From fe89ce4bd0e60cbc9fdfe8044602fa0de72ea7ad Mon Sep 17 00:00:00 2001
From: Alex Taranovsky <firster@atwix.com>
Date: Mon, 11 Nov 2019 00:10:58 +0200
Subject: [PATCH] magento/devdocs#: createCustomer. Test coverage. Case: create
 new customer with the email of already existent user

---
 .../GraphQl/Customer/CreateCustomerTest.php   | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php b/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
index 0be968d6d340d..85e5a0dae11e2 100644
--- a/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
+++ b/dev/tests/api-functional/testsuite/Magento/GraphQl/Customer/CreateCustomerTest.php
@@ -308,6 +308,39 @@ public function testCreateCustomerSubscribed()
         $this->assertEquals(false, $response['createCustomer']['customer']['is_subscribed']);
     }
 
+    /**
+     * @magentoApiDataFixture Magento/Customer/_files/customer.php
+     * @expectedException \Exception
+     * @expectedExceptionMessage A customer with the same email address already exists in an associated website.
+     */
+    public function testCreateCustomerIfCustomerWithProvidedEmailAlreadyExists()
+    {
+        $existedEmail = 'customer@example.com';
+        $password = 'test123#';
+        $firstname = 'John';
+        $lastname = 'Smith';
+
+        $query = <<<QUERY
+mutation {
+    createCustomer(
+        input: {
+            email: "{$existedEmail}"
+            password: "{$password}"
+            firstname: "{$firstname}"
+            lastname: "{$lastname}"
+        }
+    ) {
+        customer {
+            firstname
+            lastname
+            email
+        }
+    }
+}
+QUERY;
+        $this->graphQlMutation($query);
+    }
+
     public function tearDown()
     {
         $newEmail = 'new_customer@example.com';