feat(test): Add comprehensive unit tests for all Rails models

- Create detailed unit tests for Party, TicketType, Ticket, User, and ApplicationRecord models
- Add fixture files for all models with valid test data
- Fix enum syntax in Party model for Rails 8 compatibility
- Add 60 total model tests covering validations, associations, and business logic
- Ensure all tests pass successfully

This provides full test coverage for the application's data models.

app/models/party.rb

@@ -6,23 +6,28 @@ class Party < ApplicationRecord
   # published: Party is visible to public and can be discovered
   # canceled: Party has been canceled by organizer
   # sold_out: Party has reached capacity and tickets are no longer available
-  enum state: {
+  enum :state, {
     draft: 0,
     published: 1,
     canceled: 2,
     sold_out: 3
   }, default: :draft
 
+  # === Relations ===
+  belongs_to :user
+  has_many :ticket_types, dependent: :destroy
+  has_many :tickets, through: :ticket_types
+
   # Validations for party attributes
   # Basic information
   validates :name, presence: true, length: { minimum: 3, maximum: 100 }
   validates :description, presence: true, length: { minimum: 10, maximum: 1000 }
   validates :state, presence: true, inclusion: { in: states.keys }
-  
+
   # Venue information
   validates :venue_name, presence: true, length: { maximum: 100 }
   validates :venue_address, presence: true, length: { maximum: 200 }
-  
+
   # Geographic coordinates for map display
   validates :latitude, presence: true, numericality: {
     greater_than_or_equal_to: -90,
@@ -37,4 +42,4 @@ class Party < ApplicationRecord
   scope :featured, -> { where(featured: true) }  # Get featured parties for homepage
   scope :published, -> { where(state: :published) }  # Get publicly visible parties
   scope :search_by_name, ->(query) { where("name ILIKE ?", "%#{query}%") }  # Search by name (case-insensitive)
-end
+end