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test_constants.py has contained only imports since it was created in 2009. It now checks that every constant can be simplified to a finite, non-zero value, that key constants have the expected units, and that physical relations between constants (e.g. hbar = h/2π, R = N_A k, α = e²/4πε₀ħc) hold to within CODATA's rounding. The relations catch constants that are mapped to the wrong CODATA entry, which matters when the data are updated to a new CODATA edition (python-quantities#278).
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test_constants.py has contained only imports since it was created in 2009. It now checks that every constant can be simplified to a finite, non-zero value, that key constants have the expected units, and that physical relations between constants (e.g. hbar = h/2π, R = N_A k, α = e²/4πε₀ħc) hold to within CODATA's rounding. The relations catch constants that are mapped to the wrong CODATA entry, which matters when the data are updated to a new CODATA edition (#278).