What is the best way and/or best software for testing a new installation of dark fiber, not only the physical but also test for L2 errors etc, the fiber connects / terminates at two 6500's and will be configuring a /30 network as to not disrupt anything else in the network, thanks in advance.
From the physical side, it is important to document the fiber you have. Using an optical time domain reflectometer (OTDR) will allow you to capture (document) the fiber link's signature [fiber attenuation, splice/connector loss(es), splice/connector location(s), and fiber length].
Once a link is documented, future troubleshooting is simplified because you know your starting point.
The following Fluke OTDR seems to provide some useful features (optional optical scope) and documentation capabilities.
Hope this helps!