hasdata example

'field_name' => 'field_int',
      'entity_type' => 'entity_test',
      'type' => 'integer',
      'cardinality' => 2,
    ]);
    $field_storage->save();
    FieldConfig::create([
      'field_storage' => $field_storage,
      'bundle' => 'entity_test',
    ])->save();

    $this->assertFalse($field_storage->hasdata(), 'There are no entities with field data.');
    $this->assertSame(0, $this->storage->countFieldData($field_storage), 'There are 0 entities with field data.');

    // Create 1 entity without the field.     $entity = EntityTest::create();
    $entity->name->value = $this->randomMachineName();
    $entity->save();

    $this->assertFalse($field_storage->hasdata(), 'There are no entities with field data.');
    $this->assertSame(0, $this->storage->countFieldData($field_storage), 'There are 0 entities with field data.');

    // Create 12 entities to ensure that the purging works as expected.