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test(heap): cover heapify up when removing an item #2224

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test(heap): cover heapify up when removing an item #2224

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16 changes: 16 additions & 0 deletions src/data-structures/heap/__test__/MinHeap.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -191,4 +191,20 @@ describe('MinHeap', () => {
minHeap.remove(4);
expect(minHeap.toString()).toBe('1,5,3,8,9,6,7');
});
it('should heapify up when the item moved into the removed position is smaller than its parent', () => {
const minHeap = new MinHeap();

minHeap.add(1);
minHeap.add(5);
minHeap.add(2);
minHeap.add(6);
minHeap.add(7);
minHeap.add(3);
minHeap.add(4);

expect(minHeap.toString()).toBe('1,5,2,6,7,3,4');

minHeap.remove(6);
expect(minHeap.toString()).toBe('1,4,2,5,7,3');
});
});