feat: add endpoint to estimate guest cart shipping methods

Author: ahinkle

README.md

@@ -179,6 +179,13 @@ Add/update the specified cart item.
 $magento->api('guestCarts')->addItem($cartId, $sku, $quantity);
 ```
 
+`/V1/guest-carts/{cartId}/estimate-shipping-methods`
+
+Estimate shipping by address and return list of available shipping methods.
+```php
+$magento->api('guestCarts')->estimateShippingMethods($cartId);
+```
+
 <a id="product-attributes"></a>
 ### Product Attributes (catalogProductAttributeRepositoryV1)
 

src/Api/GuestCarts.php

@@ -62,4 +62,16 @@ public function totals($cartId)
     {
         return $this->get('/guest-carts/'.$cartId.'/totals');
     }
+
+    /**
+     * Estimate shipping by address and return list of available shipping methods.
+     *
+     * @param  string $cartId
+     * @param  array  $body
+     * @return array
+     */
+    public function estimateShippingMethods($cartId, $body = [])
+    {
+        return $this->post('/guest-carts/'.$cartId.'/estimate-shipping-methods', $body);
+    }
 }

tests/Api/GuestCartsTest.php

@@ -69,4 +69,17 @@ public function test_can_call_guest_carts_totals()
 
         $this->assertTrue($api->ok());
     }
+
+    public function test_can_call_guest_carts_estimate_shipping_methods()
+    {
+        Http::fake([
+            '*rest/all/V1/guest-carts/foo/estimate-shipping-methods' => Http::response([], 200),
+        ]);
+
+        $magento = new Magento();
+
+        $api = $magento->api('guestCarts')->estimateShippingMethods('foo');
+
+        $this->assertTrue($api->ok());
+    }
 }