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import { deepMerge } from '@/utils';
type DeepMergeTestCase<T extends object> = {
source: Required<T>;
target: Required<T>;
expected: T;
};
describe('deepMerge', () => {
describe('primitive values', () => {
type PrimitiveValue = { value: string | number | boolean };
const primitiveTestCases: EachTestingContext<
DeepMergeTestCase<PrimitiveValue>
>[] = [
{
title: 'should override string values',
context: {
source: { value: 'hello' },
target: { value: 'world' },
expected: { value: 'world' },
},
},
{
title: 'should override number values',
context: {
source: { value: 42 },
target: { value: 24 },
expected: { value: 24 },
},
},
{
title: 'should override boolean values',
context: {
source: { value: true },
target: { value: false },
expected: { value: false },
},
},
];
it.each(primitiveTestCases)(
'$title',
({ context: { source, target, expected } }) => {
expect(deepMerge(source, target)).toEqual(expected);
},
);
});
describe('null and undefined handling', () => {
type NullableValue = { value: string | null };
const nullTestCases: EachTestingContext<
DeepMergeTestCase<NullableValue>
>[] = [
{
title: 'should preserve null values from target',
context: {
source: { value: 'hello' },
target: { value: null },
expected: { value: null },
},
},
{
title: 'should ignore undefined values from target',
context: {
source: { value: 'hello' },
target: { value: undefined as unknown as null },
expected: { value: 'hello' },
},
},
{
title: 'should override null values from source',
context: {
source: { value: null },
target: { value: 'world' },
expected: { value: 'world' },
},
},
];
it.each(nullTestCases)(
'$title',
({ context: { source, target, expected } }) => {
expect(deepMerge(source, target)).toEqual(expected);
},
);
type MixedNullValue = { a: number | null; b: number };
const mixedNullTestCase: EachTestingContext<
DeepMergeTestCase<MixedNullValue>
> = {
title: 'should handle mixed null and undefined values',
context: {
source: { a: 1, b: 2 },
target: { a: null, b: 2 },
expected: { a: null, b: 2 },
},
};
it(mixedNullTestCase.title, () => {
const { source, target, expected } = mixedNullTestCase.context;
expect(deepMerge(source, target)).toEqual(expected);
});
});
describe('array handling', () => {
type ArrayValue = { arr: Array<string | number> | null };
const arrayTestCases: EachTestingContext<DeepMergeTestCase<ArrayValue>>[] =
[
{
title: 'should concatenate arrays',
context: {
source: { arr: [1, 2] },
target: { arr: [3, 4] },
expected: { arr: [1, 2, 3, 4] },
},
},
{
title: 'should handle empty target array',
context: {
source: { arr: [1, 2] },
target: { arr: [] },
expected: { arr: [1, 2] },
},
},
{
title: 'should handle empty source array',
context: {
source: { arr: [] },
target: { arr: [1, 2] },
expected: { arr: [1, 2] },
},
},
{
title: 'should handle null target array',
context: {
source: { arr: ['a', 'b'] },
target: { arr: null },
expected: { arr: null },
},
},
];
it.each(arrayTestCases)(
'$title',
({ context: { source, target, expected } }) => {
expect(deepMerge(source, target)).toEqual(expected);
},
);
});
describe('nested objects', () => {
type NestedValue = {
nested: {
a: number;
b: number;
deep?: {
a: number;
b: number;
};
arr: Array<number>;
obj: {
a: number;
b: number;
};
} | null;
};
const nestedTestCases: EachTestingContext<
DeepMergeTestCase<NestedValue>
>[] = [
{
title: 'should merge nested objects',
context: {
source: { nested: { a: 1, b: 2, arr: [], obj: { a: 1, b: 2 } } },
target: { nested: { a: 1, b: 3, arr: [], obj: { a: 1, b: 2 } } },
expected: { nested: { a: 1, b: 3, arr: [], obj: { a: 1, b: 2 } } },
},
},
{
title: 'should merge deeply nested objects',
context: {
source: {
nested: {
a: 1,
b: 2,
deep: { a: 1, b: 2 },
arr: [],
obj: { a: 1, b: 2 },
},
},
target: {
nested: {
a: 1,
b: 2,
deep: { a: 1, b: 3 },
arr: [],
obj: { a: 1, b: 2 },
},
},
expected: {
nested: {
a: 1,
b: 2,
deep: { a: 1, b: 3 },
arr: [],
obj: { a: 1, b: 2 },
},
},
},
},
{
title: 'should handle null nested object in target',
context: {
source: { nested: { a: 1, b: 2, arr: [], obj: { a: 1, b: 2 } } },
target: { nested: null },
expected: { nested: null },
},
},
{
title: 'should handle complex nested structures',
context: {
source: {
nested: {
a: 1,
b: 2,
arr: [1, 2],
obj: { a: 1, b: 2 },
},
},
target: {
nested: {
a: 1,
b: 2,
arr: [3, 4],
obj: { a: 1, b: 3 },
},
},
expected: {
nested: {
a: 1,
b: 2,
arr: [1, 2, 3, 4],
obj: { a: 1, b: 3 },
},
},
},
},
];
it.each(nestedTestCases)(
'$title',
({ context: { source, target, expected } }) => {
expect(deepMerge(source, target)).toEqual(expected);
},
);
});
describe('edge cases', () => {
type EdgeValue = {
a: number | Date | RegExp;
b: number | Date | RegExp;
};
const edgeTestCases: EachTestingContext<DeepMergeTestCase<EdgeValue>>[] = [
{
title: 'should handle Date objects by replacing them',
context: {
source: { a: new Date('2023-01-01'), b: new Date('2023-01-01') },
target: { a: new Date('2023-12-31'), b: new Date('2023-12-31') },
expected: { a: new Date('2023-12-31'), b: new Date('2023-12-31') },
},
},
{
title: 'should handle RegExp objects by replacing them',
context: {
source: { a: /test1/, b: /test1/ },
target: { a: /test2/, b: /test2/ },
expected: { a: /test2/, b: /test2/ },
},
},
{
title: 'should handle mixed Date and RegExp objects',
context: {
source: { a: new Date('2023-01-01'), b: /test1/ },
target: { a: new Date('2023-12-31'), b: /test2/ },
expected: { a: new Date('2023-12-31'), b: /test2/ },
},
},
];
it.each(edgeTestCases)(
'$title',
({ context: { source, target, expected } }) => {
expect(deepMerge(source, target)).toEqual(expected);
},
);
type NestedDateValue = {
a: { value: Date };
b: { value: Date };
};
const nestedDateTestCase: EachTestingContext<
DeepMergeTestCase<NestedDateValue>
> = {
title: 'should handle Date objects in nested structures',
context: {
source: {
a: { value: new Date('2023-01-01') },
b: { value: new Date('2023-01-01') },
},
target: {
a: { value: new Date('2023-12-31') },
b: { value: new Date('2023-12-31') },
},
expected: {
a: { value: new Date('2023-12-31') },
b: { value: new Date('2023-12-31') },
},
},
};
it(nestedDateTestCase.title, () => {
const { source, target, expected } = nestedDateTestCase.context;
expect(deepMerge(source, target)).toEqual(expected);
});
});
});
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