diff --git a/main-server/.gitignore b/main-server/.gitignore
new file mode 100644
index 0000000..3b6ee58
--- /dev/null
+++ b/main-server/.gitignore
@@ -0,0 +1 @@
+/coverage
diff --git a/main-server/.rspec b/main-server/.rspec
new file mode 100644
index 0000000..c99d2e7
--- /dev/null
+++ b/main-server/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/main-server/Gemfile b/main-server/Gemfile
index 80c1159..9732572 100644
--- a/main-server/Gemfile
+++ b/main-server/Gemfile
@@ -1,7 +1,13 @@
 source "https://rubygems.org"
 
 gem "rails", "~> 8.1.2"
+# Use sqlite3 as the database for Active Record in development/test
 gem "sqlite3", ">= 2.1"
+
+# Use PostgreSQL in production
+group :production do
+  gem "pg", "~> 1.5"
+end
 gem "puma", ">= 5.0"
 
 # Use Active Model has_secure_password [https://guides.rubyonrails.org/active_model_basics.html#securepassword]
@@ -34,9 +40,14 @@ gem "rack-cors"
 
 group :development, :test do
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"
+  gem "rspec-rails", "~> 8.0"
   gem "bundler-audit", require: false
   gem "brakeman", require: false
   gem "rubocop-rails-omakase", require: false
 end
 
 gem "redis", "~> 6.0"
+
+group :test do
+  gem "simplecov", require: false
+end
diff --git a/main-server/Gemfile.lock b/main-server/Gemfile.lock
index 2089d47..8d879d2 100644
--- a/main-server/Gemfile.lock
+++ b/main-server/Gemfile.lock
@@ -95,6 +95,7 @@ GEM
     debug (1.11.1)
       irb (~> 1.10)
       reline (>= 0.3.8)
+    diff-lcs (1.6.2)
     dotenv (3.2.0)
     drb (2.2.3)
     ed25519 (1.4.0)
@@ -190,6 +191,11 @@ GEM
     parser (3.3.12.0)
       ast (~> 2.4.1)
       racc
+    pg (1.6.3)
+    pg (1.6.3-aarch64-linux)
+    pg (1.6.3-aarch64-linux-musl)
+    pg (1.6.3-x86_64-linux)
+    pg (1.6.3-x86_64-linux-musl)
     pp (0.6.4)
       prettyprint
     prettyprint (0.2.0)
@@ -257,6 +263,23 @@ GEM
     regexp_parser (2.12.0)
     reline (0.7.0)
       io-console (~> 0.5)
+    rspec-core (3.13.6)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.5)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.8)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-rails (8.0.4)
+      actionpack (>= 7.2)
+      activesupport (>= 7.2)
+      railties (>= 7.2)
+      rspec-core (>= 3.13.0, < 5.0.0)
+      rspec-expectations (>= 3.13.0, < 5.0.0)
+      rspec-mocks (>= 3.13.0, < 5.0.0)
+      rspec-support (>= 3.13.0, < 5.0.0)
+    rspec-support (3.13.7)
     rubocop (1.91.0)
       json (>= 2.3)
       language_server-protocol (~> 3.17.0.2)
@@ -290,6 +313,7 @@ GEM
       ffi (~> 1.12)
       logger
     securerandom (0.4.1)
+    simplecov (1.3.2)
     solid_cable (4.0.2)
       actioncable (>= 7.2)
       activejob (>= 7.2)
@@ -358,11 +382,14 @@ DEPENDENCIES
   json (~> 2.19)
   jwt (~> 2.10)
   kamal
+  pg (~> 1.5)
   puma (>= 5.0)
   rack-cors
   rails (~> 8.1.2)
   redis (~> 6.0)
+  rspec-rails (~> 8.0)
   rubocop-rails-omakase
+  simplecov
   solid_cable
   solid_cache
   solid_queue
@@ -397,6 +424,7 @@ CHECKSUMS
