62 lines
1.7 KiB
TypeScript
62 lines
1.7 KiB
TypeScript
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import { describe, expect, it } from 'vitest';
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import { uniqueByField } from './unique';
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describe('uniqueByField', () => {
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it('should return an array with unique items based on id field', () => {
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const items = [
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{ id: 1, name: 'Item 1' },
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{ id: 2, name: 'Item 2' },
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{ id: 3, name: 'Item 3' },
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{ id: 1, name: 'Duplicate Item' },
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];
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const uniqueItems = uniqueByField(items, 'id');
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// Assert expected results
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expect(uniqueItems).toHaveLength(3); // After deduplication, there should be three objects left
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expect(uniqueItems).toEqual([
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{ id: 1, name: 'Item 1' },
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{ id: 2, name: 'Item 2' },
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{ id: 3, name: 'Item 3' },
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]);
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});
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it('should return an empty array when input array is empty', () => {
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const items: any[] = []; // Empty array
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const uniqueItems = uniqueByField(items, 'id');
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// Assert expected results
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expect(uniqueItems).toEqual([]);
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});
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it('should handle arrays with only one item correctly', () => {
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const items = [{ id: 1, name: 'Item 1' }];
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const uniqueItems = uniqueByField(items, 'id');
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// Assert expected results
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expect(uniqueItems).toHaveLength(1);
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expect(uniqueItems).toEqual([{ id: 1, name: 'Item 1' }]);
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});
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it('should preserve the order of the first occurrence of each item', () => {
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const items = [
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{ id: 2, name: 'Item 2' },
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{ id: 1, name: 'Item 1' },
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{ id: 3, name: 'Item 3' },
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{ id: 1, name: 'Duplicate Item' },
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];
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const uniqueItems = uniqueByField(items, 'id');
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// Assert expected results (order of first occurrences preserved)
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expect(uniqueItems).toEqual([
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{ id: 2, name: 'Item 2' },
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{ id: 1, name: 'Item 1' },
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{ id: 3, name: 'Item 3' },
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]);
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});
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});
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