diff --git a/.rspec b/.rspec
new file mode 100644
index 0000000..c99d2e7
--- /dev/null
+++ b/.rspec
@@ -0,0 +1 @@
+--require spec_helper
diff --git a/Gemfile b/Gemfile
index 8d353d4..47759dc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -50,6 +50,9 @@ gem "bootsnap", require: false
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ]
+  gem "rspec-rails"
+  gem "rails-controller-testing"
+  gem "factory_bot_rails"
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 7247bef..c93b401 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,11 +96,17 @@ GEM
       railties (>= 4.1.0)
       responders
       warden (~> 1.2.3)
+    diff-lcs (1.5.0)
     domain_name (0.5.20190701)
       unf (>= 0.0.5, < 1.0.0)
     drb (2.1.1)
       ruby2_keywords
     erubi (1.12.0)
+    factory_bot (6.2.1)
+      activesupport (>= 5.0.0)
+    factory_bot_rails (6.2.0)
+      factory_bot (~> 6.2.0)
+      railties (>= 5.0.0)
     ffi (1.16.3)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
@@ -188,6 +194,10 @@ GEM
       activesupport (= 7.1.1)
       bundler (>= 1.15.0)
       railties (= 7.1.1)
+    rails-controller-testing (1.0.5)
+      actionpack (>= 5.0.1.rc1)
+      actionview (>= 5.0.1.rc1)
+      activesupport (>= 5.0.1.rc1)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
@@ -211,6 +221,23 @@ GEM
     responders (3.1.1)
       actionpack (>= 5.2)
       railties (>= 5.2)
+    rspec-core (3.12.2)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.3)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.6)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-rails (6.0.3)
+      actionpack (>= 6.1)
+      activesupport (>= 6.1)
+      railties (>= 6.1)
+      rspec-core (~> 3.12)
+      rspec-expectations (~> 3.12)
+      rspec-mocks (~> 3.12)
+      rspec-support (~> 3.12)
+    rspec-support (3.12.1)
     ruby2_keywords (0.0.5)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
@@ -258,11 +285,14 @@ DEPENDENCIES
   bootsnap
   debug
   devise
+  factory_bot_rails
   http
   importmap-rails
   jbuilder
   puma (>= 5.0)
   rails (~> 7.1.1)
+  rails-controller-testing
+  rspec-rails
   sprockets-rails
   sqlite3 (~> 1.4)
   stimulus-rails
diff --git a/bin/rspec b/bin/rspec
new file mode 100755
index 0000000..cb53ebe
--- /dev/null
+++ b/bin/rspec
@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'rspec' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
+
+bundle_binstub = File.expand_path("bundle", __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300).include?("This file was generated by Bundler")
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require "rubygems"
+require "bundler/setup"
+
+load Gem.bin_path("rspec-core", "rspec")
diff --git a/config/routes.rb b/config/routes.rb
index 9829d9d..9a9074c 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,6 +1,7 @@
 Rails.application.routes.draw do
   devise_for :users
-  get 'dictionary/index'
+  #get 'dictionary/index'
+  resources :dictionary, only: [:index]
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
new file mode 100644
index 0000000..cafcd0f
--- /dev/null
+++ b/spec/factories/users.rb
@@ -0,0 +1,6 @@
+FactoryBot.define do
+  factory :user do
+    sequence(:username) { |n| "test-#{n.to_s.rjust(3, "0")}@sample.com" }
+    password { "12345678" }
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
new file mode 100644
index 0000000..04a6c45
--- /dev/null
+++ b/spec/rails_helper.rb
@@ -0,0 +1,72 @@
+# This file is copied to spec/ when you run 'rails generate rspec:install'
+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?
+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.
+#
+# Dir[Rails.root.join('spec', 'support', '**', '*.rb')].sort.each { |f| require f }
+
+# Checks for pending migrations and applies them before tests are run.
+# 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_path = "#{::Rails.root}/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
+
+  # Devise and Warden
+  config.expect_with :rspec do |c|
+    c.syntax = :expect
+  end
+
+  config.include Devise::Test::IntegrationHelpers, type: :request
+  config.include Devise::Test::ControllerHelpers, type: :controller
+  config.include Warden::Test::Helpers
+
+  # You can uncomment this line to turn off ActiveRecord support entirely.
+  # config.use_active_record = false
+
+  # RSpec Rails can automatically mix in different behaviours to your tests
+  # based on their file location, for example enabling you to call `get` and
+  # `post` in specs under `spec/controllers`.
+  #
+  # You can disable this behaviour by removing the line below, and instead
+  # explicitly tag your specs with their type, e.g.:
+  #
+  #     RSpec.describe UsersController, type: :controller do
+  #       # ...
+  #     end
+  #
+  # The different available types are documented in the features, such as in
+  # https://rspec.info/features/6-0/rspec-rails
+  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/spec/requests/dictionary_spec.rb b/spec/requests/dictionary_spec.rb
new file mode 100644
index 0000000..daed06f
--- /dev/null
+++ b/spec/requests/dictionary_spec.rb
@@ -0,0 +1,10 @@
+require 'rails_helper'
+
+RSpec.describe "Dictionary", type: :request do
+  describe "GET /index" do
+    it 'renders the index template' do
+      get "/dictionary"
+      expect(response).to render_template(:index)
+    end
+  end
+end
diff --git a/spec/requests/root_spec.rb b/spec/requests/root_spec.rb
new file mode 100644
index 0000000..88bebfa
--- /dev/null
+++ b/spec/requests/root_spec.rb
@@ -0,0 +1,32 @@
+require 'rails_helper'
+
+RSpec.describe "Root path", type: :request do
+  describe "GET /" do
+    it "works! (now write some real specs)" do
+      get root_path
+      expect(response).to have_http_status(200)
+    end
+  end
+
+  describe "logged out" do
+    it "should have 'Register' link" do
+      get root_path
+      expect(response.body).to include("Register")
+    end
+  end
+
+  describe "logged in" do
+    it "should have 'Sign Out' link" do
+      sign_in FactoryBot.create(:user)
+      get root_path
+      expect(response.body).to include("Sign Out")
+    end
+
+    it "should welcome user by username" do
+      user = FactoryBot.create(:user)
+      sign_in user
+      get root_path
+      expect(response.body).to include(user.username)
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
new file mode 100644
index 0000000..327b58e
--- /dev/null
+++ b/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
diff --git a/spec/support/controller_macros.rb b/spec/support/controller_macros.rb
new file mode 100644
index 0000000..e0da1ab
--- /dev/null
+++ b/spec/support/controller_macros.rb
@@ -0,0 +1,9 @@
+module ControllerMacros
+  def login_user
+    before(:each) do
+      @request.env["devise.mapping"] = Devise.mappings[:user]
+      user = FactoryBot.create(:user)
+      sign_in user
+    end
+  end
+end
diff --git a/spec/support/devise.rb b/spec/support/devise.rb
new file mode 100644
index 0000000..063266c
--- /dev/null
+++ b/spec/support/devise.rb
@@ -0,0 +1,6 @@
+require_relative './controller_macros'
+
+RSpec.configure do |config|
+  config.include Devise::Test::ControllerHelpers, type: :controller
+  config.extend ControllerMacros, type: :controller
+end