Volume lifecycle operations need integration tests to validate multi-step workflows: CreateVolume(), AttachVolume(), and DetachVolume(). These are the core of disk migration and involve multiple API calls with state polling.

Can be used HTTP mock servers (similar to tests/integration/test_flavor_info.yml) to simulate realistic multi-step API responses.

What needs to be tested:

• CreateVolume(): basic workflow and error scenarios
• AttachVolume(): attach workflow and error handling
• DetachVolume(): detach workflow and cleanup