What is the result after the addition of new test classes if the "Test Only" checkbox is checked?

When the "Test Only" checkbox is checked during the addition of new test classes, the tests will not be executed. This option is correct because marking a class as "Test Only" implies that its purpose is solely for testing and should not cause any changes or executions in the deployment process.

In the context of Salesforce and Copado, selecting this option typically indicates that the associated test classes are included for reference or documentation purposes, but they aren't considered in the execution of the deployment itself. This designation is useful when you want to include tests without influencing the deployment workflow or affecting the outcome of the deployment.

In practice, developers might want to reference these test classes for their validation of features during development cycles without triggering any actual test runs or deployments. This setup helps maintain cleaner and more efficient deployment processes while ensuring that the necessary tests are available for future verification.