mirror of
https://github.com/Permissionless-Software-Foundation/psf-memo.git
synced 2026-09-21 16:52:01 -07:00
Chris Troutner
e77e174c92
Extract the pure failed-image set transition into a testable service, DRY the acceptance no-link/no-image assertions, and add property tests for image URL detection, alt text, and image rendering. By refactorer.
38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
/*
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Unit tests for the failed-image state transition used by the post renderer.
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The transition is pure: it either returns the same set (when the URL is
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already tracked, so React can skip a re-render) or a new set with the URL
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added, and it never mutates the input set.
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*/
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'use strict'
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const test = require('node:test')
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const assert = require('node:assert/strict')
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const { addFailedImage } = require('../../src/services/failed-images')
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const URL_A = 'https://i.imgur.com/swCI56T.jpeg'
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const URL_B = 'https://cdn.example.com/pics/Sunset.PNG'
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test('addFailedImage returns a new set containing the added URL', () => {
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const original = new Set()
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const next = addFailedImage(original, URL_A)
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assert.notEqual(next, original)
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assert.deepEqual([...next], [URL_A])
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assert.equal(original.size, 0)
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})
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test('addFailedImage returns the same set when the URL is already present', () => {
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const original = new Set([URL_A])
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const next = addFailedImage(original, URL_A)
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assert.equal(next, original)
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})
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test('addFailedImage preserves existing entries and does not mutate the input', () => {
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const original = new Set([URL_A])
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const next = addFailedImage(original, URL_B)
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assert.deepEqual([...next].sort(), [URL_B, URL_A].sort())
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assert.deepEqual([...original], [URL_A])
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})
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