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.
Tell me the slope
All your base are belong to us
Back to basics 15 - Benchmark
Back to basics 20 - singleton dimensions
Sum of first n terms of a harmonic progression
Dancing with wolves?
Check if any duplicates in your data
Given n, create n random numbers such that their standard deviation is also n.
Calories in a slice of pizza?
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