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# hybrid_solver_test.py

Here's a comprehensive documentation for the target file `test/solver_tests/hybrid_solver_test.py`:

## High-level description

This file contains unit tests for the HybridSolver class in Cassiopeia's solver module. It tests various aspects of the hybrid solver, including its constructor, cutoff assessment, top-down splitting, and full solving capabilities for different scenarios (small trees, large trees, trees with missing data).

## Code Structure

The main class `TestHybridSolver` inherits from `unittest.TestCase` and contains multiple test methods. It sets up test data in the `setUp` method and cleans up in the `tearDown` method. The tests cover different aspects of the HybridSolver's functionality, including its initialization, cutoff assessment, top-down splitting, and full solving capabilities.

## Symbols

### TestHybridSolver

#### Description

A test class that inherits from `unittest.TestCase` and contains multiple test methods for the HybridSolver class.

#### Internal Logic

1. Sets up test data in `setUp` method
2. Defines various test methods to check different aspects of HybridSolver
3. Cleans up test files in `tearDown` method

### find\_triplet\_structure

#### Description

A helper function that finds the structure of a triplet in a given tree.

#### Inputs

| Name    | Type             | Description                 |
| :------ | :--------------- | :-------------------------- |
| triplet | tuple            | A tuple of three node names |
| T       | networkx.DiGraph | The tree to analyze         |

#### Outputs

| Name      | Type | Description                                             |
| :-------- | :--- | :------------------------------------------------------ |
| structure | str  | The structure of the triplet ("ab", "ac", "bc", or "-") |

#### Internal Logic

1. Finds ancestors for each node in the triplet
2. Compares the number of common ancestors between pairs
3. Returns the structure based on which pair has the most common ancestors

### TestHybridSolver.setUp

#### Description

Sets up the test environment by creating test data and initializing HybridSolver instances.

### TestHybridSolver.test\_constructor

#### Description

Tests the constructor of the HybridSolver class.

### TestHybridSolver.test\_cutoff

#### Description

Tests the cutoff assessment functionality of the HybridSolver.

### TestHybridSolver.test\_top\_down\_split\_manual

#### Description

Manually tests the top-down splitting functionality of the HybridSolver.

### TestHybridSolver.test\_apply\_top\_solver\_small

#### Description

Tests the application of the top solver on a small dataset.

### TestHybridSolver.test\_apply\_top\_solver\_large

#### Description

Tests the application of the top solver on a large dataset.

### TestHybridSolver.test\_apply\_top\_solver\_missing

#### Description

Tests the application of the top solver on a dataset with missing data.

### TestHybridSolver.test\_full\_hybrid

#### Description

Tests the full hybrid solving process on a small dataset.

### TestHybridSolver.test\_full\_hybrid\_single\_thread

#### Description

Tests the full hybrid solving process using a single thread.

### TestHybridSolver.test\_full\_hybrid\_large

#### Description

Tests the full hybrid solving process on a large dataset.

### TestHybridSolver.test\_full\_hybrid\_maxcut

#### Description

Tests the full hybrid solving process using the MaxCut greedy solver.

### TestHybridSolver.test\_full\_hybrid\_missing

#### Description

Tests the full hybrid solving process on a dataset with missing data.

### TestHybridSolver.test\_greedy\_over\_greedy\_maxcut\_missing

#### Description

Tests the hybrid solver using a greedy solver over a greedy MaxCut solver on a dataset with missing data.

## Dependencies

| Dependency | Purpose                             |
| :--------- | :---------------------------------- |
| unittest   | Provides testing framework          |
| itertools  | Used for generating combinations    |
| networkx   | Used for graph operations           |
| pandas     | Used for data manipulation          |
| pathlib    | Used for file path operations       |
| cassiopeia | The main package being tested       |
| gurobipy   | Optional dependency for ILP solving |

## Error Handling

The tests use assertions provided by the `unittest` framework to check for expected behaviors and results. Some tests are skipped if Gurobi is not installed using the `@unittest.skipUnless` decorator.

## Logging

The tests create log files during execution, which are cleaned up in the `tearDown` method.

## TODOs

None explicitly mentioned in the code.

This documentation provides a comprehensive overview of the test file for the HybridSolver in Cassiopeia. It covers the main test class, its methods, and the helper function used in the tests. The documentation also includes information about dependencies, error handling, and logging practices used in the test suite.