8 files declare their use of CreateTestContentEntitiesTrait

CredentialFormTest.php in core/modules/migrate_drupal_ui/tests/src/Functional/CredentialFormTest.php
MigrateDrupal6AuditIdsTest.php in core/modules/migrate_drupal/tests/src/Kernel/d6/MigrateDrupal6AuditIdsTest.php
MigrateDrupal7AuditIdsTest.php in core/modules/migrate_drupal/tests/src/Kernel/d7/MigrateDrupal7AuditIdsTest.php
MigrateNodeCompleteTest.php in core/modules/node/tests/src/Kernel/Migrate/d6/MigrateNodeCompleteTest.php
MigrateNodeCompleteTest.php in core/modules/node/tests/src/Kernel/Migrate/d7/MigrateNodeCompleteTest.php
MigrateUpgradeExecuteTestBase.php in core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeExecuteTestBase.php
MigrateUpgradeFormStepsTest.php in core/modules/migrate_drupal_ui/tests/src/Functional/MigrateUpgradeFormStepsTest.php
MultilingualReviewPageTestBase.php in core/modules/migrate_drupal_ui/tests/src/Functional/MultilingualReviewPageTestBase.php

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