Factorial Test Case

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Problem

Commonwealth Fusion Systems software may perform integer calculations related to SPARC operations. Implement a function that calculates the factorial of a non-negative integer, then validate it with representative and boundary-focused test cases.

The factorial of n, written as n!, is the product of every integer from 1 through n. By definition, 0! equals 1.

Formal Specification

Implement factorial(n), where n is an integer from 0 through 12. Return an integer containing n!. Your test coverage must include the smallest valid input, a typical input, and a larger input within the constraints.

Constraints

0 <= n <= 12
n is an integer
Return an integer
Do not use a factorial library function

Function Signature

def factorial(n):

Your solutionPython 3

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