test: add unit tests for splitInteger function

[sonik-boom71]

Добавлены unit-тесты для функции splitInteger

Что сделано

• Написаны тесты для функции splitInteger
• Проверены граничные случаи (0, отрицательные числа, большие числа)
• Проверена структура возвращаемого значения (массив чисел)

[mateacademy-ai-mentor]

Review Summary

Your test file is well-structured and thoroughly covers all requirements for the splitInteger function. The tests properly validate array length, sum verification, ascending order, and all edge cases including values less than parts, zeros, and large numbers. All examples from the task description are correctly tested. The implementation demonstrates good testing practices with clear descriptions and appropriate use of Jest matchers. No issues were found that would prevent approval.

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