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//! # Set Theory Integration Tests
//!
//! Comprehensive test suite for the Set Theory library.
//!
//! This module organizes all integration tests into logical groups:
//! - `custom_set_tests`: Tests for CustomSet data structure
//! - `multiset_tests`: Tests for MultiSet (bag) data structure
//! - `operations_tests`: Tests for basic and advanced set operations
//! - `laws_tests`: Tests for set theory law verification
//!
//! ## Test Organization
//!
//! Tests are grouped by functionality to ensure:
//! - Clear test discovery and execution
//! - Easy maintenance and extension
//! - Comprehensive coverage of all features
//!
//! ## Running Tests
//!
//! ```bash
//! # Run all tests
//! cargo test
//!
//! # Run specific test module
//! cargo test custom_set_tests
//!
//! # Run with output
//! cargo test -- --nocapture
//!
//! # Run with coverage
//! cargo tarpaulin --out Html
//! ```
//!
//! ## Test Categories
//!
//! | Module | Purpose | Test Count |
//! |--------|---------|------------|
//! | `custom_set_tests` | Core set functionality | 25+ |
//! | `multiset_tests` | Multiset operations | 15+ |
//! | `operations_tests` | Set operations | 20+ |
//! | `laws_tests` | Law verification | 20+ |
//!
//! ## Example
//!
//! ```bash
//! # Run all tests with verbose output
//! cargo test -- --test-threads=1 --nocapture
//! ```