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.
Finding Perfect Squares
Return the first and last characters of a character array
Make a run-length companion vector
Is it an Armstrong number?
Figurate number triangle
Increment a number, given its digits
All your base are belong to us
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