**SystemTestingTools** (for .net core 3.1+) extends your test capabilities, providing ways to create / return stubs, allowing you to run more comprehensive / deterministic / reliable tests in your local dev machine / build tool and in non-prod environments. * supporting interception of Http (HttpClient or WCF) calls: * before they are sent, returning stubs (ideal for automated testing) * after they are sent, where you can save the request and response (recording), log appropriately or replace bad responses by stubs (ideal for dev/test environments that are flaky or not ready) * asserting outgoing calls (ie: making sure out downstream calls have SessionIds) * intercept logs and run asserts on them