test: Add Unit Test for LargestPrimeDivisor

[hailduong]

Hello, this PR introduces unit tests for the LargestPrimeDivisor program to ensure its correctness across various input scenarios. The tests verify the program’s behavior for small numbers, prime numbers, composite numbers, and negative numbers.

Changes Made:

• Added JUnit 5 test methods with input/output redirection to simulate user input and capture program output.
• Validated program logic against edge cases, including:
• Small numbers and prime numbers.
• Large composite numbers with multiple prime factors.
• Negative numbers, ensuring absolute values are handled correctly.

Test Scenarios:

Test Name	Input	Expected Output	Description
testSmallNumbers	2\n6\n100\n0\n	-1\n3\n5	Handles small numbers and basic composites.
testPrimeNumber	17\n0\n	-1	Prime number → no largest prime divisor.
testLargeNumber	13195\n0\n	29	Largest prime divisor for composite input.
testNegativeNumbers	-100\n0\n	5	Handles negative input by using absolute value.

Why is this needed?

•	These unit tests ensure the program handles edge cases correctly and adheres to problem requirements.
•	Adds confidence in program behavior for both typical and atypical inputs.

How to Test:

Run the tests using Maven:
mvn clean test

Verify all tests pass successfully.

Notes:

The test suite includes edge cases like prime numbers, negative inputs, and large composite numbers to validate the robustness of the program logic.

[Hoopeu]

邮件已收到，我会尽快回复。

[lingbaoer]

您好，您的邮件我已收到！祝工作顺利，天天开心。。。

[Jiruiyang]

来信收到，谢谢，祝您一切顺利！

[JR00010]

这是来自QQ邮箱的假期自动回复邮件。你好，我最近正在休假中，无法亲自回复你的邮件。我将在假期结束后，尽快给你回复。