Final answer:
After running tests, a popup shows the summary which can be reviewed in the sandbox via the Deployment Record, providing results and details of the tests.
Step-by-step explanation:
Once the test run is completed, a popup with the summary will be displayed. You can go back to the sandbox and review the execution details at any time by clicking on Deployment Record. Here, you can find a summary of the tests that were run, as well as detailed information on whether the class, trigger, and methods have passed. This process is indicative of a development environment where software testing is conducted to ensure code quality and functionality before deployment.