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feat: upload input v3 image preview improvement #263
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98 changes: 98 additions & 0 deletions
98
src/components/progressive-img/__tests__/progressive-img.test.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /** | ||
| * Copyright 2018 OpenStack Foundation | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| **/ | ||
|
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| import React from 'react'; | ||
| import { render, screen, fireEvent, act } from '@testing-library/react'; | ||
| import '@testing-library/jest-dom'; | ||
| import ProgressiveImg from '../index'; | ||
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| describe('ProgressiveImg', () => { | ||
| describe('dataURL src', () => { | ||
| test('renders dataURL immediately without placeholder or blur', () => { | ||
| const dataURL = 'data:image/jpeg;base64,abc123'; | ||
| render(<ProgressiveImg src={dataURL} alt="test image" placeholderSrc="placeholder.png" />); | ||
| const img = screen.getByRole('img', { name: 'test image' }); | ||
| expect(img).toHaveAttribute('src', dataURL); | ||
| expect(img.className).toContain('loaded'); | ||
| expect(img.className).not.toContain('loading'); | ||
| }); | ||
|
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| test('updates immediately when src changes to a dataURL', () => { | ||
| const serverURL = 'https://cdn.example.com/photo.jpg'; | ||
| const dataURL = 'data:image/jpeg;base64,abc123'; | ||
| const { rerender } = render(<ProgressiveImg src={serverURL} alt="test image" placeholderSrc="placeholder.png" />); | ||
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| rerender(<ProgressiveImg src={dataURL} alt="test image" placeholderSrc="placeholder.png" />); | ||
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| const img = screen.getByRole('img', { name: 'test image' }); | ||
| expect(img).toHaveAttribute('src', dataURL); | ||
| expect(img.className).toContain('loaded'); | ||
| }); | ||
| }); | ||
|
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| describe('URL src', () => { | ||
| let mockImageInstances; | ||
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| beforeEach(() => { | ||
| mockImageInstances = []; | ||
| global.Image = jest.fn().mockImplementation(() => { | ||
| const instance = { src: '', onload: null, onerror: null }; | ||
| mockImageInstances.push(instance); | ||
| return instance; | ||
| }); | ||
| }); | ||
|
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| afterEach(() => { | ||
| delete global.Image; | ||
| }); | ||
|
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| test('renders placeholder initially while loading a URL', () => { | ||
| render(<ProgressiveImg src="https://cdn.example.com/photo.jpg" alt="test" placeholderSrc="placeholder.png" />); | ||
| const img = screen.getByRole('img', { name: 'test' }); | ||
| expect(img).toHaveAttribute('src', 'placeholder.png'); | ||
| expect(img.className).toContain('loading'); | ||
| }); | ||
|
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| test('switches to actual src on successful load', () => { | ||
| const src = 'https://cdn.example.com/photo.jpg'; | ||
| render(<ProgressiveImg src={src} alt="test" placeholderSrc="placeholder.png" />); | ||
| act(() => { mockImageInstances[0].onload(); }); | ||
| const img = screen.getByRole('img', { name: 'test' }); | ||
| expect(img).toHaveAttribute('src', src); | ||
| expect(img.className).toContain('loaded'); | ||
| }); | ||
|
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| test('falls back to file_icon on error for unknown extension', () => { | ||
| render(<ProgressiveImg src="https://cdn.example.com/photo.jpg" alt="test" />); | ||
| act(() => { mockImageInstances[0].onerror(); }); | ||
| const img = screen.getByRole('img', { name: 'test' }); | ||
| expect(img.className).toContain('loaded'); | ||
| expect(img).not.toHaveAttribute('src', 'https://cdn.example.com/photo.jpg'); | ||
| }); | ||
|
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| test('does not apply stale src when src changes before the first load completes', () => { | ||
| const firstURL = 'https://cdn.example.com/slow.jpg'; | ||
| const secondURL = 'https://cdn.example.com/fast.jpg'; | ||
| const { rerender } = render(<ProgressiveImg src={firstURL} alt="test" placeholderSrc="placeholder.png" />); | ||
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| // Change src before firstURL loads — simulates the serverURL → dataURL swap in upload flow | ||
| rerender(<ProgressiveImg src={secondURL} alt="test" placeholderSrc="placeholder.png" />); | ||
|
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| // Trigger the first (now-cancelled) effect's onload | ||
| act(() => { mockImageInstances[0].onload(); }); | ||
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| const img = screen.getByRole('img', { name: 'test' }); | ||
| expect(img).not.toHaveAttribute('src', firstURL); | ||
| }); | ||
| }); | ||
| }); |
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