diff --git a/Gemfile b/Gemfile
index ed73c00..e54c8f8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -50,7 +50,13 @@ 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 'factory_bot_rails'
+
+  gem 'rails-controller-testing'
+
   gem 'rspec-rails'
+
+  gem 'shoulda-matchers'
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 430a8c7..a580c08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,6 +105,11 @@ GEM
       ruby2_keywords
     error_highlight (0.5.1)
     erubi (1.12.0)
+    factory_bot (6.4.2)
+      activesupport (>= 5.0.0)
+    factory_bot_rails (6.4.2)
+      factory_bot (~> 6.4)
+      railties (>= 5.0.0)
     globalid (1.2.1)
       activesupport (>= 6.1)
     i18n (1.14.1)
@@ -114,13 +119,13 @@ GEM
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
     io-console (0.6.0)
-    irb (1.9.1)
+    irb (1.10.1)
       rdoc
       reline (>= 0.3.8)
     jbuilder (2.11.5)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
-    json (2.6.3)
+    json (2.7.1)
     language_server-protocol (3.17.0.3)
     loofah (2.22.0)
       crass (~> 1.0.2)
@@ -136,7 +141,7 @@ GEM
     minitest (5.20.0)
     msgpack (1.7.2)
     mutex_m (0.2.0)
-    net-imap (0.4.6)
+    net-imap (0.4.7)
       date
       net-protocol
     net-pop (0.1.2)
@@ -145,7 +150,7 @@ GEM
       timeout
     net-smtp (0.4.0)
       net-protocol
-    nio4r (2.6.1)
+    nio4r (2.7.0)
     nokogiri (1.15.5-x86_64-linux)
       racc (~> 1.4)
     parallel (1.23.0)
@@ -181,6 +186,10 @@ GEM
       activesupport (= 7.1.2)
       bundler (>= 1.15.0)
       railties (= 7.1.2)
+    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
@@ -198,9 +207,9 @@ GEM
       zeitwerk (~> 2.6)
     rainbow (3.1.1)
     rake (13.1.0)
-    rdoc (6.6.0)
+    rdoc (6.6.1)
       psych (>= 4.0.0)
-    regexp_parser (2.8.2)
+    regexp_parser (2.8.3)
     reline (0.4.1)
       io-console (~> 0.5)
     rexml (3.2.6)
@@ -242,6 +251,8 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
+    shoulda-matchers (5.3.0)
+      activesupport (>= 5.2.0)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)
@@ -283,14 +294,17 @@ DEPENDENCIES
   capybara
   debug
   error_highlight (>= 0.4.0)
+  factory_bot_rails
   importmap-rails
   jbuilder
   pg (~> 1.1)
   puma (>= 5.0)
   rails (~> 7.1.2)
+  rails-controller-testing
   rspec-rails
   rubocop (~> 1.56.1)
   selenium-webdriver
+  shoulda-matchers
   sprockets-rails
   stimulus-rails
   turbo-rails
@@ -298,7 +312,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 3.1.3
+   ruby 3.1.3p185
 
 BUNDLED WITH
    2.4.22
diff --git a/README.md b/README.md
index a50df1a..7115be3 100644
--- a/README.md
+++ b/README.md
@@ -215,7 +215,7 @@ To execute the tests, run the following command inside the project folder:
 - [x] Processing data in models.
 - [x] Validations and Model specs.
 - [x] Controllers.
-- [ ] Controllers specs.
+- [x] Controllers specs.
 - [ ] Views.
 - [ ] Forms.
 - [ ] Integration specs for Views and fixing n+1 problems.
diff --git a/spec/factories/comments_factory.rb b/spec/factories/comments_factory.rb
new file mode 100644
index 0000000..ba8fef2
--- /dev/null
+++ b/spec/factories/comments_factory.rb
@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :comment do
+    text { 'This is a sample comment' }
+    association :post, factory: :post
+    association :author, factory: :user
+  end
+end
diff --git a/spec/factories/likes_factory.rb b/spec/factories/likes_factory.rb
new file mode 100644
index 0000000..e9e3bb5
--- /dev/null
+++ b/spec/factories/likes_factory.rb
@@ -0,0 +1,12 @@
+FactoryBot.define do
+  factory :like do
+    association :post
+    association :user
+
+    # ? Build associated objects automatically
+    after(:build) do |like|
+      like.post.save!
