Allow overwriting of the default currency

In my application, when we create customers, we aren't specifying the
currency. Stripe's documentation for "Create a customer" doesn't state
that you can specify a currency, so I'm guessing that it is somehow
inferred.

As my application does not use USD, the check for matching currencies
that was added in 0bb51d1 broke my
tests.

Allowing to specify a default currency other than usd seemed like the
most straightforward approach to get this working.

I couldn't figure out a good approach to get it to work for the server
spec, as I can't easily overwrite the default for the server (as the
server is started once before all the specs). It should still work
though even if you are using the server. Due to my change having little
chance of introducing a regression, I decided to only make a spec for
the instance version.

lib/stripe_mock.rb

@@ -74,11 +74,13 @@
 
 module StripeMock
 
+  @default_currency = 'usd'
   lib_dir = File.expand_path(File.dirname(__FILE__), '../..')
   @webhook_fixture_path = './spec/fixtures/stripe_webhooks/'
   @webhook_fixture_fallback_path = File.join(lib_dir, 'stripe_mock/webhook_fixtures')
 
   class << self
+    attr_accessor :default_currency
     attr_accessor :webhook_fixture_path
   end
 end

lib/stripe_mock/data.rb

@@ -3,7 +3,7 @@ module Data
 
     def self.mock_account(params = {})
       id = params[:id] || 'acct_103ED82ePvKYlo2C'
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: id,
         email: "bob@example.com",
@@ -103,7 +103,8 @@ def self.mock_account(params = {})
 
     def self.mock_customer(sources, params)
       cus_id = params[:id] || "test_cus_default"
-      currency = params[:currency] || 'usd'
+      puts @default_currency
+      currency = params[:currency] || StripeMock.default_currency
       sources.each {|source| source[:customer] = cus_id}
       {
         email: 'stripe_mock@example.com',
@@ -134,7 +135,7 @@ def self.mock_customer(sources, params)
 
     def self.mock_charge(params={})
       charge_id = params[:id] || "ch_1fD6uiR9FAA2zc"
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: charge_id,
         object: "charge",
@@ -196,7 +197,7 @@ def self.mock_charge(params={})
     end
 
     def self.mock_refund(params={})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: "re_4fWhgUh5si7InF",
         amount: 1,
@@ -248,7 +249,7 @@ def self.mock_card(params={})
     end
 
     def self.mock_bank_account(params={})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: "test_ba_default",
         object: "bank_account",
@@ -306,7 +307,7 @@ def self.mock_subscription(params={})
             plan: {
               amount: 999,
               created: 1504035972,
-              currency: 'usd'
+              currency: StripeMock.default_currency
             },
             quantity: 1
           }]
@@ -328,7 +329,7 @@ def self.mock_subscription(params={})
 
     def self.mock_invoice(lines, params={})
       in_id = params[:id] || "test_in_default"
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       lines << Data.mock_line_item() if lines.empty?
       invoice = {
         id: 'in_test_invoice',
@@ -379,7 +380,7 @@ def self.mock_invoice(lines, params={})
     end
 
     def self.mock_line_item(params = {})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: "ii_test",
         object: "line_item",
@@ -402,7 +403,7 @@ def self.mock_line_item(params = {})
     end
 
     def self.mock_invoice_item(params = {})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: "test_ii",
         object: "invoiceitem",
@@ -490,7 +491,7 @@ def self.mock_order_item(params={})
     end
 
     def self.mock_plan(params={})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       {
         id: "2",
         object: "plan",
@@ -591,7 +592,7 @@ def self.mock_bank_account_token(params={})
     end
 
     def self.mock_transfer(params={})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       id = params[:id] || 'tr_test_transfer'
       {
         :status => 'pending',
@@ -623,7 +624,7 @@ def self.mock_transfer(params={})
     end
 
     def self.mock_payout(params={})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       id = params[:id] || 'po_test_payout'
       {
         :amount => 100,
@@ -647,7 +648,7 @@ def self.mock_disputes(ids=[])
 
     def self.mock_dispute(params={})
       @timestamp ||= Time.now.to_i
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       id = params[:id] || "dp_test_dispute"
       {
         :id => id,
@@ -967,7 +968,7 @@ def self.mock_balance_transactions(ids=[])
     end
 
     def self.mock_balance_transaction(params = {})
-      currency = params[:currency] || 'usd'
+      currency = params[:currency] || StripeMock.default_currency
       bt_id = params[:id] || 'test_txn_default'
       source = params[:source] || 'ch_test_charge'
       {
@@ -1015,7 +1016,7 @@ def self.mock_subscription_item(params = {})
           object: 'plan',
           amount: 1337,
           created: 1504716177,
-          currency: 'usd',
+          currency: StripeMock.default_currency,
           interval: 'month',
           interval_count: 1,
           livemode: false,

lib/stripe_mock/request_handlers/invoices.rb

@@ -166,9 +166,9 @@ def get_mock_subscription_line_item(subscription)
       #anonymous charge
       def invoice_charge(invoice)
         begin
-          new_charge(nil, nil, {customer: invoice[:customer]["id"], amount: invoice[:amount_due], currency: 'usd'}, nil)
+          new_charge(nil, nil, {customer: invoice[:customer]["id"], amount: invoice[:amount_due], currency: StripeMock.default_currency}, nil)
         rescue Stripe::InvalidRequestError
-          new_charge(nil, nil, {source: generate_card_token, amount: invoice[:amount_due], currency: 'usd'}, nil)
+          new_charge(nil, nil, {source: generate_card_token, amount: invoice[:amount_due], currency: StripeMock.default_currency}, nil)
         end
       end
 

lib/stripe_mock/test_strategies/base.rb

@@ -3,7 +3,7 @@ module TestStrategies
     class Base
 
       def create_plan_params(params={})
-        currency = params[:currency] || 'usd'
+        currency = params[:currency] || StripeMock.default_currency
         {
           :id => 'stripe_mock_default_plan_id',
           :name => 'StripeMock Default Plan ID',
@@ -23,7 +23,7 @@ def generate_card_token(card_params={})
       end
 
       def generate_bank_token(bank_account_params={})
-        currency = bank_account_params[:currency] || 'usd'
+        currency = bank_account_params[:currency] || StripeMock.default_currency
         bank_account = {
           :country => "US",
           :currency => currency,
@@ -39,7 +39,7 @@ def generate_bank_token(bank_account_params={})
       end
 
       def create_coupon_params(params = {})
-        currency = params[:currency] || 'usd'
+        currency = params[:currency] || StripeMock.default_currency
         {
           id: '10BUCKS',
           amount_off: 1000,

spec/instance_spec.rb

@@ -52,4 +52,18 @@ def test_data_source(type); StripeMock.instance.send(type); end
     StripeMock.set_conversion_rate(1.25)
     expect(StripeMock.instance.conversion_rate).to eq(1.25)
   end
+
+  it "allows non-usd default currency" do
+    old_default_currency = StripeMock.default_currency
+    customer = begin
+      StripeMock.default_currency = "jpy"
+      Stripe::Customer.create({
+        email: 'johnny@appleseed.com',
+        source: stripe_helper.generate_card_token
+      })
+    ensure
+      StripeMock.default_currency = old_default_currency
+    end
+    expect(customer.currency).to eq("jpy")
+  end
 end