Add coverage for `Bookmark` validation and reblog/status check callback (#31907)

spec/models/bookmark_spec.rb

@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Bookmark do
+  describe 'Associations' do
+    it { is_expected.to belong_to(:account).required }
+    it { is_expected.to belong_to(:status).required }
+  end
+
+  describe 'Validations' do
+    subject { Fabricate.build :bookmark }
+
+    it { is_expected.to validate_uniqueness_of(:status_id).scoped_to(:account_id) }
+  end
+
+  describe 'Callbacks' do
+    describe 'reblog statuses' do
+      context 'when status is not a reblog' do
+        let(:status) { Fabricate :status }
+
+        it 'keeps status set to assigned value' do
+          bookmark = Fabricate.build :bookmark, status: status
+
+          expect { bookmark.valid? }
+            .to_not change(bookmark, :status)
+        end
+      end
+
+      context 'when status is a reblog' do
+        let(:original) { Fabricate :status }
+        let(:status) { Fabricate :status, reblog: original }
+
+        it 'keeps status set to assigned value' do
+          bookmark = Fabricate.build :bookmark, status: status
+
+          expect { bookmark.valid? }
+            .to change(bookmark, :status).to(original)
+        end
+      end
+    end
+  end
+end