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test(object/mergeWith): add test cases for replacing non-plain-object with plain object #1500

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Oct 31, 2025
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test(object/mergeWith): add test cases for replacing non-plain-object with plain object #1500

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18 changes: 18 additions & 0 deletions src/object/mergeWith.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -107,4 +107,22 @@ describe('mergeWith', () => {

expect(result).toEqual({ a: 3, b: 2 });
});

it('should replace non-plain-object target value with plain object from source when merge returns undefined', () => {
const target = { a: 'string', b: 123, c: true };
const source = { a: { x: 1 }, b: { y: 2 }, c: { z: 3 } };

const result = mergeWith(target, source, () => undefined);

expect(result).toEqual({ a: { x: 1 }, b: { y: 2 }, c: { z: 3 } });
});

it('should handle nested case where non-plain-object is replaced with plain object when merge returns undefined', () => {
const target = { a: { b: null, c: undefined, d: 'text' } };
const source = { a: { b: { x: 1 }, c: { y: 2 }, d: { z: 3 } } };

const result = mergeWith(target, source, () => undefined);

expect(result).toEqual({ a: { b: { x: 1 }, c: { y: 2 }, d: { z: 3 } } });
});
});