For the specific programming scenario described below, explain what the automated system must do to confirm the function's output is correct and why this step is essential for the verification process.

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Unit test systems are a type of off-the-shelf verifier used in programming to automatically check if a program's output is correct by comparing it against a suite of predefined test cases.

Unit Test Systems as Verifiers

A software developer creates a function to calculate the average of a list of numbers. They write a series of automated checks: one with positive integers `[2, 4, 6]`, one with negative integers `[-1, -2, -3]`, and one with a single number `[5]`. The function passes all these checks, and the developer declares it to be perfectly correct for any list of numbers. Which statement best evaluates the developer's conclusion?

Critique the developer's verification strategy described in the case study. Identify one major strength of this approach and one critical weakness that could lead to errors in a production environment.

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