Nested test mutation

test.graphql

# One Subpage.
mutation {
  createPage(data: {title:"Vincenzo", subpages: {create:{title:"Russo"}}}) {
    id
    title
    subpages {
      id
      title      
    }
  }
}

# One Subpage which also has another subpage.
mutation {
  createPage(data: {title:"Page X", subpages: {create:{title:"Page Y", subpages: {create:{title: "Page Z"}}}}}) {
    id
    title
    subpages {
      id
      title
      subpages {
        id
        title
      }
    }
  }
}

# Two Subpages.
mutation {
  createPage(data: {title:"Yet", subpages: {create:[{title:"One more"}, {title:"And another"}]}}) {
    id
    title
    subpages {
      id
      title      
    }
  }
}