Tests

Test `gradedrange` constructor with `SectorProduct` passed as `NamedTuple` #19

Job	Run time
Tests (1, macOS-latest) / Julia 1 - macOS-latest	1m 56s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	2m 47s
Tests (1, windows-latest) / Julia 1 - windows-latest	3m 34s
Tests (lts, macOS-latest) / Julia lts - macOS-latest	1m 9s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	1m 34s
Tests (lts, windows-latest) / Julia lts - windows-latest	2m 7s
	13m 7s

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