diff --git a/core/modules/locale/tests/locale_test.js b/core/modules/locale/tests/locale_test.js
deleted file mode 100644
index 86acc4a13c..0000000000
--- a/core/modules/locale/tests/locale_test.js
+++ /dev/null
@@ -1,38 +0,0 @@
-/**
-* DO NOT EDIT THIS FILE.
-* See the following change record for more information,
-* https://www.drupal.org/node/2815083
-* @preserve
-**/
-
-Drupal.t("Standard Call t");
-Drupal.t("Whitespace Call t");
-
-Drupal.t('Single Quote t');
-Drupal.t('Single Quote \'Escaped\' t');
-Drupal.t('Single Quote ' + 'Concat ' + 'strings ' + 't');
-
-Drupal.t("Double Quote t");
-Drupal.t("Double Quote \"Escaped\" t");
-Drupal.t("Double Quote " + "Concat " + "strings " + "t");
-
-Drupal.t("Context Unquoted t", {}, { context: "Context string unquoted" });
-Drupal.t("Context Single Quoted t", {}, { 'context': "Context string single quoted" });
-Drupal.t("Context Double Quoted t", {}, { "context": "Context string double quoted" });
-
-Drupal.t("Context !key Args t", { '!key': 'value' }, { context: "Context string" });
-
-Drupal.formatPlural(1, "Standard Call plural", "Standard Call @count plural");
-Drupal.formatPlural(1, "Whitespace Call plural", "Whitespace Call @count plural");
-
-Drupal.formatPlural(1, 'Single Quote plural', 'Single Quote @count plural');
-Drupal.formatPlural(1, 'Single Quote \'Escaped\' plural', 'Single Quote \'Escaped\' @count plural');
-
-Drupal.formatPlural(1, "Double Quote plural", "Double Quote @count plural");
-Drupal.formatPlural(1, "Double Quote \"Escaped\" plural", "Double Quote \"Escaped\" @count plural");
-
-Drupal.formatPlural(1, "Context Unquoted plural", "Context Unquoted @count plural", {}, { context: "Context string unquoted" });
-Drupal.formatPlural(1, "Context Single Quoted plural", "Context Single Quoted @count plural", {}, { 'context': "Context string single quoted" });
-Drupal.formatPlural(1, "Context Double Quoted plural", "Context Double Quoted @count plural", {}, { "context": "Context string double quoted" });
-
-Drupal.formatPlural(1, "Context !key Args plural", "Context !key Args @count plural", { '!key': 'value' }, { context: "Context string" });
\ No newline at end of file
diff --git a/core/modules/locale/tests/locale_test.es6.js b/core/modules/locale/tests/locale_test.js.fake
similarity index 90%
rename from core/modules/locale/tests/locale_test.es6.js
rename to core/modules/locale/tests/locale_test.js.fake
index ba62b7504e..072345f7fd 100644
--- a/core/modules/locale/tests/locale_test.es6.js
+++ b/core/modules/locale/tests/locale_test.js.fake
@@ -2,7 +2,10 @@
  * @file
  * JavaScript for locale_test.module.
  *
- * @ignore
+ * @preserve
+ * The Locale module parses the strings in JavaScript files with a simple regex.
+ * We need to keep this non-ES6 original file for testing purpose. There is no
+ * ES6 version available.
  */
 
 Drupal.t("Standard Call t");
diff --git a/core/modules/locale/tests/src/Functional/LocaleJavascriptTranslationTest.php b/core/modules/locale/tests/src/Functional/LocaleJavascriptTranslationTest.php
index bbb825832b..f96a37bde5 100644
--- a/core/modules/locale/tests/src/Functional/LocaleJavascriptTranslationTest.php
+++ b/core/modules/locale/tests/src/Functional/LocaleJavascriptTranslationTest.php
@@ -21,7 +21,7 @@ class LocaleJavascriptTranslationTest extends BrowserTestBase {
   public static $modules = ['locale', 'locale_test'];
 
   public function testFileParsing() {
-    $filename = __DIR__ . '/../../locale_test.js';
+    $filename = __DIR__ . '/../../locale_test.js.fake';
 
     // Parse the file to look for source strings.
     _locale_parse_js_file($filename);