ENGCOM-7020: magento/magento2#: Test Coverage. API functional tests. removeItemFromCart #26563

 - Merge Pull Request #26563 from atwixfirster/magento2:api-functional-graphql-removeItemFromCart
 - Merged commits:
   1. d64082f
   2. c3a9acd
   3. b37b091

Author: magento-engcom-team

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveItemFromCartTest.php

@@ -155,6 +155,40 @@ public function testRemoveItemFromAnotherCustomerCart()
         $this->graphQlMutation($query, [], '', $this->getHeaderMap('[email protected]'));
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testRemoveItemWithEmptyCartId()
+    {
+        $cartId = "";
+        $cartItemId = $this->getQuoteItemIdByReservedQuoteIdAndSku->execute('test_quote', 'simple_product');
+
+        $this->expectExceptionMessage("Required parameter \"cart_id\" is missing.");
+
+        $query = $this->getQuery($cartId, $cartItemId);
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testRemoveItemWithZeroCartItemId()
+    {
+        $cartId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $cartItemId = 0;
+
+        $this->expectExceptionMessage("Required parameter \"cart_item_id\" is missing.");
+
+        $query = $this->getQuery($cartId, $cartItemId);
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
     /**
      * @param string $maskedQuoteId
      * @param int $itemId

dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveItemFromCartTest.php

@@ -119,6 +119,38 @@ public function testRemoveItemFromCustomerCart()
         $this->graphQlMutation($query);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testRemoveItemWithEmptyCartId()
+    {
+        $cartId = "";
+        $cartItemId = $this->getQuoteItemIdByReservedQuoteIdAndSku->execute('test_quote', 'simple_product');
+
+        $this->expectExceptionMessage("Required parameter \"cart_id\" is missing.");
+
+        $query = $this->getQuery($cartId, $cartItemId);
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
+     * @magentoApiDataFixture Magento/GraphQl/Quote/_files/add_simple_product.php
+     */
+    public function testRemoveItemWithZeroCartItemId()
+    {
+        $cartId = $this->getMaskedQuoteIdByReservedOrderId->execute('test_quote');
+        $cartItemId = 0;
+
+        $this->expectExceptionMessage("Required parameter \"cart_item_id\" is missing.");
+
+        $query = $this->getQuery($cartId, $cartItemId);
+        $this->graphQlMutation($query);
+    }
+
     /**
      * @param string $maskedQuoteId
      * @param int $itemId