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node_modules/pino/test/mixin-merge-strategy.test.js

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+'use strict'
+
+const test = require('node:test')
+const assert = require('node:assert')
+
+const { sink, once } = require('./helper')
+const pino = require('../')
+
+const level = 50
+const name = 'error'
+
+test('default merge strategy', async () => {
+  const stream = sink()
+  const instance = pino({
+    base: {},
+    mixin () {
+      return { tag: 'k8s' }
+    }
+  }, stream)
+  instance.level = name
+  instance[name]({
+    tag: 'local'
+  }, 'test')
+  const result = await once(stream, 'data')
+  assert.ok(new Date(result.time) <= new Date(), 'time is greater than Date.now()')
+  delete result.time
+  assert.deepEqual(result, {
+    level,
+    msg: 'test',
+    tag: 'local'
+  })
+})
+
+test('custom merge strategy with mixin priority', async () => {
+  const stream = sink()
+  const instance = pino({
+    base: {},
+    mixin () {
+      return { tag: 'k8s' }
+    },
+    mixinMergeStrategy (mergeObject, mixinObject) {
+      return Object.assign(mergeObject, mixinObject)
+    }
+  }, stream)
+  instance.level = name
+  instance[name]({
+    tag: 'local'
+  }, 'test')
+  const result = await once(stream, 'data')
+  assert.ok(new Date(result.time) <= new Date(), 'time is greater than Date.now()')
+  delete result.time
+  assert.deepEqual(result, {
+    level,
+    msg: 'test',
+    tag: 'k8s'
+  })
+})