Simplify invalid date deprecation warning test

Co-authored-by: charmander <1889843+charmander@users.noreply.github.com>

Author: Copilot

packages/pg/lib/utils.js

@@ -1,11 +1,11 @@
 'use strict'
 
 const defaults = require('./defaults')
-const { deprecate, types } = require('util')
+const nodeUtils = require('util')
 
-const { isDate } = types
+const { isDate } = require('util/types')
 
-const invalidDateDeprecationNotice = deprecate(
+const invalidDateDeprecationNotice = nodeUtils.deprecate(
   () => {},
   'Sending an invalid date to Postgres is deprecated and will throw an error in the next major version of pg. Ensure any Date object passed as a query parameter is valid.',
   'PG_INVALID_DATE'

packages/pg/test/unit/utils-tests.js

@@ -89,22 +89,15 @@ test('prepareValues: 1 BC date prepared properly', function () {
   helper.resetTimezoneOffset()
 })
 
-test('prepareValues: invalid date emits deprecation warning', function () {
-  const date = new Date(undefined)
-
+test('prepareValue: invalid date emits deprecation warning', function () {
   const warningPromise = new Promise((resolve) => {
-    const onWarning = (warning) => {
-      if (warning.code === 'PG_INVALID_DATE') {
-        process.removeListener('warning', onWarning)
-        resolve(warning)
-      }
-    }
-    process.on('warning', onWarning)
+    process.once('warning', (warning) => {
+      resolve(warning)
+    })
   })
 
-  const out = utils.prepareValue(date)
+  const out = utils.prepareValue(new Date(undefined))
 
-  // still serializes (for backwards compatibility) but warns that this is deprecated
   assert.strictEqual(out, '0NaN-NaN-NaNTNaN:NaN:NaN.NaN+NaN:NaN')
 
   return warningPromise