removeBaseField example

$this->assertTrue($this->entityDefinitionUpdateManager->needsUpdates(), 'EntityDefinitionUpdateManager reports that updates are needed.');
    $changes = $this->entityDefinitionUpdateManager->getChangeSummary();
    $this->assertCount(1, $changes['entity_test_update']);
    $this->assertEquals('The A new base field field needs to be updated.', strip_tags($changes['entity_test_update'][0]));
    $this->applyEntityUpdates();
    $this->assertFalse($this->database->schema()->fieldExists('entity_test_update', 'new_base_field'), 'Original column deleted in shared table for new_base_field.');
    $this->assertTrue($this->database->schema()->fieldExists('entity_test_update', 'new_base_field__value'), 'Value column created in shared table for new_base_field.');
    $this->assertTrue($this->database->schema()->fieldExists('entity_test_update', 'new_base_field__format'), 'Format column created in shared table for new_base_field.');

    // Remove the base field, ensure the update manager reports it, and the     // update deletes the schema.     $this->removeBaseField();
    $this->assertTrue($this->entityDefinitionUpdateManager->needsUpdates(), 'EntityDefinitionUpdateManager reports that updates are needed.');
    $changes = $this->entityDefinitionUpdateManager->getChangeSummary();
    $this->assertCount(1, $changes['entity_test_update']);
    $this->assertEquals('The A new base field field needs to be uninstalled.', strip_tags($changes['entity_test_update'][0]));
    $this->applyEntityUpdates();
    $this->assertFalse($this->database->schema()->fieldExists('entity_test_update', 'new_base_field_value'), 'Value column deleted from shared table for new_base_field.');
    $this->assertFalse($this->database->schema()->fieldExists('entity_test_update', 'new_base_field_format'), 'Format column deleted from shared table for new_base_field.');
  }

  /** * Tests creating, updating, and deleting a base field with no label set. * * See testBaseFieldCreateUpdateDeleteWithoutData() for more details */