def test_two_letters(transcript):
    res = transcript.utr3_motif_counts("AC")
    assert res == 64
def test_seven_letters(transcript):
    res = transcript.utr3_motif_counts("TGTAAAA")
    assert res == 0
def test_six_letters(transcript):
    res = transcript.utr3_motif_counts("CAGCTG")
    assert res == 2
def test_five_letters(transcript):
    res = transcript.utr3_motif_counts("GAGTT")
    assert res == 2
def test_four_letters(transcript):
    res = transcript.utr3_motif_counts("ACCA")
    assert res == 4
def test_three_letters(transcript):
    res = transcript.utr3_motif_counts("TTT")
    assert res == 14