sync mode on

node_modules/pino/test/transport/sync-false.test.js

@@ -0,0 +1,70 @@
+'use strict'
+
+const test = require('node:test')
+const assert = require('node:assert')
+const os = require('node:os')
+const { join } = require('node:path')
+const { readFile } = require('node:fs').promises
+const { promisify } = require('node:util')
+
+const pino = require('../..')
+const { watchFileCreated, file } = require('../helper')
+
+const { pid } = process
+const hostname = os.hostname()
+
+test('thread-stream async flush', async () => {
+  const destination = file()
+  const transport = pino.transport({
+    target: join(__dirname, '..', 'fixtures', 'to-file-transport.js'),
+    options: { destination }
+  })
+  const instance = pino(transport)
+  instance.info('hello')
+
+  assert.equal(instance.flush(), undefined)
+
+  await watchFileCreated(destination)
+  const result = JSON.parse(await readFile(destination))
+  delete result.time
+  assert.deepEqual(result, {
+    pid,
+    hostname,
+    level: 30,
+    msg: 'hello'
+  })
+})
+
+test('thread-stream async flush should call the passed callback', async () => {
+  const outputPath = file()
+  async function getOutputLogLines () {
+    return (await readFile(outputPath)).toString().trim().split('\n').map(JSON.parse)
+  }
+  const transport = pino.transport({
+    target: join(__dirname, '..', 'fixtures', 'to-file-transport.js'),
+    options: { destination: outputPath }
+  })
+  const instance = pino(transport)
+  const flushPromise = promisify(instance.flush).bind(instance)
+
+  instance.info('hello')
+  await flushPromise()
+  await watchFileCreated(outputPath)
+
+  const [firstFlushData] = await getOutputLogLines()
+
+  assert.equal(firstFlushData.msg, 'hello')
+
+  // should not flush this as no data accumulated that's bigger than min length
+  instance.info('world')
+
+  // Making sure data is not flushed yet
+  const afterLogData = await getOutputLogLines()
+  assert.equal(afterLogData.length, 1)
+
+  await flushPromise()
+
+  // Making sure data is not flushed yet
+  const afterSecondFlush = (await getOutputLogLines())[1]
+  assert.equal(afterSecondFlush.msg, 'world')
+})