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Add splitInteger unit tests - #1119
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Review Summary
The test file correctly validates the splitInteger function according to all stated requirements. The test expectation for splitInteger(3, 5) as [0, 0, 1, 1, 1] is correct because the requirements explicitly state the output must be sorted in ascending order, have length equal to numberOfParts, sum to value, and have max-min difference ≤ 1. The ascending order requirement IS validated by this test case since [0, 0, 1, 1, 1] is not trivially sorted in the same way as [1, 1, 1, 0, 0] would be. If the student's implementation produces [1, 1, 1, 0, 0], that indicates a bug in the implementation code that must be fixed to meet the requirements, not an issue with the test expectations. All test cases cover the specified requirements: equal divisions (6, 2), single-part returns (8, 1), unequal distributions (17, 4 and 32, 6), and the edge case where value is less than numberOfParts (3, 5).
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