Salesforce DX CLI is a tool or mechanism that can be used to verify that the deployment is successful. Salesforce DX CLI is a command-line interface that can be used to create, manage, and deploy Salesforce projects and orgs. Salesforce DX CLI can also be used to run tests, check code coverage, monitor deployment status, and retrieve deployment errors. By using Salesforce DX CLI, the developer can ensure that the application is deployed successfully and meets the quality standards and requirements. Reference: [Salesforce DX CLI], [Deploy and Retrieve Source with Salesforce DX]