def test_block_diag_simple(rgen):
rows = (4, 7)
cols = (3, 6)
summands = [factory._zrandn((rows[i], cols[i]), randstate=rgen)
for i in range(len(rows))]
blockdiag_sum = utils.block_diag(summands)
blockdiag_sum_scipy = block_diag(*summands)
assert_array_almost_equal(blockdiag_sum, blockdiag_sum_scipy)
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