Can generate a transaction with no args.

README.md

@@ -90,7 +90,8 @@ It takes the following options:
 * `:amount`: the amount of the transaction
 * `:status`: the status of the transaction, e.g. `Braintree::Transaction::Status::Failed`
 
-Any or all of these can be nil, and in fact are nil by default.
+Any or all of these can be nil, and in fact are nil by default. You can also
+call it with no arguments.
 
 Full example:
 

lib/fake_braintree.rb

@@ -99,7 +99,7 @@ def self.credit_card_from_token(token)
     end
   end
 
-  def self.generate_transaction(options)
+  def self.generate_transaction(options = {})
     history_item = { 'timestamp'       => Time.now,
                      'amount'          => options[:amount],
                      'status'          => options[:status] }

spec/fake_braintree_spec.rb

@@ -112,6 +112,10 @@ def write_to_log
     transaction['subscription_id'].should == 'foobar'
   end
 
+  it "allows no arguments" do
+    expect { FakeBraintree.generate_transaction }.not_to raise_error
+  end
+
   context "status_history" do
     it "returns a hash with a status_history key" do
       FakeBraintree.generate_transaction(:amount => '20').should have_key('status_history')