Very simple tests to verify that some sample data can be parsed without errors.

The OTDR samples have been copied from the following sources:

https://github.com/sid5432/pyOTDR
* demo_ab.sor
* M200_Sample_005_S13.sor
* sample1310_lowDR.sor 

https://github.com/JamesHarrison/otdrs
* example1-noyes-ofl280-fastreporter-save.sor
* example1-noyes-ofl280.sor
* example2-exfo-maxtester730c.sor
* example3-anritsu-accessmastermt9085.sor
* example4-exfo-ftb4ftbx730c-mfdgainer-1310nm.sor
* example4-exfo-ftb4ftbx730c-mfdgainer-1550nm.sor
* example5-exfo-rtu2ftbx735c-sm7r-ea-hrd.sor

https://github.com/mjuenema/otdrparser/issues/4
* otdr1.sor
* otdr2.sor
* otdr3.sor
* otdr4.sor
* otdr5.sor
* otdr6.sor
* otdr7.sor
