mustwin-stripe-ruby-mock

stripe-ruby-mock

• Homepage: https://github.com/rebelidealist/stripe-ruby-mock
• Issues: https://github.com/rebelidealist/stripe-ruby-mock/issues

Install

In your gemfile:

gem 'stripe-ruby-mock', '>= 1.8.4.9'

Features

• No stripe server access required
• Easily test against stripe errors
• Mock and customize stripe webhooks

Description

** WARNING: This library does not cover all Stripe API endpoints. If you need one that's missing, please create an issue for it. **

At its core, this library overrides stripe-ruby's request method to skip all http calls and instead directly return test data. This allows you to write and run tests without the need to actually hit stripe's servers.

You can use stripe-ruby-mock with any ruby testing library. Here's a quick dummy example with RSpec:

require 'stripe_mock'

describe MyApp do
  before { StripeMock.start }
  after { StripeMock.stop }

  it "creates a stripe customer" do

    # This doesn't touch stripe's servers nor the internet!
    customer = Stripe::Customer.create({
      email: '[e-mail]',
      card: 'void_card_token'
    })
    expect(customer.email).to eq('[e-mail]')
  end
end

Mocking Card Errors

Tired of manually inputting fake credit card numbers to test against errors? Tire no more!

it "mocks a declined card error" do
  # Prepares an error for the next create charge request
  StripeMock.prepare_card_error(:card_declined)

  expect { Stripe::Charge.create }.to raise_error {|e|
    expect(e).to be_a Stripe::CardError
    expect(e.http_status).to eq(402)
    expect(e.code).to eq('card_declined')
  }
end

Built-In Card Errors

StripeMock.prepare_card_error(:incorrect_number)
StripeMock.prepare_card_error(:invalid_number)
StripeMock.prepare_card_error(:invalid_expiry_month)
StripeMock.prepare_card_error(:invalid_expiry_year)
StripeMock.prepare_card_error(:invalid_cvc)
StripeMock.prepare_card_error(:expired_card)
StripeMock.prepare_card_error(:incorrect_cvc)
StripeMock.prepare_card_error(:card_declined)
StripeMock.prepare_card_error(:missing)
StripeMock.prepare_card_error(:processing_error)

You can see the details of each error in lib/stripe_mock/api/errors.rb

Custom Errors

To raise an error on a specific type of request, take a look at the request handlers folder and pass a method name to StripeMock.prepare_error.

If you wanted to raise an error for creating a new customer, for instance, you would do the following:

it "raises a custom error for specific actions" do
  custom_error = StandardError.new("Please knock first.")

  StripeMock.prepare_error(custom_error, :new_customer)

  expect { Stripe::Charge.create }.to_not raise_error
  expect { Stripe::Customer.create }.to raise_error {|e|
    expect(e).to be_a StandardError
    expect(e.message).to eq("Please knock first.")
  }
end

In the above example, :new_customer is the name of a method from customers.rb.

Running the Mock Server

Sometimes you want your test stripe data to persist for a bit, such as during integration tests running on different processes. In such cases you'll want to start the stripe mock server:

# spec_helper.rb
#
# The mock server will automatically be killed when your tests are done running.
#
require 'thin'
StripeMock.spawn_server

Then, instead of StripeMock.start, you'll want to use StripeMock.start_client:

describe MyApp do
  before do
    @client = StripeMock.start_client
  end

  after do
    StripeMock.stop_client
    # Alternatively:
    #   @client.close!
    # -- Or --
    #   StripeMock.stop_client(:clear_server_data => true)
  end
end

This is all essentially the same as using StripeMock.start, except that the stripe test data is held in its own server process.

Here are some other neat things you can do with the client:

@client.state #=> 'ready'

@client.get_server_data(:customers) # Also works for :charges, :plans, etc.
@client.clear_server_data

@client.close!
@client.state #=> 'closed'

Mock Server Options

# NOTE: Shown below are the default options
StripeMock.default_server_pid_path = './stripe-mock-server.pid'

StripeMock.spawn_server(
  :pid_path => StripeMock.default_server_pid_path,
  :host => '0.0.0.0',
  :port => 4999,
  :server => :thin
)

StripeMock.kill_server(StripeMock.default_server_pid_path)

Mock Server Command

If you need the mock server to continue running even after your tests are done, you'll want to use the executable:

$ stripe-mock-server -p 4000
$ stripe-mock-server --help

Mocking Webhooks

If your application handles stripe webhooks, you are most likely retrieving the event from stripe and passing the result to a handler. StripeMock helps you by easily mocking that event:

it "mocks a stripe webhook" do
  event = StripeMock.mock_webhook_event('customer.created')

  customer_object = event.data.object
  expect(customer_object.id).to_not be_nil
  expect(customer_object.active_card).to_not be_nil
  # etc.
end

Customizing Webhooks

By default, StripeMock searches in your spec/fixtures/stripe_webhooks/ folder for your own, custom webhooks. If it finds nothing, it falls back to test events generated through stripe's webhooktester.

You can name events whatever you like in your spec/fixtures/stripe_webhooks/ folder. However, if you try to call a non-existant event that's not in that folder, StripeMock will throw an error.

If you wish to use a different fixture path, you can set it yourself:

StripeMock.webhook_fixture_path = './spec/other/folder/'

Also, you can override values whenever you create any webhook event:

it "can override default webhook values" do
  # NOTE: given hash values get merged directly into event.data.object
  event = StripeMock.mock_webhook_event('customer.created', {
    :id => 'cus_my_custom_value',
    :email => '[e-mail]'
  })
  # Alternatively:
  # event.data.object.id = 'cus_my_custom_value'
  # event.data.object.email = '[e-mail]'
  expect(event.data.object.id).to eq('cus_my_custom_value')
  expect(event.data.object.email).to eq('[e-mail]')
end

Generating Card Tokens

Sometimes you need to check if your code reads a stripe card correctly. If so, you can specifically assign card data to a generated card token:

it "generates a stripe card token" do
  card_token = StripeMock.generate_card_token(last4: "9191", exp_year: 1984)

  cus = Stripe::Customer.create(card: card_token)
  card = cus.cards.data.first
  expect(card.last4).to eq("9191")
  expect(card.exp_year).to eq(1984)
end

Debugging

To enable debug messages:

StripeMock.toggle_debug(true)

This will only last for the session; Once you call StripeMock.stop or StripeMock.stop_client, debug will be toggled off.

If you always want debug to be on (it's quite verbose), you should put this in a before block.

TODO

• Cover all stripe urls/methods
• Throw useful errors that emulate Stripe's requirements
  • For example: "You must supply either a card or a customer id" for Stripe::Charge

Developing stripe-ruby-mock

To run the tests:

$ rspec

Patches are welcome and greatly appreciated! If you're contributing to fix a problem, be sure to write tests that illustrate the problem being fixed. This will help ensure that the problem remains fixed in future updates.

Copyright

Copyright (c) 2013 Gilbert

See LICENSE.txt for details.