I was obtaining 34 for 7e4 too, but it's not a problem of the test suite. It just means that your code is not testing all possible combinations (and there are probably other numbers that will fail too). There is no known algorithm to generate the list of integer complexity (https://oeis.org/A005245), which means brute force is the only way to be sure. And brute force finds 32 for 7e4.
It someone doesn't believe 7e4 = (1+1)*(1+1)*(1+1)*(1+1)*(1+ (1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)*(1+1+1)) (32 ones). Or 2^4*(1 + 2*3^7).
Summing Digits within Text
Project Euler: Problem 8, Find largest product in a large string of numbers
Generate N equally spaced intervals between -L and L
MATLAB Basic: rounding III
Sorting integers by their digits (Level 1)
Words Count: A String Array Approach
"Cody" * 5 == "CodyCodyCodyCodyCody"
Cody meets Xiangqi: foresee the unseen (Part 1)
Combine the first and last names
Apply Function to Each Field of a Structure Array: Part 1
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