c3edad29ba
The 1e9 → '1000M' test row read as a snapshot of a missing rung; the formatter comment now states the cap (token/cost figures stay well under a billion; a B suffix would collide with the bytes reading) and the row cites it.
29 lines
823 B
TypeScript
29 lines
823 B
TypeScript
import { describe, expect, it } from 'vitest'
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import { compactNumber } from './format'
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describe('compactNumber', () => {
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it.each([
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[0, '0'],
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[999, '999'],
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[1000, '1k'],
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[1500, '1.5k'],
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[128_000, '128k'],
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// Promotion guard: a value that would round to "1000k" promotes to M.
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[999_949, '999.9k'],
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[999_999, '1M'],
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[1_000_000, '1M'],
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[1_500_000, '1.5M'],
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// `M` is the declared top rung (see format.ts): no `B`, so billions stay in M.
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[1_000_000_000, '1000M']
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])('%d → %s', (value, expected) => {
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expect(compactNumber(value)).toBe(expected)
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})
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it('never emits a unit-boundary artifact like "1000k" or "1000"', () => {
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for (const value of [999.5, 999.9, 999_950, 999_999.4]) {
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expect(compactNumber(value)).not.toMatch(/^1000(\.\d)?k?$/)
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}
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})
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})
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