diff --git a/test/controllers/admin/dashboard_controller_test.rb b/test/controllers/admin/dashboard_controller_test.rb
new file mode 100644
index 0000000..6d05dbf
--- /dev/null
+++ b/test/controllers/admin/dashboard_controller_test.rb
@@ -0,0 +1,36 @@
+require "test_helper"
+
+class Admin::DashboardControllerTest < ActionDispatch::IntegrationTest
+  test "should redirect to login when not authenticated" do
+    get admin_root_path
+    assert_redirected_to login_path
+    follow_redirect!
+    assert_select ".bg-red-50", /You must be logged in/
+  end
+
+  test "should redirect to root when logged in as non-admin" do
+    login_as(users(:contributor_user))
+    get admin_root_path
+    assert_redirected_to root_path
+    assert_equal "You must be an administrator to access this page.", flash[:alert]
+  end
+
+  test "should redirect to root when logged in as reviewer" do
+    login_as(users(:reviewer_user))
+    get admin_root_path
+    assert_redirected_to root_path
+    assert_equal "You must be an administrator to access this page.", flash[:alert]
+  end
+
+  test "should show dashboard when logged in as admin" do
+    login_as(users(:admin_user))
+    get admin_root_path
+    assert_response :success
+  end
+
+  test "should show admin dashboard path" do
+    login_as(users(:admin_user))
+    get admin_dashboard_path
+    assert_response :success
+  end
+end
diff --git a/test/controllers/admin/invitations_controller_test.rb b/test/controllers/admin/invitations_controller_test.rb
new file mode 100644
index 0000000..69c3d70
--- /dev/null
+++ b/test/controllers/admin/invitations_controller_test.rb
@@ -0,0 +1,116 @@
+require "test_helper"
+
+class Admin::InvitationsControllerTest < ActionDispatch::IntegrationTest
+  test "should redirect to login when not authenticated" do
+    get admin_invitations_path
+    assert_redirected_to login_path
+  end
+
+  test "should redirect to root when logged in as non-admin" do
+    login_as(users(:contributor_user))
+    get admin_invitations_path
+    assert_redirected_to root_path
+  end
+
+  test "should show invitations index when logged in as admin" do
+    login_as(users(:admin_user))
+    get admin_invitations_path
+    assert_response :success
+  end
+
+  test "should get new invitation page when logged in as admin" do
+    login_as(users(:admin_user))
+    get new_admin_invitation_path
+    assert_response :success
+  end
+
+  test "should create invitation when logged in as admin" do
+    login_as(users(:admin_user))
+
+    assert_difference("User.count", 1) do
+      post admin_invitations_path, params: {
+        user: {
+          email: "newuser@example.com",
+          name: "New User",
+          role: "contributor",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_redirected_to admin_invitations_path
+
+    new_user = User.find_by(email: "newuser@example.com")
+    assert_not_nil new_user
+    assert_not_nil new_user.invitation_token
+    assert_not_nil new_user.invitation_sent_at
+    assert_nil new_user.invitation_accepted_at
+    assert_equal users(:admin_user).id, new_user.invited_by_id
+  end
+
+  test "should not create invitation with invalid data" do
+    login_as(users(:admin_user))
+
+    assert_no_difference("User.count") do
+      post admin_invitations_path, params: {
+        user: {
+          email: "",
+          name: "New User",
+          role: "contributor",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_response :unprocessable_entity
+  end
+
+  test "should cancel pending invitation when logged in as admin" do
+    login_as(users(:admin_user))
+
+    assert_difference("User.count", -1) do
+      delete admin_invitation_path(users(:pending_invitation))
+    end
+
+    assert_redirected_to admin_invitations_path
+  end
+
+  test "should not cancel accepted invitation" do
+    login_as(users(:admin_user))
+
+    assert_no_difference("User.count") do
+      delete admin_invitation_path(users(:contributor_user))
+    end
+
+    assert_redirected_to admin_invitations_path
+    follow_redirect!
+    assert_select ".bg-red-50", /Cannot cancel an accepted invitation/
+  end
+
+  test "should not allow non-admin to create invitation" do
+    login_as(users(:contributor_user))
+
+    assert_no_difference("User.count") do
+      post admin_invitations_path, params: {
+        user: {
+          email: "newuser@example.com",
