def test_complimentary_sequence_works():
    assert (DNA('GTC').complimentary_sequence == DNA('CAG'))
    assert (DNA('ATC').complimentary_sequence == DNA('TAG'))
    assert (DNA('GTC').complimentary_sequence == DNA('CAG'))
    assert (DNA('ATC').complimentary_sequence == DNA('TAG'))
def test_complimentary_sequence_works():
    assert (DNA('GTC').complimentary_sequence == DNA('CAG'))
    assert (DNA('ATC').complimentary_sequence == DNA('TAG'))
    assert (DNA('GTC').complimentary_sequence == DNA('CAG'))
    assert (DNA('ATC').complimentary_sequence == DNA('TAG'))