Check if a field storage config entity was created for the paragraph.
string $field_name: The field to test for.
string $field_type: The expected field type.
protected function assertParagraphEntityFieldExists($field_name, $field_type) {
$field_storage = FieldStorageConfig::loadByName('paragraph', $field_name);
$this
->assertNotNull($field_storage);
$this
->assertEquals($field_type, $field_storage
->getType());
}