add transaction controller spec

spec/controllers/transactions_controller_spec.rb

@@ -1,5 +1,21 @@
 require 'rails_helper'
 
 RSpec.describe TransactionsController, type: :controller do
-
+  describe "creating transaction" do
+    before :each do
+      @debtor = create(:user)
+      @creditor = create(:user)
+      sign_in @debtor
+    end
+
+    it "should create a valid transaction" do
+      expect do
+        put :create, { transaction: {
+          creditor: @creditor.name,
+          amount: 20,
+          message: "hoi"
+        }}
+      end.to change {Transaction.count}.by(1)
+    end
+  end
 end

spec/spec_helper.rb

@@ -17,8 +17,10 @@
 #
 # See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
 require 'factory_girl'
+require 'devise'
 RSpec.configure do |config|
   config.include FactoryGirl::Syntax::Methods
+  config.include Devise::TestHelpers, type: :controller
   # rspec-expectations config goes here. You can use an alternate
   # assertion/expectation library such as wrong or the stdlib/minitest
   # assertions if you prefer.