Unit test and code coverage

created a demo notebook to demonstrate how to calculate LSST bandpass colours #1014

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Run time

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Job	Run time
build (macos-latest, 3.10)	3m 9s
build (macos-latest, 3.11)	4m 7s
build (ubuntu-latest, 3.10)	4m 36s
build (ubuntu-latest, 3.11)	4m 27s
	16m 19s