Test nonces don't work?

not sure what I’m doing wrong here, but I’m in a sandbox environment using nonce='fake-valid-nonce' here:

    resp = braintree.Subscription.create({
        'payment_method_nonce': nonce,
        'plan_id': config.BRAINTREE_SUBSCRIPTION_PLAN_ID
    })

and keep getting the error “Payment method nonce is invalid.”

[amandapouget]

I found the solution to my problem by using the nonce_for_new_payment_method available from this spec helper, included with the Braintree gem: https://github.com/braintree/braintree_ruby/blob/master/spec/integration/braintree/client_api/spec_helper.rb

Recording this here in case anyone else is writing a Ruby controller test involving a Braintree::Subscription.

Here is my working example:

describe 'POST #create (success)' do
    let(:organization) { create(:organization) }
    let(:valid_card) do
      {
        number: "4111111111111111",
        expiration_month: "11",
        expiration_year: "2099"
      }
    end
    let(:nonce) do
      organization.update(
        braintree_customer_id: Braintree::Customer.create(company: organization.name).customer.id
      )
      nonce_for_new_payment_method(
       credit_card: valid_card,
       client_token_options: {customer_id: organization.braintree_customer_id}
     )
    end

    describe 'in Braintree' do
      it 'creates a BraintreeSubscription tied to our organization' do
        params = { payment_method_nonce: nonce, plan_id: 'monthly-recurring' }
        post :create, params: params
.....
           // in Controller...
           nonce_from_the_client = params[:payment_method_nonce]
           result = Braintree::Subscription.create(
             payment_method_nonce: nonce_from_the_client,
             plan_id: params[:plan_id]
           )
           result.success? // ...is true

Recommend updating this documentation page, which errantly suggests that the fake valid nonces can be using for recurring billing: https://developers.braintreepayments.com/guides/recurring-billing/testing-go-live/ruby

[EvanHahn]

Our fake nonces are effectively one-time-use, but subscription calls need a payment method that they can hit periodically.

Subscription.create() calls will only accept a nonce if it is directly tied to a payment method in your Vault. You can generate a nonce like this by using PaymentMethodNonce.create() and passing it a token from your Vault. For example:

nonce_create = braintree.PaymentMethodNonce.create('A_PAYMENT_METHOD_TOKEN')
nonce = nonce_create.payment_method_nonce.nonce

resp = braintree.Subscription.create({
    'payment_method_nonce': nonce,
    'plan_id': config.BRAINTREE_SUBSCRIPTION_PLAN_ID
})

This shouldn’t affect you in production because you’ll never use fake nonces.