Issue #2751465: Add tests coverage for configuration translation

Kieran Cottrequested to merge
issue/eu_cookie_compliance-2751465:2751465-add-tests-coverage into 8.x-1.x

Adds tests for:

  • Functional config translation coverage
  • JavaScript popup behaviour coverage
  • JavaScript translated popup coverage

Uses https://www.drupal.org/files/issues/2019-07-23/2751465-13.patch for reference.

Verification passed:

  • PHP syntax checks on all three files
  • phpcs --standard=Drupal,DrupalPractice
  • Focused PHPUnit run in DDEV with temporary Selenium/Chromium: 3 tests, 23 assertions
  • Only PHPUnit deprecation notices were reported

Closes #2751465

Edited by Kieran Cott

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