python - Asserting a function that prints an array -

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i trying test function

def print_board(m):     in range (m.shape[0]):         line=''         j in range (m.shape[1]):            line+=str(int(m[i,j]))         print(line)

i created new file test , imported file , function array not sure on how can test since don't return it, tried :

assert(print_board(array([[1,1,1],[0,0,0],[1,1,1]],dtype='bool')) == '''111 000 111''')

but got

assertionerror

what redirect python standard output (where print sends it) string, , compare string.

see this question explanation of how that.

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