+          name: "New User",
+          role: "contributor",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_redirected_to root_path
+  end
+
+  test "should not allow non-admin to cancel invitation" do
+    login_as(users(:contributor_user))
+
+    assert_no_difference("User.count") do
+      delete admin_invitation_path(users(:pending_invitation))
+    end
+
+    assert_redirected_to root_path
+  end
+end
diff --git a/test/controllers/admin/users_controller_test.rb b/test/controllers/admin/users_controller_test.rb
new file mode 100644
index 0000000..53b9392
--- /dev/null
+++ b/test/controllers/admin/users_controller_test.rb
@@ -0,0 +1,68 @@
+require "test_helper"
+
+class Admin::UsersControllerTest < ActionDispatch::IntegrationTest
+  test "should redirect to login when not authenticated" do
+    get admin_users_path
+    assert_redirected_to login_path
+  end
+
+  test "should redirect to root when logged in as non-admin" do
+    login_as(users(:contributor_user))
+    get admin_users_path
+    assert_redirected_to root_path
+  end
+
+  test "should show users index when logged in as admin" do
+    login_as(users(:admin_user))
+    get admin_users_path
+    assert_response :success
+  end
+
+  test "should get edit page for user when logged in as admin" do
+    login_as(users(:admin_user))
+    get edit_admin_user_path(users(:contributor_user))
+    assert_response :success
+  end
+
+  test "should update user role when logged in as admin" do
+    login_as(users(:admin_user))
+
+    patch admin_user_path(users(:contributor_user)), params: {
+      user: { role: "reviewer" }
+    }
+
+    assert_redirected_to admin_users_path
+    assert_equal "reviewer", users(:contributor_user).reload.role
+  end
+
+  test "should delete user when logged in as admin" do
+    login_as(users(:admin_user))
+
+    # Delete reviewer_user who has no associated records
+    assert_difference("User.count", -1) do
+      delete admin_user_path(users(:reviewer_user))
+    end
+
+    assert_redirected_to admin_users_path
+  end
+
+  test "should not allow non-admin to update user" do
+    login_as(users(:contributor_user))
+
+    patch admin_user_path(users(:reviewer_user)), params: {
+      user: { role: "admin" }
+    }
+
+    assert_redirected_to root_path
+  end
+
+  test "should not allow non-admin to delete user" do
+    login_as(users(:contributor_user))
+
+    assert_no_difference("User.count") do
+      delete admin_user_path(users(:reviewer_user))
+    end
+
+    assert_redirected_to root_path
+  end
+end
diff --git a/test/controllers/sessions_controller_test.rb b/test/controllers/sessions_controller_test.rb
new file mode 100644
index 0000000..01a8465
--- /dev/null
+++ b/test/controllers/sessions_controller_test.rb
@@ -0,0 +1,105 @@
+require "test_helper"
+
+class SessionsControllerTest < ActionDispatch::IntegrationTest
+  test "should get login page" do
+    get login_path
+    assert_response :success
+    assert_select "h1", "Sign in"
+    assert_select "input[type=email]"
+    assert_select "input[type=password]"
+  end
+
+  test "should redirect to admin if already logged in as admin" do
+    login_as(users(:admin_user))
+    get login_path
+    assert_redirected_to admin_root_path
+  end
+
+  test "should redirect to root if already logged in as non-admin" do
+    login_as(users(:contributor_user))
+    get login_path
+    assert_redirected_to root_path
+  end
+
+  test "should login with valid credentials" do
+    post login_path, params: {
+      email: "admin@example.com",
+      password: "password123456"
+    }
+
+    assert_redirected_to admin_root_path
+    assert_equal users(:admin_user).id, session[:user_id]
+    follow_redirect!
+    assert_select ".bg-green-50", /Welcome back/
+  end
+
+  test "should login contributor and redirect to root" do
+    post login_path, params: {
+      email: "contributor@example.com",
+      password: "password123456"
+    }
+
+    assert_redirected_to root_path
+    assert_equal users(:contributor_user).id, session[:user_id]
+  end
+
+  test "should not login with invalid email" do
+    post login_path, params: {
+      email: "nonexistent@example.com",
+      password: "password123456"
+    }
+
+    assert_response :unprocessable_entity
+    assert_nil session[:user_id]
+    assert_select ".bg-red-50", /Invalid email or password/
+  end
+
+  test "should not login with invalid password" do
