diff --git a/spec/models/news_spec.rb b/spec/models/news_spec.rb
index 0063aaf4..3beba335 100644
--- a/spec/models/news_spec.rb
+++ b/spec/models/news_spec.rb
@@ -1,5 +1,79 @@
require 'rails_helper'
RSpec.describe News, type: :model do
- pending "add some examples to (or delete) #{__FILE__}"
+ describe 'バリデーション' do
+ let(:news) { build(:news) }
+
+ describe 'title' do
+ it 'タイトルが空の場合は無効になる' do
+ news.title = nil
+ expect(news).not_to be_valid
+ expect(news.errors[:title]).not_to be_empty
+ end
+
+ it 'タイトルが正しく設定されている場合は有効になる' do
+ news.title = '有効なタイトル'
+ expect(news).to be_valid
+ end
+ end
+
+ describe 'url' do
+ context '無効な場合' do
+ it 'URL が空の場合は無効になる' do
+ news.url = nil
+ expect(news).not_to be_valid
+ expect(news.errors[:url]).not_to be_empty
+ end
+
+ it 'URL が重複している場合は無効になる' do
+ create(:news, url: 'https://example.com/test')
+ duplicate_news = build(:news, url: 'https://example.com/test')
+ expect(duplicate_news).not_to be_valid
+ expect(duplicate_news.errors[:url]).not_to be_empty
+ end
+
+ it 'URL形式でない場合は無効になる' do
+ news.url = 'invalid-url'
+ expect(news).not_to be_valid
+ expect(news.errors[:url]).not_to be_empty
+ end
+ end
+
+ context '有効な場合' do
+ it 'HTTPSを許可する' do
+ news.url = 'https://example.com'
+ expect(news).to be_valid
+ end
+
+ it 'HTTPを許可する' do
+ news.url = 'http://example.com'
+ expect(news).to be_valid
+ end
+ end
+ end
+
+ describe 'published_at' do
+ it '公開日時が空の場合は無効になる' do
+ news.published_at = nil
+ expect(news).not_to be_valid
+ expect(news.errors[:published_at]).not_to be_empty
+ end
+
+ it '公開日時が正しく設定されている場合は有効になる' do
+ news.published_at = Time.current
+ expect(news).to be_valid
+ end
+ end
+ end
+
+ describe 'スコープ' do
+ describe '.recent' do
+ it '公開日時の降順で並び替える' do
+ old_news = create(:news, published_at: 2.days.ago)
+ new_news = create(:news, published_at: 1.day.ago)
+
+ expect(News.recent).to eq([new_news, old_news])
+ end
+ end
+ end
end
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