1 files changed, 34 insertions, 0 deletions
diff --git a/spec/services/todos/destroy/destroyed_issuable_service_spec.rb b/spec/services/todos/destroy/destroyed_issuable_service_spec.rb
new file mode 100644
index 00000000000..24f74bae7c8
--- /dev/null
+++ b/spec/services/todos/destroy/destroyed_issuable_service_spec.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Todos::Destroy::DestroyedIssuableService do
+  describe '#execute' do
+    let_it_be(:target) { create(:merge_request) }
+    let_it_be(:pending_todo) { create(:todo, :pending, project: target.project, target: target, user: create(:user)) }
+    let_it_be(:done_todo) { create(:todo, :done, project: target.project, target: target, user: create(:user)) }
+
+    def execute
+      described_class.new(target.id, target.class.name).execute
+    end
+
+    it 'deletes todos for specified target ID and type' do
+      control_count = ActiveRecord::QueryRecorder.new { execute }.count
+
+      # Create more todos for the target
+      create(:todo, :pending, project: target.project, target: target, user: create(:user))
+      create(:todo, :pending, project: target.project, target: target, user: create(:user))
+      create(:todo, :done, project: target.project, target: target, user: create(:user))
+      create(:todo, :done, project: target.project, target: target, user: create(:user))
+
+      expect { execute }.not_to exceed_query_limit(control_count)
+      expect(target.reload.todos.count).to eq(0)
+    end
+
+    it 'invalidates todos cache counts of todo users', :use_clean_rails_redis_caching do
+      expect { execute }
+        .to change { pending_todo.user.todos_pending_count }.from(1).to(0)
+        .and change { done_todo.user.todos_done_count }.from(1).to(0)
+    end
+  end
+end