+    post login_path, params: {
+      email: "admin@example.com",
+      password: "wrongpassword"
+    }
+
+    assert_response :unprocessable_entity
+    assert_nil session[:user_id]
+    assert_select ".bg-red-50", /Invalid email or password/
+  end
+
+  test "should handle email with whitespace and case insensitivity" do
+    post login_path, params: {
+      email: "  ADMIN@EXAMPLE.COM  ",
+      password: "password123456"
+    }
+
+    assert_redirected_to admin_root_path
+    assert_equal users(:admin_user).id, session[:user_id]
+  end
+
+  test "should not login user with pending invitation" do
+    post login_path, params: {
+      email: "pending@example.com",
+      password: "password123456"
+    }
+
+    assert_response :unprocessable_entity
+    assert_nil session[:user_id]
+    assert_select ".bg-red-50", /Your account is pending/
+  end
+
+  test "should logout and redirect to root" do
+    login_as(users(:admin_user))
+
+    delete logout_path
+
+    assert_redirected_to root_path
+    assert_nil session[:user_id]
+    assert_equal "You have been logged out.", flash[:notice]
+  end
+
+  test "should logout even when not logged in" do
+    delete logout_path
+
+    assert_redirected_to root_path
+    assert_nil session[:user_id]
+  end
+end
diff --git a/test/controllers/setup_controller_test.rb b/test/controllers/setup_controller_test.rb
new file mode 100644
index 0000000..203b785
--- /dev/null
+++ b/test/controllers/setup_controller_test.rb
@@ -0,0 +1,100 @@
+require "test_helper"
+
+class SetupControllerTest < ActionDispatch::IntegrationTest
+  def setup
+    SetupState.reset!
+  end
+
+  def teardown
+    SetupState.reset!
+  end
+
+  test "should show setup page when not installed" do
+    get setup_path
+    assert_response :success
+    assert_select "h2", /Create Admin Account/
+  end
+
+  test "should redirect to root when already installed" do
+    SetupState.mark_installed!
+
+    get setup_path
+    assert_redirected_to root_path
+    assert_equal "Setup has already been completed.", flash[:alert]
+  end
+
+  test "should create admin user and mark as installed" do
+    assert_difference("User.count", 1) do
+      post setup_path, params: {
+        user: {
+          email: "setupadmin@example.com",
+          name: "Setup Admin",
+          password: "securepassword123",
+          password_confirmation: "securepassword123",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert SetupState.installed?
+
+    new_user = User.find_by(email: "setupadmin@example.com")
+    assert_not_nil new_user
+    assert_equal "admin", new_user.role
+    assert_not_nil new_user.invitation_accepted_at
+    assert_equal new_user.id, session[:user_id]
+
+    assert_redirected_to admin_root_path
+  end
+
+  test "should not create user with invalid password" do
+    assert_no_difference("User.count") do
+      post setup_path, params: {
+        user: {
+          email: "setupadmin@example.com",
+          name: "Setup Admin",
+          password: "short",  # Too short, minimum is 12
+          password_confirmation: "short",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_not SetupState.installed?
+    assert_response :unprocessable_entity
+  end
+
+  test "should not create user with mismatched passwords" do
+    assert_no_difference("User.count") do
+      post setup_path, params: {
+        user: {
+          email: "setupadmin@example.com",
+          name: "Setup Admin",
+          password: "securepassword123",
+          password_confirmation: "differentpassword",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_not SetupState.installed?
+    assert_response :unprocessable_entity
+  end
+
+  test "should not create user without email" do
+    assert_no_difference("User.count") do
+      post setup_path, params: {
+        user: {
+          email: "",
+          name: "Setup Admin",
+          password: "securepassword123",
+          password_confirmation: "securepassword123",
+          primary_language: "en"
+        }
+      }
+    end
+
+    assert_not SetupState.installed?
+    assert_response :unprocessable_entity
+  end
+end
diff --git a/test/fixtures/comments.yml b/test/fixtures/comments.yml
index 4baff9a..7790e09 100644
--- a/test/fixtures/comments.yml
+++ b/test/fixtures/comments.yml
@@ -1,13 +1,13 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
 
