def test_empty_sequence_gives_zero_totals(self):
# arrange the data needed for testing
empty_sequence = ""
# call the count function with the test data
totals = nucleotide.count(empty_sequence)
# expectation is a 0 total for each nucleotide
self.assertTrue([t for t in totals.values() if t != 0] == [],
"Totals should be zero for empty sequence.")
def test_lowercase_sequence_gives_correct_totals(self):
sequence = "acgt" # test all symbols in lowercase
totals = nucleotide.count(sequence)
self.assertTrue([t for t in totals.values() if t != 1] == [],
"Lowercase a,c,g,t should be recognised as valid input.")
