def test_reaction_from_cols(cols, volume, reagents):
rxn = Reaction.from_cols(cols)
assert len(rxn) == len(reagents)
assert rxn.volume == volume
for name, expected in reagents.items():
volume, stock_conc, master_mix = expected
if volume != ...: assert rxn[name].volume == volume
if stock_conc != ...: assert rxn[name].stock_conc == stock_conc
if master_mix != ...: assert rxn[name].master_mix == master_mix
def test_reaction_from_cols_raises(cols, err):
with pytest.raises(UsageError, match=err):
Reaction.from_cols(cols)
