Explore Your Apex Tests in Visual Studio Code
Where: This feature applies to Lightning Experience, Salesforce Classic, and all versions of the Salesforce app in Enterprise, Performance, Unlimited, Developer, and Database.com editions.
When: We expect to make this functionality available (and to provide documentation) when Salesforce Extensions for VS Code v44 is released on October 13, 2018, or possibly earlier. For updates, keep an eye on the Salesforce Extensions for VS Code change log.
Why: See and run your Apex tests (1), and jump from the test names to the corresponding lines in your code (2).