Add System Test for viewing a Seat's details

This commit introduces `factory_bot` and configures MiniTest to use it
instead of loading our application's fixture files.

The first test drives the browser by visiting the Benedum Center's
Orchestra floor, then clicking on seat `AA-101`.

The `click_on_seat` help is necessary due to Capybara's inability to
treat `<a>` elements nested within `<svg>` elements as if they were
normal `<a>` elements. Capybara's selector strategies include a matcher
that finds `<a>` elements based on their `title` attribute text, or
their `aria-label` attribute text. However, when matching elements exist
within an `<svg>`, they are not found.

To counteract this limitation, the `click_on_seat` uses an `aria-label`
attribute CSS selector to determine which element to click.

Running the tests
---

To simplify executing the entire test suite, this commit declares the
`default` Rake task to execute _both_ [`rails test`][test] and [`rails
test:system`][system-test].

This diff intentionally commits a failing test suite to the project's
revisions history. It represents the "Red" phase of a ["Red, Green,
Refactor" cycle][tdd-cycle], and will be resolved in future commits.

[default-task]: https://github.com/ruby/rake/tree/v13.0.1#label-Usage
[test]: https://guides.rubyonrails.org/v6.0/command_line.html#rails-test
[system-test]: https://guides.rubyonrails.org/v6.0/testing.html#implementing-a-system-test
[tdd-cycle]: https://en.wikipedia.org/wiki/Test-driven_development#Development_style

Gemfile

@@ -34,6 +34,7 @@ end
 group :test do
   # Adds support for Capybara system testing and selenium driver
   gem 'capybara', '>= 2.15'
+  gem 'factory_bot', '~> 5.0.0'
   gem 'selenium-webdriver'
   # Easy installation and use of web drivers to run system tests with browsers
   gem 'webdrivers'

Gemfile.lock

@@ -96,6 +96,8 @@ GEM
       railties (>= 6.0.0)
     date (3.3.3)
     erubi (1.12.0)
+    factory_bot (5.0.2)
+      activesupport (>= 4.2.0)
     ffi (1.15.5)
     form_props (0.0.3)
       actionview (>= 7.0.0)
@@ -231,6 +233,7 @@ DEPENDENCIES
   byebug
   capybara (>= 2.15)
   cssbundling-rails (~> 1.3)
+  factory_bot (~> 5.0.0)
   form_props (~> 0.0.3)
   jbuilder (~> 2.7)
   jsbundling-rails (~> 1.2)

Rakefile

@@ -4,3 +4,5 @@
 require_relative 'config/application'
 
 Rails.application.load_tasks
+
+task default: ["test", "test:system"]

test/factories.rb

@@ -0,0 +1,30 @@
+FactoryBot.define do
+  factory :benedum_center, class: "Venue" do
+    name { "Benedum Center" }
+    slug { "benedum_center" }
+  end
+
+  factory :orchestra, class: "Floor" do
+    association :venue, factory: [:benedum_center]
+
+    name { "Orchestra" }
+    slug { "orchestra" }
+  end
+
+  factory :section do
+    association :floor, factory: [:orchestra]
+
+    name { "Section #{id}" }
+    slug { "section-#{id}" }
+    price { 10_00 }
+  end
+
+  factory :seat do
+    association :section
+
+    sequence(:number)
+    row { "AA" }
+    x { 0 }
+    y { 0 }
+  end
+end

test/system/visitor_views_seats_test.rb

@@ -0,0 +1,19 @@
+require "application_system_test_case"
+
+class VisitorViewsSeatsTest < ApplicationSystemTestCase
+  test "visiting the seats index" do
+    venue = create(:benedum_center)
+    floor = create(:orchestra, venue: venue)
+    section = create(:section, floor: floor, price: 10_00)
+    seat = create(:seat, row: "AA", number: "101", section: section)
+
+    visit("/venues/benedum_center/floors/orchestra/seats")
+    click_on_seat("AA-101")
+
+    assert_text("$10.00")
+  end
+
+  def click_on_seat(row_number)
+    find(%{[aria-label*="#{row_number}"]}).click
+  end
+end

test/test_helper.rb

@@ -6,8 +6,9 @@ class ActiveSupport::TestCase
   # Run tests in parallel with specified workers
   parallelize(workers: :number_of_processors)
 
-  # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
-  fixtures :all
+  include FactoryBot::Syntax::Methods
+
+  FactoryBot.find_definitions
 
   # Add more helper methods to be used by all tests here...
 end