NodeJS source (edit on github)

If you see a problem with the source submit a pull request on Github.

const stripeCache = require('../../../../stripe-cache.js')

module.exports = {
  get: async (req) => {
    if (!req.query || !req.query.subscriptionid) {
      throw new Error('invalid-subscriptionid')
    }
    const subscription = await global.api.user.subscriptions.Subscription.get(req)
    const invoice = await stripeCache.execute('invoices', 'retrieveUpcoming', {
      customer: subscription.customer.id || subscription.customer,
      subscription: req.query.subscriptionid
    }, req.stripeKey)
    if (!invoice) {
      throw new Error('invalid-subscriptionid')
    }
    return invoice
  }
}

Test source (edit on github)

Tests perform real HTTP requests against a running Dashboard server.

/* eslint-env mocha */
const assert = require('assert')
const TestHelper = require('../../../../../test-helper.js')
const TestStripeAccounts = require('../../../../../test-stripe-accounts.js')

describe('/api/user/subscriptions/upcoming-invoice', function () {
  this.timeout(0 * 60 * 1000)
  beforeEach(TestHelper.setupWebhook)
  afterEach(TestHelper.deleteOldWebhooks)
  describe('exceptions', () => {
    describe('invalid-subscriptionid', () => {
      it('missing querystring subscriptionid', async () => {
        const user = await TestHelper.createUser()
        const req = TestHelper.createRequest('/api/user/subscriptions/upcoming-invoice')
        req.account = user.account
        req.session = user.session
        let errorMessage
        try {
          await req.get()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-subscriptionid')
      })

      it('invalid querystring subscriptionid', async () => {
        const user = await TestHelper.createUser()
        const req = TestHelper.createRequest('/api/user/subscriptions/upcoming-invoice?subscriptionid=invalid')
        req.account = user.account
        req.session = user.session
        let errorMessage
        try {
          await req.get()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-subscriptionid')
      })
    })

    describe('invalid-account', () => {
      it('ineligible accessing account', async () => {
        const administrator = await TestStripeAccounts.createOwnerWithPlan()
        const user = await TestStripeAccounts.createUserWithPaymentMethod()
        await TestHelper.createSubscription(user, administrator.plan.id)
        const user2 = await TestStripeAccounts.createUserWithPaymentMethod()
        await TestHelper.createSubscription(user2, administrator.plan.id)
        const req = TestHelper.createRequest(`/api/user/subscriptions/upcoming-invoice?subscriptionid=${user.subscription.id}`)
        req.account = user2.account
        req.session = user2.session
        let errorMessage
        try {
          await req.get()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-account')
      })
    })

    describe('invalid-subscription', () => {
      it('ineligible querystring subscription', async () => {
        const administrator = await TestStripeAccounts.createOwnerWithPlan()
        const user = await TestStripeAccounts.createUserWithPaymentMethod()
        await TestHelper.createSubscription(user, administrator.plan.id)
        const user2 = await TestStripeAccounts.createUserWithPaymentMethod()
        await TestHelper.createSubscription(user2, administrator.plan.id)
        const req = TestHelper.createRequest(`/api/user/subscriptions/upcoming-invoice?subscriptionid=${user.subscription.id}`)
        req.account = user2.account
        req.session = user2.session
        let errorMessage
        try {
          await req.get()
        } catch (error) {
          errorMessage = error.message
        }
        assert.strictEqual(errorMessage, 'invalid-account')
      })
    })
  })

  describe('returns', () => {
    it('object', async () => {
      const administrator = await TestStripeAccounts.createOwnerWithPlan()
      const user = await TestStripeAccounts.createUserWithPaymentMethod()
      await TestHelper.createSubscription(user, administrator.plan.id)
      const req = TestHelper.createRequest(`/api/user/subscriptions/upcoming-invoice?subscriptionid=${user.subscription.id}`)
      req.account = user.account
      req.session = user.session
      req.filename = __filename
      req.saveResponse = true
      const invoice = await req.get()
      assert.strictEqual(invoice.total, administrator.plan.amount)
    })
  })
})