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.

test/models/party_test.rb

@@ -0,0 +1,137 @@
+require "test_helper"
+
+class PartyTest < ActiveSupport::TestCase
+  # Test that Party model exists
+  test "should be a class" do
+    assert_kind_of Class, Party
+  end
+
+  # Test validations
+  test "should not save party without name" do
+    party = Party.new(description: "Test party description")
+    assert_not party.save
+  end
+
+  test "should not save party without description" do
+    party = Party.new(name: "Test Party")
+    assert_not party.save
+  end
+
+  test "should not save party with name less than 3 characters" do
+    party = Party.new(name: "AB", description: "Valid description for the party")
+    assert_not party.save
+  end
+
+  test "should not save party with description less than 10 characters" do
+    party = Party.new(name: "Valid Party Name", description: "Too short")
+    assert_not party.save
+  end
+
+  test "should not save party without latitude" do
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      longitude: 2.3522
+    )
+    assert_not party.save
+  end
+
+  test "should not save party without longitude" do
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      latitude: 48.8566
+    )
+    assert_not party.save
+  end
+
+  test "should not save party with invalid latitude" do
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      latitude: 95.0,
+      longitude: 2.3522,
+      venue_name: "Test Venue",
+      venue_address: "123 Test Street"
+    )
+    assert_not party.save
+  end
+
+  test "should not save party with invalid longitude" do
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      latitude: 48.8566,
+      longitude: 190.0,
+      venue_name: "Test Venue",
+      venue_address: "123 Test Street"
+    )
+    assert_not party.save
+  end
+
+  test "should save valid party" do
+    user = User.create!(
+      email: "test@example.com",
+      password: "password123",
+      password_confirmation: "password123"
+    )
+    
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      latitude: 48.8566,
+      longitude: 2.3522,
+      venue_name: "Test Venue",
+      venue_address: "123 Test Street",
+      user: user
+    )
+    assert party.save
+  end
+
+  # Test enum states
+  test "should have valid states" do
+    assert_equal %w[draft published canceled sold_out], Party.states.keys
+  end
+
+  test "should default to draft state" do
+    party = Party.new(
+      name: "Valid Party Name", 
+      description: "Valid description for the party that is long enough",
+      latitude: 48.8566,
+      longitude: 2.3522,
+      venue_name: "Test Venue",
+      venue_address: "123 Test Street"
+    )
+    assert_equal "draft", party.state
+  end
+
+  # Test associations
+  test "should belong to user" do
+    association = Party.reflect_on_association(:user)
+    assert_equal :belongs_to, association.macro
+  end
+
+  test "should have many ticket_types" do
+    association = Party.reflect_on_association(:ticket_types)
+    assert_equal :has_many, association.macro
+  end
+
+  test "should have many tickets through ticket_types" do
+    association = Party.reflect_on_association(:tickets)
+    assert_equal :has_many, association.macro
+    assert_equal :ticket_types, association.options[:through]
+  end
+
+  # Test scopes
+  test "should respond to featured scope" do
+    assert_respond_to Party, :featured
+  end
+
+  test "should respond to published scope" do
+    assert_respond_to Party, :published
+  end
+
+  test "should respond to search_by_name scope" do
+    assert_respond_to Party, :search_by_name
+  end
+end