GraphQL-129: Change resolve to return array, update schema and test

Author: pfantini

app/code/Magento/CustomerGraphQl/Model/Resolver/Customer/Account/GenerateCustomerToken.php

@@ -16,9 +16,11 @@
 use Magento\Framework\GraphQl\Query\ResolverInterface;
 use Magento\Framework\GraphQl\Schema\Type\ResolveInfo;
 
+/**
+ * Customers Token resolver, used for GraphQL request processing.
+ */
 class GenerateCustomerToken implements ResolverInterface
 {
-
     /**
      * @var CustomerTokenServiceInterface
      */
@@ -54,7 +56,7 @@ public function resolve(
         try {
             $token = $this->customerTokenService->createCustomerAccessToken($args['email'], $args['password']);
             $result = function () use ($token) {
-                return !empty($token) ? $token : '';
+                return !empty($token) ? ['token' => $token] : '';
             };
             return $this->valueFactory->create($result);
         } catch (AuthenticationException $e) {

app/code/Magento/CustomerGraphQl/etc/schema.graphqls

@@ -6,7 +6,11 @@ type Query {
 }
 
 type Mutation {
-    generateCustomerToken(email: String!, password: String!): String! @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\Customer\\Account\\GenerateCustomerToken") @doc(description:"Retrieve Customer token")
+    generateCustomerToken(email: String!, password: String!): CustomerToken @resolver(class: "\\Magento\\CustomerGraphQl\\Model\\Resolver\\Customer\\Account\\GenerateCustomerToken") @doc(description:"Retrieve Customer token")
+}
+
+type CustomerToken {
+    token: String @doc(description: "The new customer token")
 }
 
 type Customer @doc(description: "Customer defines the customer name and address and other details") {

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

@@ -8,10 +8,14 @@
 namespace Magento\GraphQl\Customer;
 
 use Magento\TestFramework\TestCase\GraphQlAbstract;
+use PHPUnit\Framework\TestResult;
 
+/**
+ * Class GenerateCustomerTokenTest
+ * @package Magento\GraphQl\Customer
+ */
 class GenerateCustomerTokenTest extends GraphQlAbstract
 {
-
     /**
      * Verify customer token with valid credentials
      *
@@ -29,13 +33,15 @@ public function testGenerateCustomerValidToken()
 	generateCustomerToken(
         email: "{$userName}"
         password: "{$password}"
-    )
+    ) {
+        token
+    }
 }
 MUTATION;
 
         $response = $this->graphQlQuery($mutation);
         $this->assertArrayHasKey('generateCustomerToken', $response);
-        $this->assertInternalType('string', $response['generateCustomerToken']);
+        $this->assertInternalType('array', $response['generateCustomerToken']);
     }
 
     /**
@@ -54,7 +60,9 @@ public function testGenerateCustomerTokenWithInvalidCredentials()
 	generateCustomerToken(
         email: "{$userName}"
         password: "{$password}"
-    )
+    ) {
+        token
+    }
 }
 MUTATION;