stripe-ruby-mock Tests

REQUEST: Looking for More Core Contributors

This gem has unexpectedly grown in popularity and I've gotten pretty busy, so I'm currently looking for more core contributors to help me out. If you're interested, there is only one requirement: submit a significant enough pull request and have it merged into master (many of you have already done this). Afterwards, ping @gilbert in chat and I will add you as a collaborator.

Install

In your gemfile:

gem 'stripe-ruby-mock', :require => 'stripe_mock'

!!! Important

We have changelog. It's first attempt. Feel free to update it and suggest to a new format of it.

version 3.0.0 has breaking changes - we support stripe > 5 and < 6 for now and try to follow the newest API version. But if you still use older versions please read.

Features

  • No stripe server access required
  • Easily test against stripe errors
  • Mock and customize stripe webhooks
  • Flip a switch to run your tests against Stripe's live test servers

Requirements

  • ruby >= 2.7.0
  • stripe > 5 & < 11

Specifications

STRIPE API TARGET VERSION: 2019-08-20 (master) - we try, but some features are not implemented yet.

Older API version branches:

Versioning System

Since StripeMock tries to keep up with Stripe's API version, its version system is a little different:

  • The major number (1.x.x) is for breaking changes involving how you use StripeMock itself
  • The minor number (x.1.x) is for breaking changes involving Stripe's API
  • The patch number (x.x.0) is for non-breaking changes/fixes involving Stripe's API, or for non-breaking changes/fixes/features for StripeMock itself.

Description

** WARNING: This library does not cover all Stripe API endpoints. If you need one that's missing, please create an issue for it, or see this wiki page if you're interested in contributing **

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
  let(:stripe_helper) { StripeMock.create_test_helper }
  before { StripeMock.start }
  after { StripeMock.stop }

  it "creates a stripe customer" do

    # This doesn't touch stripe's servers nor the internet!
    # Specify :source in place of :card (with same value) to return customer with source data
    customer = Stripe::Customer.create({
      email: '[email protected]',
      source: stripe_helper.generate_card_token
    })
    expect(customer.email).to eq('[email protected]')
  end
end

Test Helpers

Some Stripe API calls require several parameters. StripeMock helps you keep your test brief with some helpers:

describe MyApp do
  let(:stripe_helper) { StripeMock.create_test_helper }

  it "creates a stripe plan" do
    plan = stripe_helper.create_plan(:id => 'my_plan', :amount => 1500)

    # The above line replaces the following:
    # plan = Stripe::Plan.create(
    #   :id => 'my_plan',
    #   :name => 'StripeMock Default Plan ID',
    #   :amount => 1500,
    #   :currency => 'usd',
    #   :interval => 'month'
    # )
    expect(plan.id).to eq('my_plan')
    expect(plan.amount).to eq(1500)
  end
end

The available helpers are:

stripe_helper.create_plan(my_plan_params)
stripe_helper.delete_plan(my_plan_params)
stripe_helper.generate_card_token(my_card_params)

For everything else, use Stripe as you normally would (i.e. use Stripe as if you were not using StripeMock).

Live Testing

Every once in a while you want to make sure your tests are actually valid. StripeMock has a switch that allows you to run your test suite (or a subset thereof) against Stripe's live test servers.

Here is an example of setting up your RSpec (2.x) test suite to run live with a command line switch:

# RSpec 2.x
RSpec.configure do |c|
  if c.filter_manager.inclusions.keys.include?(:live)
    StripeMock.toggle_live(true)
    puts "Running **live** tests against Stripe..."
  end
end

With this you can run live tests by running rspec -t live

Here is an example of setting up your RSpec (3.x) test suite to run live with the same command line switch:

# RSpec 3.x
RSpec.configure do |c|
  if c.filter_manager.inclusions.rules.include?(:live)
    StripeMock.toggle_live(true)
    puts "Running **live** tests against Stripe..."
  end
end

Mocking Card Errors

** Ensure you start StripeMock in a before filter StripeMock.start 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(amount: 1, currency: 'usd') }.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)
StripeMock.prepare_card_error(:incorrect_zip)

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

Specifying Card Errors

** Ensure you start StripeMock in a before filter StripeMock.start By default, prepare_card_error only triggers for :new_charge, the event that happens when you run Charge.create. More explicitly, this is what happens by default:

StripeMock.prepare_card_error(:card_declined, :new_charge)

If you want the error to trigger on a different event, you need to replace :new_charge with a different event. For example:

StripeMock.prepare_card_error(:card_declined, :create_card)
customer = Stripe::Customer.create
# This line throws the card error
customer.cards.create

:new_charge and :create_card are names of methods in the StripeMock request handlers. You can also set StripeMock.toggle_debug(true) to see the event name for each Stripe request made in your tests.

Custom Errors

** Ensure you start StripeMock in a before filter StripeMock.start 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(amount: 1, currency: 'usd') }.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.default_card).to_not be_nil
  # etc.
end

it "mocks stripe connect webhooks" do
  event = StripeMock.mock_webhook_event('customer.created', account: 'acc_123123')

  expect(event.).to eq('acc_123123')
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.

For example, you could create a file in spec/fixtures/stripe_webhooks/invoice.created.with-sub.json, copy/paste the default from the default invoice.created.json, and customize it to your needs.

Then you can use that webook directly in your specs:

it "can use a custom webhook fixture" do
  event = StripeMock.mock_webhook_event('invoice.created.with-sub')
  # etc.
end

You can alse override values on the fly:

it "can override 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 => '[email protected]'
  })
  # Alternatively:
  # event.data.object.id = 'cus_my_custom_value'
  # event.data.object.email = '[email protected]'
  expect(event.data.object.id).to eq('cus_my_custom_value')
  expect(event.data.object.email).to eq('[email protected]')
end

You can name events whatever you like in your spec/fixtures/stripe_webhooks/ folder. However, if you try to call a non-standard event that's doesn't exist 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/'

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(source: card_token)
  card = cus.sources.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.

Miscellaneous Features

You may have noticed that all generated Stripe ids start with test_. If you want to remove this:

# Turns off test_ prefix
StripeMock.global_id_prefix = false

# Or you can set your own
StripeMock.global_id_prefix = 'my_app_'

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
  • Fingerprinting for other resources besides Cards

Developing stripe-ruby-mock

Please see this wiki page

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.

Note: You may need to ulimit -n 4048 before running the test suite to get all tests to pass.

Copyright (c) 2013 Gilbert

See LICENSE.txt for details.