   crass (1.0.7) sha256=94868719948664c89ddcaf0a37c65048413dfcb1c869470a5f7a7ceb5390b295
   date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
   debug (1.11.1) sha256=2e0b0ac6119f2207a6f8ac7d4a73ca8eb4e440f64da0a3136c30343146e952b6
+  diff-lcs (1.6.2) sha256=9ae0d2cba7d4df3075fe8cd8602a8604993efc0dfa934cff568969efb1909962
   dotenv (3.2.0) sha256=e375b83121ea7ca4ce20f214740076129ab8514cd81378161f11c03853fe619d
   drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
   ed25519 (1.4.0) sha256=16e97f5198689a154247169f3453ef4cfd3f7a47481fde0ae33206cdfdcac506
@@ -445,6 +473,11 @@ CHECKSUMS
   ostruct (0.6.3) sha256=95a2ed4a4bd1d190784e666b47b2d3f078e4a9efda2fccf18f84ddc6538ed912
   parallel (2.2.0) sha256=e1059c5fd7b649558a0aec38a769f06a42942bdb40503d005a59c352fe011cd8
   parser (3.3.12.0) sha256=21a6d7f755d5a24dfbdc6e6b772e4e879a52e7631a88bc5a3a134606052c9828
+  pg (1.6.3) sha256=1388d0563e13d2758c1089e35e973a3249e955c659592d10e5b77c468f628a99
+  pg (1.6.3-aarch64-linux) sha256=0698ad563e02383c27510b76bf7d4cd2de19cd1d16a5013f375dd473e4be72ea
+  pg (1.6.3-aarch64-linux-musl) sha256=06a75f4ea04b05140146f2a10550b8e0d9f006a79cdaf8b5b130cde40e3ecc2c
+  pg (1.6.3-x86_64-linux) sha256=5d9e188c8f7a0295d162b7b88a768d8452a899977d44f3274d1946d67920ae8d
+  pg (1.6.3-x86_64-linux-musl) sha256=9c9c90d98c72f78eb04c0f55e9618fe55d1512128e411035fe229ff427864009
   pp (0.6.4) sha256=dfcb0fce700c41456265922884f9fe195d7fbb0674a3578e6c0f69588e82b570
   prettyprint (0.2.0) sha256=2bc9e15581a94742064a3cc8b0fb9d45aae3d03a1baa6ef80922627a0766f193
   prism (1.9.0) sha256=7b530c6a9f92c24300014919c9dcbc055bf4cdf51ec30aed099b06cd6674ef85
@@ -468,6 +501,11 @@ CHECKSUMS
   redis-client (0.30.1) sha256=5151bc5c7bbfe48623732cdae3b900d8a22dc691cc7cdfacfb351ac55116522d
   regexp_parser (2.12.0) sha256=35a916a1d63190ab5c9009457136ae5f3c0c7512d60291d0d1378ba18ce08ebb
   reline (0.7.0) sha256=5b012d8e55dbf9d450f12bde2cf7d15ff546ae80b3f8f3b30e570d431815583d
+  rspec-core (3.13.6) sha256=a8823c6411667b60a8bca135364351dda34cd55e44ff94c4be4633b37d828b2d
+  rspec-expectations (3.13.5) sha256=33a4d3a1d95060aea4c94e9f237030a8f9eae5615e9bd85718fe3a09e4b58836
+  rspec-mocks (3.13.8) sha256=086ad3d3d17533f4237643de0b5c42f04b66348c28bf6b9c2d3f4a3b01af1d47
+  rspec-rails (8.0.4) sha256=06235692fc0892683d3d34977e081db867434b3a24ae0dd0c6f3516bad4e22df
+  rspec-support (3.13.7) sha256=0640e5570872aafefd79867901deeeeb40b0c9875a36b983d85f54fb7381c47c
   rubocop (1.91.0) sha256=9c82b7bf391c5d7e3798c5b9996e22a1fe3bd7468e351dfdeb96140c058296d0
   rubocop-ast (1.50.0) sha256=b9ca88300da0803ee222ad20cdb30494c0a784eed06fdc35d254b06d662788db
   rubocop-performance (1.27.0) sha256=eeeb1374d062a368ee1c787b70eb0b0cc4b184cb1f8565f424760946146d61ce
@@ -476,6 +514,7 @@ CHECKSUMS
   ruby-progressbar (1.13.0) sha256=80fc9c47a9b640d6834e0dc7b3c94c9df37f08cb072b7761e4a71e22cff29b33
   ruby-vips (2.3.0) sha256=e685ec02c13969912debbd98019e50492e12989282da5f37d05f5471442f5374
   securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
