14 files declare their use of FieldUnitTestBase in Zircon Profile 8.0

BooleanItemTest.php in core/modules/field/src/Tests/Boolean/BooleanItemTest.php

Contains \Drupal\field\Tests\Boolean\BooleanItemTest.

CommentItemTest.php in core/modules/comment/src/Tests/CommentItemTest.php

Contains \Drupal\comment\Tests\CommentItemTest.

DateTimeItemTest.php in core/modules/datetime/src/Tests/DateTimeItemTest.php

Contains \Drupal\datetime\Tests\DateTimeItemTest.

EmailItemTest.php in core/modules/field/src/Tests/Email/EmailItemTest.php

Contains \Drupal\field\Tests\Email\EmailItemTest.

EntityReferenceItemTest.php in core/modules/field/src/Tests/EntityReference/EntityReferenceItemTest.php

Contains \Drupal\field\Tests\EntityReference\EntityReferenceItemTest.

FieldRdfaTestBase.php in core/modules/rdf/src/Tests/Field/FieldRdfaTestBase.php

Contains \Drupal\rdf\Tests\Field\FieldRdfaTestBase.

FileItemTest.php in core/modules/file/src/Tests/FileItemTest.php

Contains \Drupal\file\Tests\FileItemTest.

ImageItemTest.php in core/modules/image/src/Tests/ImageItemTest.php

Contains \Drupal\image\Tests\ImageItemTest.

LinkItemTest.php in core/modules/link/src/Tests/LinkItemTest.php

Contains \Drupal\link\Tests\LinkItemTest.

NumberItemTest.php in core/modules/field/src/Tests/Number/NumberItemTest.php

Contains \Drupal\field\Tests\Number\NumberItemTest.

OptionsFieldUnitTestBase.php in core/modules/options/src/Tests/OptionsFieldUnitTestBase.php

Contains \Drupal\options\Tests\OptionsFieldUnitTestBase.

TelephoneItemTest.php in core/modules/telephone/src/Tests/TelephoneItemTest.php

Contains \Drupal\telephone\Tests\TelephoneItemTest.

TextWithSummaryItemTest.php in core/modules/text/src/Tests/TextWithSummaryItemTest.php

Contains \Drupal\text\Tests\TextWithSummaryItemTest.

UriItemTest.php in core/modules/field/src/Tests/Uri/UriItemTest.php

Contains \Drupal\field\Tests\Uri\UriItemTest.