The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
str = num2str(A,formatSpec), could replace '
Invalid solution, really
New test suite invalidates this solution.
Test for balanced parentheses
Omit columns averages from a matrix
Project Euler: Problem 1, Multiples of 3 and 5
Are you in or are you out?
Is my wife right?
Figurate number triangle
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