Add an example spec

Rakefile

@@ -1,2 +1,12 @@
 require "bundler/gem_tasks"
+require 'rspec/core/rake_task'
 
+RSpec::Core::RakeTask.new('spec')
+
+# If you want to make this the default task
+task :default => :spec
+task :test => :spec
+
+task :console do
+  exec "irb -r receipts -I ./lib"
+end

lib/receipts/receipt.rb

@@ -1,5 +1,5 @@
 require 'prawn'
-require 'prawn-table'
+require 'prawn/table'
 
 module Receipts
   class Receipt < Prawn::Document
@@ -42,7 +42,12 @@ def generate
 
       def header
         move_down 60
-        image company.fetch(:logo), height: 32
+
+        if company.has_key? :logo
+          image company.fetch(:logo), height: 32
+        else
+          move_down 32
+        end
 
         move_down 8
         text "<color rgb='a6a6a6'>RECEIPT FOR CHARGE ##{id}</color>", inline_format: true

receipts.gemspec

@@ -20,6 +20,8 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "bundler", "~> 1.7"
   spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "rspec"
+  spec.add_development_dependency "pry"
 
   spec.add_dependency 'prawn', '~> 1.3.0'
   spec.add_dependency 'prawn-table', '~> 0.2.1'

spec/receipts_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Receipts do
+  it "lets you create a new receipt" do
+    expect(Receipts::Receipt.new(
+      id: 1,
+      product: "GoRails",
+      company: {
+        name: "One Month, Inc.",
+        address: "37 Great Jones\nFloor 2\nNew York City, NY 10012",
+        email: "[email protected]"
+      },
+      line_items: [
+        ["Product",        "GoRails"],
+      ],
+    ).class.name).to eq("Receipts::Receipt")
+  end
+end

spec/spec_helper.rb

@@ -0,0 +1,9 @@
+begin
+  require 'pry'
+rescue LoadError
+end
+
+require 'receipts'
+
+RSpec.configure do |config|
+end