Provide primitive test coverage of the ticket pdf

Gemfile

@@ -276,6 +276,8 @@ group :test do
   gem 'rails-controller-testing'
   # For managing the environment
   gem 'climate_control'
+  # For PDFs
+  gem 'pdf-inspector', require: "pdf/inspector"
 end
 
 group :development, :test do

Gemfile.lock

@@ -12,6 +12,7 @@ GEM
   remote: https://rubygems.org/
   remote: https://rails-assets.org/
   specs:
+    Ascii85 (1.0.3)
     actioncable (5.0.7.1)
       actionpack (= 5.0.7.1)
       nio4r (>= 1.2, < 3.0)
@@ -62,6 +63,7 @@ GEM
       activerecord (>= 3.0)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
+    afm (0.2.2)
     airbrake (7.4.0)
       airbrake-ruby (~> 2.12)
     airbrake-ruby (2.12.0)
@@ -226,6 +228,7 @@ GEM
       rubocop (>= 0.50.0)
       sysexits (~> 1.1)
     hashdiff (0.3.7)
+    hashery (2.1.2)
     hashie (3.5.7)
     html2haml (2.2.0)
       erubis (~> 2.7.0)
@@ -350,6 +353,14 @@ GEM
     parser (2.5.3.0)
       ast (~> 2.4.0)
     pdf-core (0.2.5)
+    pdf-inspector (1.3.0)
+      pdf-reader (>= 1.0, < 3.0.a)
+    pdf-reader (2.2.0)
+      Ascii85 (~> 1.0.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     pg (1.1.3)
     piwik_analytics (1.0.2)
       actionpack
@@ -497,6 +508,7 @@ GEM
     ruby-oembed (0.12.0)
     ruby-openid (2.5.0)
     ruby-progressbar (1.10.0)
+    ruby-rc4 (0.1.5)
     ruby_dep (1.5.0)
     ruby_parser (3.11.0)
       sexp_processor (~> 4.9)
@@ -664,6 +676,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   omniauth-openid
   paper_trail
+  pdf-inspector
   pg
   piwik_analytics (~> 1.0.1)
   prawn-qrcode (~> 0.2.2.1)

spec/pdfs/ticket_pdf_spec.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe TicketPdf do
+  let(:registration_ticket) { create(:registration_ticket, price_cents: 0) }
+  let(:conference) do
+    create(
+      :conference,
+      title:               'ExampleCon',
+      tickets:             [registration_ticket],
+      registration_period: create(:registration_period, start_date: 3.days.ago)
+    )
+  end
+  let(:participant) { create(:user) }
+  let(:ticket_purchase) do
+    create(
+      :ticket_purchase,
+      user:       participant,
+      conference: conference,
+      ticket:     registration_ticket,
+      quantity:   1
+    )
+  end
+  let(:physical_ticket) do
+    create(:physical_ticket, ticket_purchase: ticket_purchase)
+  end
+  let(:layout) { conference.ticket_layout.to_sym }
+  let(:file_name) { "ticket_for_#{conference.short_title}.pdf" }
+
+  it 'generates a PDF for a physical ticket' do
+    pdf = described_class.new(conference, participant, physical_ticket, layout, file_name)
+    page_analysis = PDF::Inspector::Page.analyze(pdf.render)
+    expect(page_analysis.pages.length).to eq(1)
+    expect(page_analysis.pages.first[:strings]).to include(conference.title)
+  end
+end