diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
index aca13e53875dd..e1b93e0bdb857 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddSimpleProductToCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Customer;
 
+use Exception;
 use Magento\Framework\Exception\AuthenticationException;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
@@ -53,11 +54,117 @@ public function testAddSimpleProductToCart()
         self::assertEquals($sku, $response['addSimpleProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddSimpleProductToCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddSimpleProductToCartIfCartIdIsEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddSimpleProductToCartIfCartItemsAreMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id"
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddSimpleProductToCartIfCartItemsAreEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testAddProductToNonExistentCart()
@@ -74,7 +181,7 @@ public function testAddProductToNonExistentCart()
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a product with SKU "simple_product"
      */
     public function testNonExistentProductToCart()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
index 86573dcde2e35..ae0208ca3101b 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/AddVirtualProductToCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Customer;
 
+use Exception;
 use Magento\Framework\Exception\AuthenticationException;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
@@ -53,11 +54,117 @@ public function testAddVirtualProductToCart()
         self::assertEquals($sku, $response['addVirtualProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddVirtualProductToCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddVirtualProductToCartIfCartIdIsEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddVirtualProductToCartIfCartItemsAreMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id"
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddVirtualProductToCartIfCartItemsAreEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/virtual_product.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testAddVirtualToNonExistentCart()
@@ -74,7 +181,7 @@ public function testAddVirtualToNonExistentCart()
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a product with SKU "virtual_product"
      */
     public function testNonExistentProductToCart()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
index 99e1c0bbd1579..77c69ee3e2b83 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/GetCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Customer;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
 use Magento\TestFramework\Helper\Bootstrap;
@@ -94,10 +95,41 @@ public function testGetAnotherCustomerCart()
         $this->graphQlQuery($query, [], '', $this->getHeaderMap('customer2@search.example.com'));
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testGetCartIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Field "cart" argument "cart_id" of type "String!" is required but not provided.
+     */
+    public function testGetCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+{
+  cart {
+    email
+  }
+}
+QUERY;
+
+        $this->graphQlQuery($query, [], '', $this->getHeaderMap());
+    }
+
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testGetNonExistentCart()
@@ -113,7 +145,7 @@ public function testGetNonExistentCart()
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/make_cart_inactive.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Current user does not have an active cart.
      */
     public function testGetInactiveCart()
@@ -145,7 +177,7 @@ public function testGetCartWithNotDefaultStore()
      * @magentoApiDataFixture Magento/Checkout/_files/active_quote.php
      * @magentoApiDataFixture Magento/Store/_files/second_store.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Wrong store code specified for cart
      */
     public function testGetCartWithWrongStore()
@@ -162,7 +194,7 @@ public function testGetCartWithWrongStore()
     /**
      * @magentoApiDataFixture Magento/Checkout/_files/active_quote_customer_not_default_store.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Requested store is not found
      */
     public function testGetCartWithNotExistingStore()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/PlaceOrderTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/PlaceOrderTest.php
index 47d0d661fb33c..591bac1c35ba6 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/PlaceOrderTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/PlaceOrderTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Customer;
 
+use Exception;
 use Magento\Framework\Registry;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
@@ -83,6 +84,39 @@ public function testPlaceOrder()
         self::assertEquals($reservedOrderId, $response['placeOrder']['order']['order_id']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testPlaceOrderIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testPlaceOrderIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  placeOrder(input: {}) {
+    order {
+      order_id
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveCouponFromCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveCouponFromCartTest.php
index ce1c85417b165..f906b33fe19d1 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveCouponFromCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Customer/RemoveCouponFromCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Customer;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Integration\Api\CustomerTokenServiceInterface;
 use Magento\TestFramework\Helper\Bootstrap;
@@ -58,7 +59,43 @@ public function testRemoveCouponFromCart()
 
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
-     * @expectedException \Exception
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testRemoveCouponFromCartIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testRemoveCouponFromCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  removeCouponFromCart(input: {}) {
+    cart {
+      applied_coupon {
+        code
+      }
+    }
+  }
+}
+
+QUERY;
+
+        $this->graphQlMutation($query, [], '', $this->getHeaderMap());
+    }
+
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testRemoveCouponFromNonExistentCart()
@@ -72,7 +109,7 @@ public function testRemoveCouponFromNonExistentCart()
     /**
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/customer/create_empty_cart.php
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Cart does not contain products
      */
     public function testRemoveCouponFromEmptyCart()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
index 9a943cf4b204e..4deed99243f9d 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddSimpleProductToCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Guest;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
@@ -48,10 +49,112 @@ public function testAddSimpleProductToCart()
         self::assertEquals($sku, $response['addSimpleProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddSimpleProductToCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddSimpleProductToCartIfCartIdIsEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddSimpleProductToCartIfCartItemsAreMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id"
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddSimpleProductToCartIfCartItemsAreEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
     /**
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testAddProductToNonExistentCart()
@@ -67,7 +170,7 @@ public function testAddProductToNonExistentCart()
     /**
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a product with SKU "simple_product"
      */
     public function testNonExistentProductToCart()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
index cadbec857c2d6..131ff0c480d64 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/AddVirtualProductToCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Guest;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
@@ -48,10 +49,112 @@ public function testAddVirtualProductToCart()
         self::assertEquals($sku, $response['addVirtualProductsToCart']['cart']['items'][0]['product']['sku']);
     }
 
