def METHOD_NAME(self):
    chars = numpy.array(list('ABCDEFGHIJK'))
    ch1 = random_choice(chars, 1_000_000, 0)
    ch2 = random_choice(chars, 2_000_000, 1_000_000)
    ch3 = random_choice(chars, 3_000_000, 3_000_000)
    ch_tot = numpy.concatenate([ch1, ch2, ch3])
    ch6 = random_choice(chars, 6_000_000, 0)
    numpy.testing.assert_equal(ch_tot, ch6)