def test_columnProbs(self):
"""Alignment.columnProbs should find Pr(symbol) in each column"""
#make an alignment with 4 rows (easy to calculate probabilities)
align = Alignment(["AAA", "ACA", "GGG", "GUC"])
cp = align.columnProbs()
#check that the column probs match the counts we expect
self.assertEqual(cp, map(Freqs, [
{'A':0.5, 'G':0.5},
{'A':0.25, 'C':0.25, 'G':0.25, 'U':0.25},
{'A':0.5, 'G':0.25, 'C':0.25},
]))
