A test system can include a test controller, a source system, and a measurement system. The source system can provide a test video clip or test packetized data stream that is injected into a broadcast portion of a service provider's access network at a point similar where other broadcast content would be introduced. The measurement system can be coupled to network equipment downstream or to a capture device, which is coupled to network equipment downstream. Configurations allow for more than one source system, measurement system, or capture system to allow flexibility in implementation for a particular application. The test system can be used to detect a problem or other issue before a customer at a customer premises would experience degradation in quality of experience.