Backport tests

@gsathya, this is a pull request to backport 2 tests from the summer version of Centinel. This has already been code reviewed and it works. Will you review/merge it?
PEP 8 is 2 lines between imports/constants and first function/code and 2 lines between each function. I am ok with 1 line between functions but I would like 2 lines between the imports and the start of code. This is the same structure as every other file I have written for the project.