+  simplecov (1.3.2) sha256=2a22ec1759f1b8db60881a2e038758956fc69ef93ed669be0bde0678de6d0e85
   solid_cable (4.0.2) sha256=084636a67679ad00d23088b33c84047e614bcf41ee559db24b414d83cdc42d03
   solid_cache (1.0.10) sha256=bc05a2fb3ac78a6f43cbb5946679cf9db67dd30d22939ededc385cb93e120d41
   solid_queue (1.7.0) sha256=6566b70b801d1c317c81bba7bcdd5677c019afac584a30374b4164002ca356d3
diff --git a/main-server/config/application.rb b/main-server/config/application.rb
index b71b039..3d0e093 100644
--- a/main-server/config/application.rb
+++ b/main-server/config/application.rb
@@ -11,7 +11,7 @@ require "action_controller/railtie"
 # require "action_mailbox/engine"
 # require "action_text/engine"
 # require "action_view/railtie"
-# require "action_cable/engine"
+require "action_cable/engine"
 # require "rails/test_unit/railtie"
 
 # Require the gems listed in Gemfile, including any gems
diff --git a/main-server/config/database.yml b/main-server/config/database.yml
index 302d638..95234dc 100644
--- a/main-server/config/database.yml
+++ b/main-server/config/database.yml
@@ -20,21 +20,20 @@ test:
   <<: *default
   database: storage/test.sqlite3
 
-# Store production database in the storage/ directory, which by default
-# is mounted as a persistent Docker volume in config/deploy.yml.
+# PostgreSQL for production.
+#
+# Configure via DATABASE_URL environment variable:
+#   postgresql://user:password@host:5432/database
+#
+# Or via individual variables:
+#   DB_NAME, DB_USER, DB_PASSWORD, DB_HOST, DB_PORT
+#
 production:
-  primary:
-    <<: *default
-    database: storage/production.sqlite3
-  cache:
-    <<: *default
-    database: storage/production_cache.sqlite3
-    migrations_paths: db/cache_migrate
-  queue:
-    <<: *default
-    database: storage/production_queue.sqlite3
-    migrations_paths: db/queue_migrate
-  cable:
-    <<: *default
-    database: storage/production_cable.sqlite3
-    migrations_paths: db/cable_migrate
+  adapter: postgresql
+  encoding: unicode
+  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+  database: <%= ENV["DB_NAME"] %>
+  username: <%= ENV["DB_USER"] %>
+  password: <%= ENV["DB_PASSWORD"] %>
+  host: <%= ENV["DB_HOST"] %>
+  port: <%= ENV["DB_PORT"] || 5432 %>
diff --git a/main-server/config/environments/test.rb b/main-server/config/environments/test.rb
index c2095b1..1427836 100644
--- a/main-server/config/environments/test.rb
+++ b/main-server/config/environments/test.rb
@@ -31,13 +31,7 @@ Rails.application.configure do
   # Store uploaded files on the local file system in a temporary directory.
   config.active_storage.service = :test
 
-  # Tell Action Mailer not to deliver emails to the real world.
-  # The :test delivery method accumulates sent emails in the
-  # ActionMailer::Base.deliveries array.
-  config.action_mailer.delivery_method = :test
-
-  # Set host to be used by links generated in mailer templates.
-  config.action_mailer.default_url_options = { host: "example.com" }
+  # Action Mailer is not enabled in this application.
