+        'second comment',
+        'third comment'
+      ])
+    end
+
+    it 'user は id と name だけを含む' do
+      get "/theatres/#{theatre.id}/comments", params: { no_gt: 1 }
+
+      expect(response).to have_http_status(:ok)
+
+      expect(response.parsed_body.first['user']).to eq({
+        'id' => bob.id,
+        'name' => 'Bob'
+      })
+      expect(response.parsed_body.first['user'].keys).to contain_exactly('id', 'name')
+    end
+
+    it 'no_gt が負数なら 0 として扱う' do
+      get "/theatres/#{theatre.id}/comments", params: { no_gt: -100 }
+
+      expect(response).to have_http_status(:ok)
+      expect(response.parsed_body.map { |row| row['no'] }).to eq([1, 2, 3])
+    end
+  end
+
+  describe 'POST /theatres/:theatre_id/comments' do
+    let(:user) { create(:user, name: 'Alice') }
+    let(:theatre) { create(:theatre, next_comment_no: 2) }
+
+    before do
+      create(
+        :theatre_comment,
+        theatre: theatre,
+        no: 1,
+        user: user,
+        content: 'existing comment'
+      )
+    end
+
+    it '未ログインなら 401 を返す' do
+      expect {
+        post "/theatres/#{theatre.id}/comments", params: { content: 'hello' }
+      }.not_to change(TheatreComment, :count)
+
+      expect(response).to have_http_status(:unauthorized)
+    end
+
+    it 'content が blank なら 422 を返す' do
+      sign_in_as(user)
+
+      expect {
+        post "/theatres/#{theatre.id}/comments", params: { content: '   ' }
+      }.not_to change(TheatreComment, :count)
+
+      expect(response).to have_http_status(:unprocessable_entity)
+    end
+
+    it 'theatre が存在しなければ 404 を返す' do
+      sign_in_as(user)
+
+      expect {
+        post '/theatres/999999/comments', params: { content: 'hello' }
+      }.not_to change(TheatreComment, :count)
+
+      expect(response).to have_http_status(:not_found)
+    end
+
+    it 'コメントを作成し、user を紐づけ、next_comment_no を進める' do
+      sign_in_as(user)
+
+      expect {
+        post "/theatres/#{theatre.id}/comments", params: { content: 'new comment' }
+      }.to change(TheatreComment, :count).by(1)
+
+      expect(response).to have_http_status(:created)
+
+      comment = TheatreComment.find_by!(theatre: theatre, no: 2)
+
+      expect(comment.user).to eq(user)
+      expect(comment.content).to eq('new comment')
+      expect(theatre.reload.next_comment_no).to eq(3)
+
+      expect(response.parsed_body.slice('theatre_id', 'no', 'user_id', 'content')).to eq({
+        'theatre_id' => theatre.id,
+        'no' => 2,
+        'user_id' => user.id,
+        'content' => 'new comment'
+      })
+    end
+  end
+end