err_test.py

import string
import random
import subprocess as sp
import re

def generate_thingy(x, y, z):
    txt = ''.join(random.choice(string.ascii_lowercase) for i in range(x))
    lab = ''.join(random.choice(string.ascii_lowercase) for i in range(y))
    sep = ''.join(random.choice(string.ascii_lowercase + string.punctuation) for i in range(z))
    return bytes("[%s]{.%s}%s _hi_" % (txt, lab,sep), encoding='utf-8')

def get_output(x, y, z):
    txt = generate_thingy(x,y,z)
    pipe = sp.Popen(["pandoc"], stdin=sp.PIPE, stdout=sp.PIPE)
    (stdout, err) = pipe.communicate(txt)
    return (x, y, z, txt, stdout)

def unemphasized(tup):
    (m,n,o,inp,outp) = tup
    return re.match(r'.*<em>hi</em></p>\n$', outp.decode('utf-8')) is None

def rand_test(n):
    for i in range(n):
        x = random.randint(1,30)
        y = random.randint(1,30)
        z = random.randint(0,5)
        out = get_output(x,y,z)
        if unemphasized(out):
            yield out

if __name__ == '__main__':
    tests = 50000
    for tup in rand_test(tests):
        (txt_len, class_len, sep_len, inp, outp) = tup
        inp_str = inp.decode('utf-8')
        if sep_len==0:
            sep = ""
        else:
            sep = inp_str.split('}',1)[1].split()[0]
        print ('%d\t%d\t%d\t%s\t%s' % (txt_len, class_len, sep_len, sep, inp_str))