30 lines
1.2 KiB
JavaScript
30 lines
1.2 KiB
JavaScript
import { test } from 'cutest'
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import { simpleDiff } from '../lib/diff.mjs'
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import * as random from '../lib/prng/prng.mjs'
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function runDiffTest (t, a, b, expected) {
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let result = simpleDiff(a, b)
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t.compare(result, expected, `Compare "${a}" with "${b}"`)
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}
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test('diff tests', async function diff1 (t) {
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runDiffTest(t, 'abc', 'axc', { pos: 1, remove: 1, insert: 'x' })
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runDiffTest(t, 'bc', 'xc', { pos: 0, remove: 1, insert: 'x' })
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runDiffTest(t, 'ab', 'ax', { pos: 1, remove: 1, insert: 'x' })
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runDiffTest(t, 'b', 'x', { pos: 0, remove: 1, insert: 'x' })
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runDiffTest(t, '', 'abc', { pos: 0, remove: 0, insert: 'abc' })
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runDiffTest(t, 'abc', 'xyz', { pos: 0, remove: 3, insert: 'xyz' })
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runDiffTest(t, 'axz', 'au', { pos: 1, remove: 2, insert: 'u' })
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runDiffTest(t, 'ax', 'axy', { pos: 2, remove: 0, insert: 'y' })
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})
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test('random diff tests', async function randomDiff (t) {
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const gen = random.createPRNG(t.getSeed() * 1000000000)
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let a = random.word(gen)
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let b = random.word(gen)
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let change = simpleDiff(a, b)
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let arr = Array.from(a)
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arr.splice(change.pos, change.remove, ...Array.from(change.insert))
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t.assert(arr.join('') === b, 'Applying change information is correct')
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})
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