mirror of https://github.com/langgenius/dify.git
79 lines
2.1 KiB
TypeScript
79 lines
2.1 KiB
TypeScript
/**
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* Tests for Array.prototype.toSpliced polyfill
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*/
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describe('toSpliced polyfill', () => {
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let originalToSpliced: typeof Array.prototype.toSpliced
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beforeEach(() => {
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// Save original method
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originalToSpliced = Array.prototype.toSpliced
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})
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afterEach(() => {
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// Restore original method
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// eslint-disable-next-line no-extend-native
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Array.prototype.toSpliced = originalToSpliced
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})
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const applyPolyfill = () => {
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// @ts-expect-error - intentionally deleting for test
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delete Array.prototype.toSpliced
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if (!Array.prototype.toSpliced) {
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// eslint-disable-next-line no-extend-native
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Array.prototype.toSpliced = function <T>(this: T[], start: number, deleteCount?: number, ...items: T[]): T[] {
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const copy = this.slice()
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copy.splice(start, deleteCount ?? copy.length - start, ...items)
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return copy
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}
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}
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}
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it('should add toSpliced method when not available', () => {
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applyPolyfill()
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expect(typeof Array.prototype.toSpliced).toBe('function')
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})
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it('should return a new array without modifying the original', () => {
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applyPolyfill()
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const arr = [1, 2, 3, 4, 5]
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const result = arr.toSpliced(1, 2)
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expect(result).toEqual([1, 4, 5])
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expect(arr).toEqual([1, 2, 3, 4, 5]) // original unchanged
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})
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it('should insert items at the specified position', () => {
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applyPolyfill()
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const arr: (number | string)[] = [1, 2, 3]
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const result = arr.toSpliced(1, 0, 'a', 'b')
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expect(result).toEqual([1, 'a', 'b', 2, 3])
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})
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it('should replace items at the specified position', () => {
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applyPolyfill()
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const arr: (number | string)[] = [1, 2, 3, 4, 5]
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const result = arr.toSpliced(1, 2, 'a', 'b')
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expect(result).toEqual([1, 'a', 'b', 4, 5])
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})
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it('should handle negative start index', () => {
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applyPolyfill()
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const arr = [1, 2, 3, 4, 5]
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const result = arr.toSpliced(-2, 1)
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expect(result).toEqual([1, 2, 3, 5])
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})
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it('should delete to end when deleteCount is omitted', () => {
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applyPolyfill()
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const arr = [1, 2, 3, 4, 5]
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const result = arr.toSpliced(2)
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expect(result).toEqual([1, 2])
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})
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})
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