+      like.user.save!
+    end
+  end
+end
diff --git a/spec/factories/posts_factory.rb b/spec/factories/posts_factory.rb
new file mode 100644
index 0000000..f6bb951
--- /dev/null
+++ b/spec/factories/posts_factory.rb
@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :post do
+    title { 'Sample Title' }
+    text { 'This is sample text' }
+    association :author, factory: :user
+  end
+end
diff --git a/spec/factories/users_factory.rb b/spec/factories/users_factory.rb
new file mode 100644
index 0000000..ce47589
--- /dev/null
+++ b/spec/factories/users_factory.rb
@@ -0,0 +1,8 @@
+FactoryBot.define do
+  factory :user do
+    name { 'John Doe' }
+    photo { 'https://example.com/photo.jpg' }
+    bio { 'A bio for John Doe.' }
+    posts_counter { 0 }
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
new file mode 100644
index 0000000..98dc673
--- /dev/null
+++ b/spec/rails_helper.rb
@@ -0,0 +1,79 @@
+# This file is copied to spec/ when you run 'rails generate rspec:install'
+require 'spec_helper'
+require 'factory_bot_rails'
+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
+  puts e.to_s.strip
+  exit 1
+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
+
+  # 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://relishapp.com/rspec/rspec-rails/docs
+  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")
+  # ... (todo lo demás sigue igual)
+
+  # Shoulda Matchers
+  Shoulda::Matchers.configure do |shoulda_config|
+    shoulda_config.integrate do |with|
+      with.test_framework :rspec
+      with.library :rails
+    end
+  end
+
+  # FactoryBot
+  RSpec.configure do |rspec_config|
+    rspec_config.include FactoryBot::Syntax::Methods
+  end
+end
diff --git a/spec/requests/posts_controller_spec.rb b/spec/requests/posts_controller_spec.rb
new file mode 100644
index 0000000..f325b08
--- /dev/null
+++ b/spec/requests/posts_controller_spec.rb
@@ -0,0 +1,26 @@
+require 'rails_helper'
+
+RSpec.describe 'PostsController', type: :request do
+  describe 'GET #index' do
+    it 'renders the index template' do
+      user = create(:user)
+      get "/users/#{user.id}/posts"
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template(:index)
+      expect(response.body).to include('posts/index')
+    end
+  end
+
+  describe 'GET #show' do
+    it 'renders the show template' do
+      user = create(:user)
+      post = create(:post, author: user)
+      get "/users/#{user.id}/posts/#{post.id}"
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template(:show)
+      expect(response.body).to include('posts/show')
+    end
+  end
+end
diff --git a/spec/requests/users_controller_spec.rb b/spec/requests/users_controller_spec.rb
new file mode 100644
index 0000000..23284c0
--- /dev/null
+++ b/spec/requests/users_controller_spec.rb
@@ -0,0 +1,24 @@
+require 'rails_helper'
+
+RSpec.describe 'UsersController', type: :request do
+  describe 'GET #index' do
+    it 'renders the index template' do
+      get '/users'
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template(:index)
+      expect(response.body).to include('users/index')
+    end
+  end
+
+  describe 'GET #show' do
+    it 'renders the show template' do
+      user = create(:user)
+      get "/users/#{user.id}"
+
+      expect(response).to have_http_status(200)
+      expect(response).to render_template(:show)
+      expect(response.body).to include('users/show')
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 886eed8..9c96a9b 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,4 @@
-require_relative '../config/environment' # ! important to run rails environment first
-# This file was generated by the `rspec --init` command. Conventionally, all
+# 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
@@ -64,10 +63,6 @@
   #   # https://rspec.info/features/3-12/rspec-core/configuration/zero-monkey-patching-mode/
   #   config.disable_monkey_patching!
   #
-  #   # This setting enables warnings. It's recommended, but in some cases may
-  #   # be too noisy due to issues in dependencies.
-  #   config.warnings = true
-  #
   #   # 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.