Add a test for a mutation with a subresource

Author: alanpoulain

features/graphql/mutation.feature

@@ -54,11 +54,36 @@ Feature: GraphQL mutation support
     And the JSON node "data.createFoo.bar" should be equal to "new"
     And the JSON node "data.createFoo.clientMutationId" should be equal to "myId"
 
+  Scenario: Create an item with a subresource
+    Given there are 1 dummy objects with relatedDummy
+    When I send the following GraphQL request:
+    """
+    mutation {
+      createDummy(input: {_id: 1, name: "A dummy", foo: [], relatedDummy: "/related_dummies/1", clientMutationId: "myId"}) {
+        id
+        name
+        foo
+        relatedDummy {
+          name
+        }
+        clientMutationId
+      }
+    }
+    """
+    Then the response status code should be 200
+    And the response should be in JSON
+    And the header "Content-Type" should be equal to "application/json"
+    And the JSON node "data.createDummy.id" should be equal to "/dummies/2"
+    And the JSON node "data.createDummy.name" should be equal to "A dummy"
+    And the JSON node "data.createDummy.foo" should have 0 elements
+    And the JSON node "data.createDummy.relatedDummy.name" should be equal to "RelatedDummy #1"
+    And the JSON node "data.createDummy.clientMutationId" should be equal to "myId"
+
   Scenario: Create an item with an iterable field
     When I send the following GraphQL request:
     """
     mutation {
-      createDummy(input: {_id: 1, name: "A dummy", foo: [], jsonData: {bar:{baz:3,qux:[7.6,false,null]}}, clientMutationId: "myId"}) {
+      createDummy(input: {_id: 2, name: "A dummy", foo: [], jsonData: {bar:{baz:3,qux:[7.6,false,null]}}, clientMutationId: "myId"}) {
         id
         name
         foo
@@ -70,7 +95,7 @@ Feature: GraphQL mutation support
     Then the response status code should be 200
     And the response should be in JSON
     And the header "Content-Type" should be equal to "application/json"
-    And the JSON node "data.createDummy.id" should be equal to "/dummies/1"
+    And the JSON node "data.createDummy.id" should be equal to "/dummies/3"
     And the JSON node "data.createDummy.name" should be equal to "A dummy"
     And the JSON node "data.createDummy.foo" should have 0 elements
     And the JSON node "data.createDummy.jsonData.bar.baz" should be equal to the number 3