#399

backend/spec/tasks/nico_sync_spec.rb

@@ -18,7 +18,11 @@ RSpec.describe "nico:sync" do
 
   it "既存 post を見つけて、nico tag と linked tag を追加し、差分が出たら bot を付ける" do
     # 既存 post（正規表現で拾われるURL）
-    post = Post.create!(title: "old", url: "https://www.nicovideo.jp/watch/sm9", uploaded_user: nil)
+    post = Post.create!(
+      title: "old",
+      url: "https://www.nicovideo.jp/watch/sm9",
+      uploaded_user: nil
+    )
 
     # 既存の非nicoタグ（kept_non_nico_ids）
     kept_general = create_tag!("spec_kept", category: "general")
@@ -79,8 +83,35 @@ RSpec.describe "nico:sync" do
     run_rake_task('nico:sync')
   end
 
+  it 'サムネール取得失敗後も次回同期で再試行できる' do
+    post = Post.create!(
+        title: 'old',
+        url: 'https://www.nicovideo.jp/watch/sm9',
+        uploaded_user: nil)
+    Tag.bot
+    Tag.tagme
+
+    stub_python([{ 'code' => 'sm9', 'title' => 't', 'tags' => [] }])
+    allow(URI).to receive(:open)
+        .and_return(
+            StringIO.new(
+                '<meta name="thumbnail" content="https://example.com/thumb.jpg">'))
+    expect(post).to receive(:attach_thumbnail_from_url!)
+        .with('https://example.com/thumb.jpg')
+        .twice
+        .and_raise(Post::RemoteThumbnailFetchFailed, 'failed')
+
+    2.times do
+      run_rake_task('nico:sync')
+    end
+  end
+
   it "既存 post にあった古い nico tag は active から外され、履歴として discard される" do
-    post = Post.create!(title: "old", url: "https://www.nicovideo.jp/watch/sm9", uploaded_user: nil)
+    post = Post.create!(
+      title: "old",
+      url: "https://www.nicovideo.jp/watch/sm9",
+      uploaded_user: nil
+    )
 
     # 旧nicoタグ（今回の同期結果に含まれない）
     old_nico = create_tag!("nico:OLD", category: "nico")