 
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr
diff --git a/main-server/spec/models/user_spec.rb b/main-server/spec/models/user_spec.rb
new file mode 100644
index 0000000..d78dbb0
--- /dev/null
+++ b/main-server/spec/models/user_spec.rb
@@ -0,0 +1,66 @@
+require "rails_helper"
+
+RSpec.describe User, type: :model do
+  let(:valid_attributes) { { nickname: "player_one", password: "secret123" } }
+
+  describe "validations" do
+    it "is valid with a nickname and password" do
+      expect(User.new(valid_attributes)).to be_valid
+    end
+
+    it "requires a nickname" do
+      user = User.new(valid_attributes.merge(nickname: nil))
+      expect(user).not_to be_valid
+      expect(user.errors[:nickname]).to be_present
+    end
+
+    it "requires a password" do
+      user = User.new(nickname: "player_one", password: nil)
+      expect(user).not_to be_valid
+      expect(user.errors[:password]).to be_present
+    end
+
+    it "rejects nicknames shorter than 3 characters" do
+      expect(User.new(valid_attributes.merge(nickname: "ab"))).not_to be_valid
+    end
+
+    it "rejects nicknames longer than 24 characters" do
+      expect(User.new(valid_attributes.merge(nickname: "a" * 25))).not_to be_valid
+    end
+
+    it "rejects passwords shorter than 6 characters" do
+      expect(User.new(valid_attributes.merge(password: "12345"))).not_to be_valid
+    end
+
+    it "requires nicknames to be unique case-insensitively" do
+      User.create!(valid_attributes)
+      duplicate = User.new(valid_attributes.merge(nickname: "PLAYER_ONE"))
+      expect(duplicate).not_to be_valid
+      expect(duplicate.errors[:nickname]).to be_present
+    end
+  end
+
+  describe "nickname normalization" do
+    it "strips surrounding whitespace" do
+      user = User.create!(valid_attributes.merge(nickname: "  player_one  "))
+      expect(user.nickname).to eq("player_one")
+    end
+  end
+
+  describe "password authentication" do
+    it "authenticates with the correct password" do
+      user = User.create!(valid_attributes)
+      expect(user.authenticate("secret123")).to eq(user)
+    end
+
+    it "rejects a wrong password" do
+      user = User.create!(valid_attributes)
+      expect(user.authenticate("wrong")).to be_falsey
+    end
+
+    it "does not require a password when updating other attributes" do
+      user = User.create!(valid_attributes)
+      expect(user.update(nickname: "new_nickname")).to be true
+    end
+  end
+end
diff --git a/main-server/spec/rails_helper.rb b/main-server/spec/rails_helper.rb
new file mode 100644
index 0000000..ee4d56a
--- /dev/null
+++ b/main-server/spec/rails_helper.rb
@@ -0,0 +1,78 @@
+# This file is copied to spec/ when you run 'rails generate rspec:install'
+if ENV["COVERAGE"]
+  require "simplecov"
+  SimpleCov.start "rails" do
+    add_filter "/spec/"
+  end
+end
+require 'spec_helper'
+ENV['RAILS_ENV'] ||= 'test'
+require_relative '../config/environment'
+# Prevent database truncation if the environment is production
+abort("The Rails environment is running in production mode!") if Rails.env.production?
+# Uncomment the line below in case you have `--require rails_helper` in the `.rspec` file
+# that will avoid rails generators crashing because migrations haven't been run yet
+# return unless Rails.env.test?
+require 'rspec/rails'
+# Add additional requires below this line. Rails is not loaded until this point!
+
+# Requires supporting ruby files with custom matchers and macros, etc, in
+# spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
+# run as spec files by default. This means that files in spec/support that end
+# in _spec.rb will both be required and run as specs, causing the specs to be
+# run twice. It is recommended that you do not name files matching this glob to
+# end with _spec.rb. You can configure this pattern with the --pattern
+# option on the command line or in ~/.rspec, .rspec or `.rspec-local`.
+#
+# The following line is provided for convenience purposes. It has the downside
+# of increasing the boot-up time by auto-requiring all files in the support
+# directory. Alternatively, in the individual `*_spec.rb` files, manually
+# require only the support files necessary.
+#
+# Rails.root.glob('spec/support/**/*.rb').sort_by(&:to_s).each { |f| require f }
+
+# Ensures that the test database schema matches the current schema file.
+# If there are pending migrations it will invoke `db:test:prepare` to
+# recreate the test database by loading the schema.
+# If you are not using ActiveRecord, you can remove these lines.
+begin
+  ActiveRecord::Migration.maintain_test_schema!
