[WIP] Add comprehensive tests for HasMany relationship feature

[Copilot]

• Review existing HasMany test implementation in RelationTests.cpp
• Create comprehensive test case "HasMany - Complete relationship tests"
• Add test section for IsEmpty() - both empty and non-empty scenarios
• Add test section for All() - retrieve and verify all related records
• Add test section for operator[] - array-style access
• Add test section for iterator support - range-based for loops
• Add test section for lazy loading behavior - verify on-demand loading
• Add test section for multiple queries - verify caching works correctly
• Build and run the new tests to verify they pass
• Run all DataMapper relation tests to ensure no regressions

Original prompt

Problem Statement

Add comprehensive tests for the HasMany relationship feature in the DataMapper to ensure all functionality is properly tested.

Background

The HasMany relationship is implemented in src/Lightweight/DataMapper/HasMany.hpp and provides one-to-many relationship support between records. While there is an existing test in src/tests/DataMapper/RelationTests.cpp (starting at line 103), it only covers basic functionality like Count() and At(). We need comprehensive test coverage for all HasMany methods.

Requirements

Create a comprehensive test case in src/tests/DataMapper/RelationTests.cpp that tests all HasMany functionality:

1. Count() - Verify counting related records works correctly
2. IsEmpty() - Test both empty and non-empty scenarios
3. All() - Retrieve and verify all related records
4. At(index) - Access by index with proper validation
5. operator[] - Array-style access to records
6. Each() - Iteration with callback function
7. Iterator support - Verify range-based for loops work
8. Lazy loading - Ensure on-demand loading behavior
9. Multiple queries - Verify caching works correctly for repeated access

Implementation Details

• Use the existing User and Email entities defined in src/tests/DataMapper/Entities.hpp
• Follow the existing test patterns in RelationTests.cpp
• Use TEST_CASE_METHOD(SqlTestFixture, ...) macro
• Group related assertions using SECTION() blocks
• Test name should be: "HasMany - Complete relationship tests"
• Test tags should be: "[DataMapper][relations][HasMany]"

Test Data Setup

The test should:

• Create a user with 3 email addresses
• Create another user with 1 email address (to verify filtering)
• Verify that relationships are properly isolated between users

Success Criteria

• All HasMany API methods are tested
• Tests pass on all supported database backends (SQLite, SQL Server)
• Code follows existing test patterns and style
• Test coverage increases for the HasMany relationship feature

This pull request was created from Copilot chat.

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