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node_modules/pino/test/timestamp-nano.test.js

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+'use strict'
+
+/* eslint no-prototype-builtins: 0 */
+
+const test = require('node:test')
+const assert = require('node:assert')
+
+const { sink, once } = require('./helper')
+
+test('pino.stdTimeFunctions.isoTimeNano returns RFC 3339 timestamps', async () => {
+  // Mock Date.now at module initialization time
+  const now = Date.now
+  Date.now = () => new Date('2025-08-01T15:03:45.000000000Z').getTime()
+
+  // Mock process.hrtime.bigint at module initialization time
+  const hrTimeBigint = process.hrtime.bigint
+  process.hrtime.bigint = () => 100000000000000n
+
+  const pino = require('../')
+
+  const opts = {
+    timestamp: pino.stdTimeFunctions.isoTimeNano
+  }
+  const stream = sink()
+
+  // Mock process.hrtime.bigint at invocation time, add 1 day to the timestamp
+  process.hrtime.bigint = () => 100000000000000n + 86400012345678n
+
+  const instance = pino(opts, stream)
+  instance.info('foobar')
+  const result = await once(stream, 'data')
+  assert.equal(result.hasOwnProperty('time'), true)
+  assert.equal(result.time, '2025-08-02T15:03:45.012345678Z')
+
+  Date.now = now
+  process.hrtime.bigint = hrTimeBigint
+})