error checking

gistfile1.txt

glitchmr@strawberry ~/g/p/t1> ./base-test 
1..8
ok 1
ok 2
ok 3
ok 4
ok 5
not ok 6
#   Failed test at ./base-test line 38.
#          got: 'Many solutions:
# A: knight; B: knight
# A: knave; B: knave
# '
#     expected: 'A mentions B but B doesn't say anything.
# '
not ok 7
#   Failed test at ./base-test line 39.
#          got: 'Many solutions:
# A: knight; C: knight
# A: knave; C: knight
# '
#     expected: 'A mentions C but C doesn't say anything.
# '
ok 8
# Looks like you failed 2 tests of 8.