Just because a company provides a solution does not mean that the solution is error-free. An IT staff that uses a cloud-based solution must test the solution and periodically audit key processing to confirm the application is providing correct results. In particular, a cloud-service provider will often perform patch management and version updates. The IT staff should be aware of all such system modifications and test accordingly.
Beyond functionality tests, you should perform load tests that measure your solution’s ability to meet your current and future system demands. By performing such tests, you can identify potential bottlenecks and predict your scalability requirements and future costs.