8 files declare their use of MigrateTestCase in Zircon Profile 8

Drupal6SqlBaseTest.php in core/modules/migrate_drupal/tests/src/Unit/source/d6/Drupal6SqlBaseTest.php

Contains \Drupal\Tests\migrate_drupal\Unit\source\d6\Drupal6SqlBaseTest.

FieldInstanceSettingsTest.php in core/modules/field/tests/src/Unit/Plugin/migrate/process/d7/FieldInstanceSettingsTest.php

Contains \Drupal\Tests\field\Unit\Plugin\migrate\process\d7\FieldInstanceSettingsTest.

FieldSettingsTest.php in core/modules/field/tests/src/Unit/Plugin/migrate/process/d7/FieldSettingsTest.php

Contains \Drupal\Tests\field\Unit\Plugin\migrate\process\d7\FieldInstanceSettingsTest.

FileUriTest.php in core/modules/file/tests/src/Unit/Plugin/migrate/process/d6/FileUriTest.php

Contains \Drupal\Tests\file\Unit\Plugin\migrate\process\d6\FileUriTest.

IteratorTest.php in core/modules/migrate/tests/src/Unit/process/IteratorTest.php

Contains \Drupal\Tests\migrate\Unit\process\IteratorTest.

MigrateProcessTestCase.php in core/modules/migrate/tests/src/Unit/process/MigrateProcessTestCase.php

Contains \Drupal\Tests\migrate\Unit\process\MigrateProcessTestCase.

PerComponentEntityDisplayTest.php in core/modules/migrate/tests/src/Unit/destination/PerComponentEntityDisplayTest.php

Contains \Drupal\Tests\migrate\Unit\destination\PerComponentEntityDisplayTest.

PerComponentEntityFormDisplayTest.php in core/modules/migrate/tests/src/Unit/destination/PerComponentEntityFormDisplayTest.php

Contains \Drupal\Tests\migrate\Unit\destination\PerComponentEntityFormDisplayTest.