11 files declare their use of BlockContent in Zircon Profile 8

BlockContentCreationTest.php in core/modules/block_content/src/Tests/BlockContentCreationTest.php

Contains \Drupal\block_content\Tests\BlockContentCreationTest.

BlockContentRevisionsTest.php in core/modules/block_content/src/Tests/BlockContentRevisionsTest.php

Contains \Drupal\block_content\Tests\BlockContentRevisionsTest.

BlockContentSaveTest.php in core/modules/block_content/src/Tests/BlockContentSaveTest.php

Contains \Drupal\block_content\Tests\BlockContentSaveTest.

BlockXssTest.php in core/modules/block/src/Tests/BlockXssTest.php

Contains \Drupal\block\Tests\BlockXssTest.

block_content_test.module in core/modules/block_content/tests/modules/block_content_test/block_content_test.module

A dummy module for testing custom block related hooks.

MigrateBlockContentTest.php in core/modules/block_content/src/Tests/Migrate/d6/MigrateBlockContentTest.php

Contains \Drupal\block_content\Tests\Migrate\d6\MigrateBlockContentTest.

MigrateBlockTest.php in core/modules/block/src/Tests/Migrate/d7/MigrateBlockTest.php

Contains \Drupal\block\Tests\Migrate\d7\MigrateBlockTest.

MigrateCustomBlockTest.php in core/modules/block_content/src/Tests/Migrate/d7/MigrateCustomBlockTest.php

Contains \Drupal\block_content\Tests\Migrate\d7\MigrateCustomBlockTest.

PageEditTest.php in core/modules/block_content/src/Tests/PageEditTest.php

Contains \Drupal\block_content\Tests\PageEditTest.

QuickEditLoadingTest.php in core/modules/quickedit/src/Tests/QuickEditLoadingTest.php

Contains \Drupal\quickedit\Tests\QuickEditLoadingTest.

RevisionRelationshipsTest.php in core/modules/block_content/src/Tests/Views/RevisionRelationshipsTest.php

Contains \Drupal\block_content\Tests\Views\RevisionRelationshipsTest.