If Debbie sees that Apex tests were run during her deployment, even though she selected No Test Run, what could be the reason?

The reason that Apex tests were run during Debbie's deployment, despite her selection of "No Test Run," can be attributed to the setting in the UAT environment. When the "Run all local tests" checkbox is enabled in the UAT environment, it overrides individual deployment settings regarding test execution. This means that even if a user opts not to run tests during deployment, the environment configuration can still trigger the execution of those tests.

In many deployment processes, especially in environments like UAT, checks and configurations can influence test runs to ensure quality control and adherence to deployment policies. This setting is crucial for maintaining deployment integrity and catching potential issues before changes reach production. Understanding how environment settings can impact deployment behavior is essential for effective management and troubleshooting in deployment processes.