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feat(components): set up react testing
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| const baseConfig = require('../../jest.config.base'); | ||
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| module.exports = { | ||
| ...baseConfig, | ||
| setupFilesAfterEnv: ['<rootDir>/jest.setup.js'], | ||
| testEnvironment: 'jsdom', | ||
| }; |
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| import '@testing-library/jest-dom'; |
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packages/components/src/components/VirtualizedList/__tests__/VirtualizedList.test.tsx
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| import React from 'react'; | ||
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| import { render, screen } from '@testing-library/react'; | ||
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| import { VirtualizedList } from '../VirtualizedList'; | ||
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| describe('VirtualizedList', () => { | ||
| describe('type tests', () => { | ||
| it('should throw type errors because local mock items lack the "height" property', () => { | ||
| type MockItem = { id: number; content: string }; | ||
| const mockItems: MockItem[] = Array.from({ length: 100 }, (_, i) => ({ | ||
| id: i, | ||
| content: `Item ${i}`, | ||
| })); | ||
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| <VirtualizedList | ||
| // @ts-expect-error: correct error here, 'height' property not passed | ||
| items={mockItems} | ||
| listHeight={400} | ||
| listMinHeight={400} | ||
| // @ts-expect-error: correct error here, 'height' property not passed | ||
| renderItem={(item: MockItem) => ({ id: item.id, content: item.content })} | ||
| onScrollEnd={() => {}} | ||
| />; | ||
| }); | ||
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| it('should render properly with items containing height property', () => { | ||
| type MockItemWithHeight = { id: number; content: string; height: number }; | ||
| const mockItems: MockItemWithHeight[] = Array.from({ length: 100 }, (_, i) => ({ | ||
| id: i, | ||
| content: `Item ${i}`, | ||
| height: 40, | ||
| })); | ||
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| <VirtualizedList | ||
| items={mockItems} | ||
| listHeight={400} | ||
| listMinHeight={400} | ||
| renderItem={(item: MockItemWithHeight) => ( | ||
| <div key={item.id} style={{ height: item.height }}> | ||
| {item.content} | ||
| </div> | ||
| )} | ||
| onScrollEnd={() => {}} | ||
| />; | ||
| }); | ||
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| it('should automatically type the renderItem() parameter according to the passed generic', () => { | ||
| type MockItemWithHeight = { id: number; content: string; height: number }; | ||
| const mockItems: MockItemWithHeight[] = Array.from({ length: 100 }, (_, i) => ({ | ||
| id: i, | ||
| content: `Item ${i}`, | ||
| height: 40, | ||
| })); | ||
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| <VirtualizedList | ||
| items={mockItems} | ||
| listHeight={400} | ||
| listMinHeight={400} | ||
| renderItem={item => { | ||
| const idNumber: number = item.id; | ||
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| return ( | ||
| <div key={idNumber} style={{ height: item.height }}> | ||
| {item.content} | ||
| </div> | ||
| ); | ||
| }} | ||
| onScrollEnd={() => {}} | ||
| />; | ||
| }); | ||
| }); | ||
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| describe('smoke tests', () => { | ||
| it('renders without crashing with minimal props', () => { | ||
| const mockItems = Array.from({ length: 3 }, (_, i) => ({ | ||
| id: i, | ||
| content: `Test Item ${i}`, | ||
| height: 40, | ||
| })); | ||
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| render( | ||
| <VirtualizedList | ||
| items={mockItems} | ||
| listHeight={200} | ||
| listMinHeight={200} | ||
| renderItem={item => ( | ||
| <div key={item.id} data-testid={`item-${item.id}`}> | ||
| {item.content} | ||
| </div> | ||
| )} | ||
| onScrollEnd={() => {}} | ||
| />, | ||
| ); | ||
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| // Verify the first item is rendered | ||
| expect(screen.getByTestId('item-0')).toBeTruthy(); | ||
| expect(screen.getByText('Test Item 0')).toBeTruthy(); | ||
| }); | ||
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| it('renders empty list without crashing', () => { | ||
| const { container } = render( | ||
| <VirtualizedList | ||
| items={[]} | ||
| listHeight={200} | ||
| listMinHeight={200} | ||
| renderItem={() => null} | ||
| onScrollEnd={() => {}} | ||
| />, | ||
| ); | ||
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| expect(container.firstChild).toBeTruthy(); | ||
| expect(container.firstChild?.textContent).toBe(''); | ||
| }); | ||
| }); | ||
| }); |
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