WC_Product::set_regular_price PHP Method

    public function set_regular_price($price)
    {
        $this->set_prop('regular_price', wc_format_decimal($price));
    }

 /**
  * Test creating a new product.
  *
  * @since 2.7.0
  */
 function test_product_create()
 {
     $product = new WC_Product();
     $product->set_regular_price(42);
     $product->set_name('My Product');
     $product->save();
     $read_product = new WC_Product($product->get_id());
     $this->assertEquals('42', $read_product->get_regular_price());
     $this->assertEquals('My Product', $read_product->get_name());
 }