Fix failing tests

Fix failing tests.
responsive_preview/tests/src/FunctionalJavascript/ResponsivePreviewTest.php

1) Drupal\Tests\responsive_preview\FunctionalJavascript\ResponsivePreviewTest::testToolbarIntegration
Failed asserting that false is true.

/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:55
/var/www/html/modules/contrib/responsive_preview/tests/src/FunctionalJavascript/ResponsivePreviewTest.php:72
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:728

2) Drupal\Tests\responsive_preview\FunctionalJavascript\ResponsivePreviewTest::testContentEdit
Failed asserting that false is true.

/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:55
/var/www/html/modules/contrib/responsive_preview/tests/src/FunctionalJavascript/ResponsivePreviewTest.php:94
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:728

responsive_preview/tests/src/Functional/ResponsivePreviewAdminTest.php

1) Drupal\Tests\responsive_preview\Functional\ResponsivePreviewAdminTest::testDeviceConfiguration
Device entity list table found.
Failed asserting that an array is not empty.

/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:122
/var/www/html/vendor/phpunit/phpunit/src/Framework/Constraint/Constraint.php:55
/var/www/html/modules/contrib/responsive_preview/tests/src/Functional/ResponsivePreviewAdminTest.php:47
/var/www/html/vendor/phpunit/phpunit/src/Framework/TestResult.php:728