Implement getIterator() method in GetIterator trait / Issue #105

[atournayre]

Summary

Implements the getIterator() method in GetIterator trait to enable collections to be iterable in foreach loops, fixing issue #105.

Changes

Implementation:

• Implement getIterator(): \Traversable delegating to $this->collection->getIterator()
• Return type annotation: \Traversable<array-key, mixed>
• Remove RuntimeException placeholder ("Not implemented yet!")
• Clean unused imports (RuntimeException, ThrowableInterface)

Tests added:

• testGetIteratorReturnsTraversable - Verifies return type
• testGetIteratorAllowsForeach - Tests foreach iteration
• testGetIteratorWithEmptyCollection - Empty collection handling
• testGetIteratorPreservesKeys - Key preservation validation
• testGetIteratorWithNestedArrays - Nested arrays support

Files:

• src/Primitives/Traits/Collection/GetIterator.php (modified)
• tests/Unit/Primitives/Traits/Collection/GetIteratorTest.php (new)

Testing

• ✅ PHP syntax validated
• ✅ 5 unit tests created (execution requires PHP 8.2+ env)
• ✅ Tests cover: Traversable return, foreach, empty collection, key preservation, nested arrays

Checklist

• Code follows project standards
• Tests added/updated
• Documentation updated (docblock)

Fixes #105

[atournayre]

🔍 Automated Code Review

✅ Positive points

Implementation:

• Clean delegation to $this->collection->getIterator()
• Proper return type \Traversable with generic annotation
• Removed placeholder RuntimeException
• Cleaned unused imports

Tests:

• Comprehensive coverage (5 test cases)
• Tests key scenarios: Traversable type, foreach, empty, keys, nested arrays
• Clear test naming following project conventions

Code quality:

• Follows Elegant Objects principles
• Minimal method implementation (delegation pattern)
• Complete docblock with @return annotation

📝 Suggestions (non-blocking)

Testing:

• Consider adding test for immutable collections (asReadOnly())
• Could test with different iterator types (numeric vs associative keys)

Documentation:

• Example usage in trait docblock would be helpful

✅ Validation

Code ready to merge. Solves RuntimeException issue. Collections now properly iterable in foreach loops.