Added user model, simple tests and db migration

Gemfile

@@ -35,6 +35,9 @@ gem "thruster", require: false
 # Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin Ajax possible
 # gem "rack-cors"
 
+# BCrypt for password hashing
+gem "bcrypt", "~> 3.1"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"
@@ -43,7 +46,8 @@ group :development, :test do
   gem "brakeman", require: false
 
   # Testing Framework
-  gem "minitest", "~> 6.0"
+  # Minitest 6.0+ is having some issues with how tests are currently written
+  gem "minitest", "~> 5.0"
   gem "minitest-reporters"
 
   # Omakase Ruby styling [https://github.com/rails/rubocop-rails-omakase/]

Gemfile.lock

@@ -78,6 +78,7 @@ GEM
     ansi (1.5.0)
     ast (2.4.3)
     base64 (0.3.0)
+    bcrypt (3.1.21)
     bcrypt_pbkdf (1.1.2)
     bigdecimal (4.0.1)
     bootsnap (1.20.1)
@@ -137,8 +138,7 @@ GEM
       net-smtp
     marcel (1.1.0)
     mini_mime (1.1.5)
-    minitest (6.0.1)
-      prism (~> 1.5)
+    minitest (5.27.0)
     minitest-reporters (1.7.1)
       ansi
       builder
@@ -323,11 +323,12 @@ PLATFORMS
   x86_64-linux-musl
 
 DEPENDENCIES
+  bcrypt (~> 3.1)
   bootsnap
   brakeman
   debug
   kamal
-  minitest (~> 6.0)
+  minitest (~> 5.0)
   minitest-reporters
   pg (~> 1.6)
   puma (>= 5.0)

Makefile

@@ -1,3 +1,4 @@
+.PHONY: up down logs build test run
 up:
 	@docker-compose -f docker-compose.yml up -d
 down:
@@ -6,5 +7,7 @@ logs:
 	@docker-compose -f docker-compose.yml logs -f
 build:
 	@docker build --build-arg RAILS_MASTER_KEY=$(cat config/master.key) -f Dockerfile -t simplesave-api:latest .
+test:
+	@rails test
 run:
-	@rails s
+	@rails server

app/models/user.rb

@@ -0,0 +1,5 @@
+class User < ApplicationRecord
+  has_secure_password
+
+  validates :email, presence: true, uniqueness: true
+end

db/migrate/20260108050125_create_users.rb

@@ -0,0 +1,10 @@
+class CreateUsers < ActiveRecord::Migration[8.1]
+  def change
+    create_table :users do |t|
+      t.string :email, null: false, index: { unique: true }
+      t.string :password_digest, null: false
+
+      t.timestamps
+    end
+  end
+end

test/fixtures/users.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+alice:
+  email: alice@example.com
+  password_digest: <%= BCrypt::Password.create(TestCredentials::DEFAULT_PASSWORD) %>
+
+bob:
+  email: bob@example.com
+  password_digest: <%= BCrypt::Password.create(TestCredentials::DEFAULT_PASSWORD) %>

test/models/user_test.rb

@@ -0,0 +1,55 @@
+require "test_helper"
+
+class UserTest < ActiveSupport::TestCase
+  test "is valid with email and password" do
+    user = User.new(
+      email: "newuser@example.com",
+      password: TestCredentials::DEFAULT_PASSWORD,
+      password_confirmation: TestCredentials::DEFAULT_PASSWORD
+    )
+
+    assert user.valid?
+  end
+
+  test "is invalid without email" do
+    user = User.new(
+      password: TestCredentials::DEFAULT_PASSWORD,
+      password_confirmation: TestCredentials::DEFAULT_PASSWORD
+    )
+
+    assert_not user.valid?
+    assert_includes user.errors[:email], "can't be blank"
+  end
+
+  test "is invalid without password" do
+    user = User.new(email: "nopassword@example.com")
+
+    assert_not user.valid?
+    assert_includes user.errors[:password], "can't be blank"
+  end
+
+  test "email must be unique" do
+    existing_user = users(:alice)
+
+    duplicate = User.new(
+      email: existing_user.email,
+      password: TestCredentials::DEFAULT_PASSWORD,
+      password_confirmation: TestCredentials::DEFAULT_PASSWORD
+    )
+
+    assert_not duplicate.valid?
+    assert_includes duplicate.errors[:email], "has already been taken"
+  end
+
+  test "authenticates with correct password" do
+    user = users(:alice)
+
+    assert user.authenticate(TestCredentials::DEFAULT_PASSWORD)
+  end
+
+  test "does not authenticate with incorrect password" do
+    user = users(:alice)
+
+    assert_not user.authenticate("wrong-password")
+  end
+end

test/support/auth_constants.rb

@@ -0,0 +1,3 @@
+module TestCredentials
+  DEFAULT_PASSWORD = "password123"
+end

test/test_helper.rb

@@ -5,6 +5,11 @@
 require "minitest/reporters"
 Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
 
+require "bcrypt"
+
+# Load support file:
+Dir[Rails.root.join("test/support/**/*.rb")].each { |f| require f }
+
 module ActiveSupport
   class TestCase
     # Run tests in parallel with specified workers