feat: add customer cart estimate shipping methods endpoint

Author: ahinkle

src/Api/Carts.php

@@ -15,4 +15,17 @@ public function mine()
 
         return $this->get('/carts/mine');
     }
+
+    /**
+     * Estimate shipping by address and return list of available shipping methods.
+     *
+     * @param  array  $body
+     * @return array
+     */
+    public function estimateShippingMethods($body = [])
+    {
+        $this->validateSingleStoreCode();
+        
+        return $this->post('/carts/mine/estimate-shipping-methods', $body);
+    }
 }

tests/Api/CartsTest.php

@@ -34,4 +34,26 @@ public function test_must_pass_a_single_store_code_to_carts_mine()
         $magento = new Magento();
         $magento->api('carts')->mine();
     }
+
+    public function test_can_call_carts_estimate_shipping_methods()
+    {
+        Http::fake([
+            '*rest/default/V1/carts/mine/estimate-shipping-methods' => Http::response([], 200),
+        ]);
+
+        $magento = new Magento();
+        $magento->storeCode = 'default';
+
+        $api = $magento->api('carts')->estimateShippingMethods([]);
+
+        $this->assertTrue($api->ok());
+    }
+
+    public function test_must_pass_a_single_store_code_to_estimate_shipping_methods()
+    {
+        $this->expectException('exception');
+
+        $magento = new Magento();
+        $magento->api('carts')->estimateShippingMethods([]);
+    }
 }