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddVirtualProductToCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testAddVirtualProductToCartIfCartIdIsEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddVirtualProductToCartIfCartItemsAreMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id"
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_items" is missing
+     */
+    public function testAddVirtualProductToCartIfCartItemsAreEmpty()
+    {
+        $query = <<<QUERY
+mutation {
+  addSimpleProductsToCart(
+    input: {
+      cart_id: "cart_id",
+      cart_items: []
+    }
+  ) {
+    cart {
+      items {
+        id
+      }
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
     /**
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/virtual_product.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testAddVirtualToNonExistentCart()
@@ -67,7 +170,7 @@ public function testAddVirtualToNonExistentCart()
     /**
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a product with SKU "virtual_product"
      */
     public function testNonExistentProductToCart()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
index b35d689af7d20..d39f1b42459c7 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/GetCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Guest;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
@@ -71,7 +72,36 @@ public function testGetCustomerCart()
     }
 
     /**
-     * @expectedException \Exception
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testGetCartIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlQuery($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Field "cart" argument "cart_id" of type "String!" is required but not provided.
+     */
+    public function testGetCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+{
+  cart {
+    email
+  }
+}
+QUERY;
+
+        $this->graphQlQuery($query);
+    }
+
+    /**
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testGetNonExistentCart()
@@ -86,7 +116,7 @@ public function testGetNonExistentCart()
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/make_cart_inactive.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Current user does not have an active cart.
      */
     public function testGetInactiveCart()
@@ -116,7 +146,7 @@ public function testGetCartWithNotDefaultStore()
      * @magentoApiDataFixture Magento/Checkout/_files/active_quote.php
      * @magentoApiDataFixture Magento/Store/_files/second_store.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Wrong store code specified for cart
      */
     public function testGetCartWithWrongStore()
@@ -132,7 +162,7 @@ public function testGetCartWithWrongStore()
      * @magentoApiDataFixture Magento/Customer/_files/customer.php
      * @magentoApiDataFixture Magento/Checkout/_files/active_quote_guest_not_default_store.php
      *
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Requested store is not found
      */
     public function testGetCartWithNotExistingStore()
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/PlaceOrderTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/PlaceOrderTest.php
index 30ad69eada29d..828bddcadebcb 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/PlaceOrderTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/PlaceOrderTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Guest;
 
+use Exception;
 use Magento\Framework\Registry;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\Sales\Api\OrderRepositoryInterface;
@@ -76,6 +77,37 @@ public function testPlaceOrder()
         self::assertEquals($reservedOrderId, $response['placeOrder']['order']['order_id']);
     }
 
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testPlaceOrderIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testPlaceOrderIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  placeOrder(input: {}) {
+    order {
+      order_id
+    }
+  }
+}
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
     /**
      * @magentoApiDataFixture Magento/GraphQl/Catalog/_files/simple_product.php
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/enable_offline_shipping_methods.php
diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveCouponFromCartTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveCouponFromCartTest.php
index 5adb6ce65db6f..57a13e2f1bc03 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveCouponFromCartTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Quote/Guest/RemoveCouponFromCartTest.php
@@ -7,6 +7,7 @@
 
 namespace Magento\GraphQl\Quote\Guest;
 
+use Exception;
 use Magento\GraphQl\Quote\GetMaskedQuoteIdByReservedOrderId;
 use Magento\TestFramework\Helper\Bootstrap;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
@@ -49,7 +50,41 @@ public function testRemoveCouponFromCart()
     }
 
     /**
-     * @expectedException \Exception
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testRemoveCouponFromCartIfCartIdIsEmpty()
+    {
+        $maskedQuoteId = '';
+        $query = $this->getQuery($maskedQuoteId);
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Required parameter "cart_id" is missing
+     */
+    public function testRemoveCouponFromCartIfCartIdIsMissed()
+    {
+        $query = <<<QUERY
+mutation {
+  removeCouponFromCart(input: {}) {
+    cart {
+      applied_coupon {
+        code
+      }
+    }
+  }
+}
+
+QUERY;
+
+        $this->graphQlMutation($query);
+    }
+
+    /**
+     * @expectedException Exception
      * @expectedExceptionMessage Could not find a cart with ID "non_existent_masked_id"
      */
     public function testRemoveCouponFromNonExistentCart()
@@ -62,7 +97,7 @@ public function testRemoveCouponFromNonExistentCart()
 
     /**
      * @magentoApiDataFixture Magento/GraphQl/Quote/_files/guest/create_empty_cart.php
-     * @expectedException \Exception
+     * @expectedException Exception
      * @expectedExceptionMessage Cart does not contain products
      */
     public function testRemoveCouponFromEmptyCart()