+rescue ActiveRecord::PendingMigrationError => e
+  abort e.to_s.strip
+end
+RSpec.configure do |config|
+  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
+  config.fixture_paths = [
+    Rails.root.join('spec/fixtures')
+  ]
+
+  # If you're not using ActiveRecord, or you'd prefer not to run each of your
+  # examples within a transaction, remove the following line or assign false
+  # instead of true.
+  config.use_transactional_fixtures = true
+
+  # You can uncomment this line to turn off ActiveRecord support entirely.
+  # config.use_active_record = false
+
+  # RSpec Rails uses metadata to mix in different behaviours to your tests,
+  # for example enabling you to call `get` and `post` in request specs. e.g.:
+  #
+  #     RSpec.describe UsersController, type: :request do
+  #       # ...
+  #     end
+  #
+  # The different available types are documented in the features, such as in
+  # https://rspec.info/features/8-0/rspec-rails
+  #
+  # You can also infer these behaviours automatically by location, e.g.
+  # /spec/models would pull in the same behaviour as `type: :model` but this
+  # behaviour is considered legacy and will be removed in a future version.
+  #
+  # To enable this behaviour uncomment the line below.
+  # config.infer_spec_type_from_file_location!
+
+  # Filter lines from Rails gems in backtraces.
+  config.filter_rails_from_backtrace!
+  # arbitrary gems may also be filtered via:
+  # config.filter_gems_from_backtrace("gem name")
+end
diff --git a/main-server/spec/services/jwt_service_spec.rb b/main-server/spec/services/jwt_service_spec.rb
new file mode 100644
index 0000000..04810cd
--- /dev/null
+++ b/main-server/spec/services/jwt_service_spec.rb
@@ -0,0 +1,50 @@
+require "rails_helper"
+
+RSpec.describe JwtService do
+  describe ".encode" do
+    it "returns a JWT string" do
+      token = described_class.encode(user_id: 1)
+      expect(token).to be_a(String)
+      expect(token.split(".").size).to eq(3)
+    end
+
+    it "sets a default expiration about 7 days in the future" do
+      token = described_class.encode(user_id: 1)
+      payload = JWT.decode(token, described_class::SECRET_KEY, true, algorithm: described_class::ALGORITHM).first
+      expect(payload["exp"]).to be_within(60).of(7.days.from_now.to_i)
+    end
+
+    it "keeps a custom expiration if provided" do
+      custom_exp = 1.hour.from_now.to_i
+      token = described_class.encode(user_id: 1, exp: custom_exp)
+      payload = JWT.decode(token, described_class::SECRET_KEY, true, algorithm: described_class::ALGORITHM).first
+      expect(payload["exp"]).to eq(custom_exp)
+    end
+  end
+
+  describe ".decode" do
+    it "round-trips the user_id" do
+      token = described_class.encode(user_id: 42)
+      expect(described_class.decode(token)[:user_id]).to eq(42)
+    end
+
+    it "returns nil for a tampered token" do
+      token = described_class.encode(user_id: 42)
+      expect(described_class.decode(token + "x")).to be_nil
+    end
+
+    it "returns nil for a token signed with a different secret" do
+      token = JWT.encode({ user_id: 42 }, "wrong-secret", "HS256")
+      expect(described_class.decode(token)).to be_nil
+    end
+
+    it "returns nil for an expired token" do
+      token = described_class.encode(user_id: 42, exp: 1.minute.ago.to_i)
+      expect(described_class.decode(token)).to be_nil
+    end
+
+    it "returns nil for garbage input" do
+      expect(described_class.decode("not-a-token")).to be_nil
+    end
+  end
+end
diff --git a/main-server/spec/spec_helper.rb b/main-server/spec/spec_helper.rb
new file mode 100644
index 0000000..327b58e
--- /dev/null
+++ b/main-server/spec/spec_helper.rb
@@ -0,0 +1,94 @@
+# This file was generated by the `rails generate rspec:install` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+# The settings below are suggested to provide a good initial experience
+# with RSpec, but feel free to customize to your heart's content.
+=begin
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
+  config.disable_monkey_patching!
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+=end
+end