 one:
-  user: one
+  user: admin_user
   commentable: one
   commentable_type: Commentable
   body: MyText
 
 two:
-  user: two
+  user: contributor_user
   commentable: two
   commentable_type: Commentable
   body: MyText
diff --git a/test/fixtures/entries.yml b/test/fixtures/entries.yml
index 9c18750..f427c21 100644
--- a/test/fixtures/entries.yml
+++ b/test/fixtures/entries.yml
@@ -10,8 +10,8 @@ one:
   de: MyString
   notes: MyText
   verified: false
-  created_by: one
-  updated_by: one
+  created_by: admin_user
+  updated_by: admin_user
 
 two:
   category: 1
@@ -23,5 +23,5 @@ two:
   de: MyString
   notes: MyText
   verified: false
-  created_by: two
-  updated_by: two
+  created_by: contributor_user
+  updated_by: contributor_user
diff --git a/test/fixtures/entry_versions.yml b/test/fixtures/entry_versions.yml
index 111d6de..990451b 100644
--- a/test/fixtures/entry_versions.yml
+++ b/test/fixtures/entry_versions.yml
@@ -2,12 +2,12 @@
 
 one:
   entry: one
-  user: one
+  user: admin_user
   changes_made: "{}"
   change_type: MyString
 
 two:
   entry: two
-  user: two
+  user: contributor_user
   changes_made: "{}"
   change_type: MyString
diff --git a/test/fixtures/suggested_meanings.yml b/test/fixtures/suggested_meanings.yml
index 7c5dc30..baedaac 100644
--- a/test/fixtures/suggested_meanings.yml
+++ b/test/fixtures/suggested_meanings.yml
@@ -9,7 +9,7 @@ one:
   source: MyString
   region: MyString
   status: :pending
-  submitted_by: one
+  submitted_by: contributor_user
 
 two:
   entry: two
@@ -20,4 +20,4 @@ two:
   source: MyString
   region: MyString
   status: :pending
-  submitted_by: two
+  submitted_by: contributor_user
diff --git a/test/fixtures/users.yml b/test/fixtures/users.yml
index 7a9decc..d81a52d 100644
--- a/test/fixtures/users.yml
+++ b/test/fixtures/users.yml
@@ -1,23 +1,46 @@
 # Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+# Password for all test users: "password123456"
 
-one:
-  email: "one@example.com"
-  password_digest: <%= BCrypt::Password.create('password') %>
-  name: "User One"
-  role: 1
+admin_user:
+  email: "admin@example.com"
+  password_digest: <%= BCrypt::Password.create('password123456') %>
+  name: "Admin User"
+  role: 2  # admin
   primary_language: "en"
-  invitation_token: "one"
-  invitation_sent_at: 2026-01-22 13:38:37
-  invitation_accepted_at: 2026-01-22 13:38:37
-  invited_by: one
+  invitation_token: "admin_token_accepted"
+  invitation_sent_at: <%= 30.days.ago %>
+  invitation_accepted_at: <%= 30.days.ago %>
+  invited_by_id: ~
 
