Test subscriptionContracts on development stores

[WinkyApps]

I have created a test subscription through a graphql mutations suggested in the documentation along with "test=true" parameter. 

mutation {
  appSubscriptionCreate(
    name: "Super Deluxe Recurring Plan"
    test: true,
    returnUrl: "http://super-duper.shopifyapps.com"
    lineItems: [{
      plan: {
        appRecurringPricingDetails: {
          price: { amount: 1.00, currencyCode: USD }
          interval: EVERY_30_DAYS
        }
      }
    }]
  ) {
    userErrors {
      field
      message
    }
    confirmationUrl
    appSubscription {
      id
    }
  }
}

When I query subscriptionContracts the response is empty. I do not see the created subscription on the response. How do you confirm the charge IDs from the return url? It doesn't work on test transactions?

query {
  subscriptionContracts(first: 10) {
    edges {
      node {
        id
        createdAt
        status
        nextBillingDate
        customer {
          firstName
          lastName
        }
        billingPolicy {
          interval
          intervalCount
        }
      }
    }
  }
}