Make your checks robust to brute force approach.
You should add more checks to the test suite.
I agree with Oleg and Gaik: please have a rich test suite.
You should include a test case with a string that contains lowercase letters as well as uppercase letters, numbers, and symbols.
It is not checking lowercase letters. Give some test for that.Otherwise problem statement should be different.
I added a test for lowercase.
the description of the problem is misspecified. "Are all the letters in the input string capital letters?" Numbers are not letters. The tests treat numbers as lower case.
Test cases are not according to problem statement.
Find the longest sequence of 1's in a binary sequence.
Back to basics 17 - white space
Make a run-length companion vector
07 - Common functions and indexing 4
Volume of this donut
Tell me the slope
Distance walked 1D
Dick Van Dyck?
Minimum possible M of the maximum side of a triangle of given area A.
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