-two:
-  email: "two@example.com"
-  password_digest: <%= BCrypt::Password.create('password') %>
-  name: "User Two"
-  role: 1
+reviewer_user:
+  email: "reviewer@example.com"
+  password_digest: <%= BCrypt::Password.create('password123456') %>
+  name: "Reviewer User"
+  role: 1  # reviewer
+  primary_language: "en"
+  invitation_token: "reviewer_token_accepted"
+  invitation_sent_at: <%= 20.days.ago %>
+  invitation_accepted_at: <%= 20.days.ago %>
+  invited_by: admin_user
+
+contributor_user:
+  email: "contributor@example.com"
+  password_digest: <%= BCrypt::Password.create('password123456') %>
+  name: "Contributor User"
+  role: 0  # contributor
   primary_language: "fi"
-  invitation_token: "two"
-  invitation_sent_at: 2026-01-22 13:38:37
-  invitation_accepted_at: 2026-01-22 13:38:37
-  invited_by: two
+  invitation_token: "contributor_token_accepted"
+  invitation_sent_at: <%= 10.days.ago %>
+  invitation_accepted_at: <%= 10.days.ago %>
+  invited_by: admin_user
+
+pending_invitation:
+  email: "pending@example.com"
+  password_digest: <%= BCrypt::Password.create('password123456') %>
+  name: "Pending User"
+  role: 0  # contributor
+  primary_language: "en"
+  invitation_token: "pending_token_12345"
+  invitation_sent_at: <%= 2.days.ago %>
+  invitation_accepted_at: ~
+  invited_by: admin_user
diff --git a/test/models/comment_test.rb b/test/models/comment_test.rb
index 4734d51..f98117c 100644
--- a/test/models/comment_test.rb
+++ b/test/models/comment_test.rb
@@ -2,14 +2,14 @@ require "test_helper"
 
 class CommentTest < ActiveSupport::TestCase
   test "should be valid with a user, body, and commentable" do
-    user = users(:one)
+    user = users(:admin_user)
     entry = entries(:one)
     comment = Comment.new(user: user, body: "This is a comment.", commentable: entry)
     assert comment.valid?
   end
 
   test "should be invalid without a body" do
-    user = users(:one)
+    user = users(:admin_user)
     entry = entries(:one)
     comment = Comment.new(user: user, commentable: entry)
     assert_not comment.valid?
@@ -22,7 +22,7 @@ class CommentTest < ActiveSupport::TestCase
   end
 
   test "should be invalid without a commentable" do
-    user = users(:one)
+    user = users(:admin_user)
     comment = Comment.new(user: user, body: "This is a comment.")
     assert_not comment.valid?
   end
diff --git a/test/models/entry_version_test.rb b/test/models/entry_version_test.rb
index 67f0c6e..00a40bb 100644
--- a/test/models/entry_version_test.rb
+++ b/test/models/entry_version_test.rb
@@ -4,7 +4,7 @@ class EntryVersionTest < ActiveSupport::TestCase
   test "should be valid with all attributes" do
     version = EntryVersion.new(
       entry: entries(:one),
-      user: users(:one),
+      user: users(:admin_user),
       changes_made: { "fi" => "uusi sana" }
     )
     assert version.valid?
@@ -13,14 +13,14 @@ class EntryVersionTest < ActiveSupport::TestCase
   test "should be invalid without changes_made" do
     version = EntryVersion.new(
       entry: entries(:one),
-      user: users(:one)
+      user: users(:admin_user)
     )
     assert_not version.valid?
   end
 
   test "should be invalid without an entry" do
     version = EntryVersion.new(
-      user: users(:one),
+      user: users(:admin_user),
       changes_made: { "fi" => "uusi sana" }
     )
     assert_not version.valid?
diff --git a/test/models/suggested_meaning_test.rb b/test/models/suggested_meaning_test.rb
index f37ae13..43273fc 100644
--- a/test/models/suggested_meaning_test.rb
+++ b/test/models/suggested_meaning_test.rb
@@ -6,7 +6,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
       entry: entries(:one),
       language_code: supported_languages(:one).code,
       alternative_translation: "New Translation",
-      submitted_by: users(:one)
+      submitted_by: users(:contributor_user)
     )
     assert meaning.valid?
   end
@@ -15,7 +15,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
     meaning = SuggestedMeaning.new(
       entry: entries(:one),
       alternative_translation: "New Translation",
-      submitted_by: users(:one)
+      submitted_by: users(:contributor_user)
     )
     assert_not meaning.valid?
   end
@@ -24,7 +24,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
     meaning = SuggestedMeaning.new(
       entry: entries(:one),
       language_code: supported_languages(:one).code,
-      submitted_by: users(:one)
+      submitted_by: users(:contributor_user)
     )
     assert_not meaning.valid?
   end
@@ -34,7 +34,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
       entry: entries(:one),
       language_code: supported_languages(:one).code,
       alternative_translation: "New Translation",
-      submitted_by: users(:one)
+      submitted_by: users(:contributor_user)
     )
     assert meaning.pending?
   end
@@ -44,7 +44,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
       entry: entries(:one),
       language_code: supported_languages(:one).code,
       alternative_translation: "New Translation",
-      submitted_by: users(:one),
+      submitted_by: users(:contributor_user),
       status: :accepted
     )
     assert meaning.accepted?
@@ -55,7 +55,7 @@ class SuggestedMeaningTest < ActiveSupport::TestCase
       entry: entries(:one),
       language_code: supported_languages(:one).code,
       alternative_translation: "New Translation",
-      submitted_by: users(:one),
+      submitted_by: users(:contributor_user),
       status: :rejected
     )
     assert meaning.rejected?
diff --git a/test/models/supported_language_test.rb b/test/models/supported_language_test.rb
index 8af3b75..51ec028 100644
--- a/test/models/supported_language_test.rb
+++ b/test/models/supported_language_test.rb
@@ -2,13 +2,12 @@ require "test_helper"
 
