Set the default field storage backend for fields created during tests.
Overrides FieldTestCase::setUp
function setUp() {
parent::setUp('field_test');
$this->field = array(
'field_name' => drupal_strtolower($this
->randomName()),
'type' => 'test_field',
);
field_create_field($this->field);
$this->instance_definition = array(
'field_name' => $this->field['field_name'],
'entity_type' => 'test_entity',
'bundle' => 'test_bundle',
);
}