public function testAddHeaderColumns()
 {
     $this->_initConfigurableData();
     $this->assertEquals(['column_1', 'column_2', 'column_3', '_super_products_sku', '_super_attribute_code', '_super_attribute_option', '_super_attribute_price_corr'], $this->_model->addHeaderColumns(['column_1', 'column_2', 'column_3']));
 }
 public function testAddHeaderColumns()
 {
     $this->_initConfigurableData();
     $this->assertEquals(['column_1', 'column_2', 'column_3', 'configurable_variations', 'configurable_variation_labels'], $this->_model->addHeaderColumns(['column_1', 'column_2', 'column_3']));
 }