For testing an optical network, a transmission module transmits a first optical power level on a first optical port of an optical assembly. The optical assembly includes the first optical port, one or more of an optical cable and an optical waveguide, and a second optical port. The optical assembly is installed in an assembled computer in a state suitable for an end user. A measurement module measures a second optical power level on the second optical port, and a determination module determines a quality level by determining if the second optical power level is below a quality threshold value. The transmission module, the measurement module, and the determination module function within an assembled computer in a state suitable for an end user.