Drupal Coding Standards Issues | phpcs

Problem/Motivation

Getting following error/warnings

FILE: /var/www/html/modules/contrib/file_link/tests/modules/file_link_test/file_link_test.routing.yml
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FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE
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7 | WARNING | Open page callback found, please add a comment before the line why there is no access restriction
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FILE: /var/www/html/modules/contrib/file_link/tests/src/Kernel/FileLinkValidationTest.php
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FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
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59 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
65 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
71 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
77 | WARNING | t() calls should be avoided in classes, use \Drupal\Core\StringTranslation\StringTranslationTrait and $this->t() instead
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Time: 1.1 secs; Memory: 6MB

Steps to reproduce

Run following command

phpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml modules/contrib/file_link/

Proposed resolution

Above error/warnings need to be fixed