 class SupportedLanguageTest < ActiveSupport::TestCase
   test "should be valid with all attributes" do
-    language = SupportedLanguage.new(code: "es", name: "Spanish", native_name: "Español")
+    language = SupportedLanguage.new(code: "sv", name: "Swedish", native_name: "Svenska")
     assert language.valid?
   end
 
   test "should be invalid with a duplicate code" do
-    SupportedLanguage.create(code: "de", name: "German", native_name: "Deutsch")
-    language = SupportedLanguage.new(code: "de", name: "German", native_name: "Deutsch")
+    language = SupportedLanguage.new(code: supported_languages(:one).code, name: "English", native_name: "English")
     assert_not language.valid?
   end
 end
diff --git a/test/models/user_test.rb b/test/models/user_test.rb
index f8b7c32..a9fb035 100644
--- a/test/models/user_test.rb
+++ b/test/models/user_test.rb
@@ -2,7 +2,7 @@ require "test_helper"
 
 class UserTest < ActiveSupport::TestCase
   test "should be valid with an email and password" do
-    user = User.new(email: "test@example.com", password: "password123456")
+    user = User.new(email: "new-user@example.com", password: "password123456")
     assert user.valid?
   end
 
@@ -12,23 +12,23 @@ class UserTest < ActiveSupport::TestCase
   end
 
   test "should be invalid with a duplicate email" do
-    User.create(email: "test@example.com", password: "password123456")
-    user = User.new(email: "test@example.com", password: "password123456")
+    existing_user = users(:admin_user)
+    user = User.new(email: existing_user.email, password: "password123456")
     assert_not user.valid?
   end
 
   test "should have a default role of contributor" do
-    user = User.new(email: "test@example.com", password: "password123456")
+    user = User.new(email: "new-user@example.com", password: "password123456")
     assert user.contributor?
   end
 
   test "can be a reviewer" do
-    user = User.new(email: "test@example.com", password: "password123456", role: :reviewer)
+    user = User.new(email: "new-user@example.com", password: "password123456", role: :reviewer)
     assert user.reviewer?
   end
 
   test "can be an admin" do
-    user = User.new(email: "test@example.com", password: "password123456", role: :admin)
+    user = User.new(email: "new-user@example.com", password: "password123456", role: :admin)
     assert user.admin?
   end
 
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 0c22470..615a5e7 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -4,8 +4,8 @@ require "rails/test_help"
 
 module ActiveSupport
   class TestCase
-    # Run tests in parallel with specified workers
-    parallelize(workers: :number_of_processors)
+    # Run tests serially to avoid sqlite/FTS5 conflicts in test setup.
+    parallelize(workers: 1)
 
     # Setup all fixtures in test/fixtures/*.yml for all tests in alphabetical order.
     fixtures :all
@@ -13,3 +13,20 @@ module ActiveSupport
     # Add more helper methods to be used by all tests here...
   end
 end
+
+module ActionDispatch
+  class IntegrationTest
+    # Helper method to login as a user in integration tests
+    def login_as(user, password: "password123456")
+      post login_path, params: {
+        email: user.email,
+        password: password
+      }
+    end
+
+    # Helper method to logout
+    def logout
+      delete logout_path
+    end
+  end
+end