feat: add comprehensive unit tests for bittensor.core.types module

[codomposer]

Add Comprehensive Unit Tests for bittensor/core/types.py

Description of the Change

This PR adds comprehensive unit test coverage for the bittensor/core/types.py module, which contains fundamental type definitions and mixins used throughout the Bittensor codebase.

New test file: tests/unit_tests/test_types.py (608 lines, 23 tests)

Test Coverage Includes:

Type Annotations (3 tests)

• UIDs type validation (NDArray and list support)
• Weights type validation (NDArray and list support)
• Salt type validation (NDArray and list support)

SubtensorMixin (10 tests)

• String representations (__str__ and __repr__)
• Network settings logging for finney network
• Config creation and setup methods
• Argument parser integration with and without prefix
• Config precedence order validation
• Help method functionality

AxonServeCallParams (8 tests)

• Initialization with all parameters including Certificate
• Equality comparisons with dict, NeuronInfo, and NeuronInfoLite
• Copy method functionality
• Dictionary conversion with and without certificate
• Error handling for invalid comparison types

PrometheusServeCallParams (2 tests)

• TypedDict structure validation
• Type checking for all required fields

Test Results:

• ✅ 23 tests passing
• ⏭️ 1 test skipped (ParamWithTypes not found in codebase)
• 📊 73% code coverage of bittensor/core/types.py

Alternate Designs

Alternative approaches considered:

1. Separate test files per class - Decided against to keep related type tests together
2. Mock-heavy approach - Opted for concrete implementations where possible for better integration testing
3. Parametrized tests - Used explicit test functions for better readability and debugging

Possible Drawbacks

• None identified. This is purely additive test coverage with no changes to production code.
• Tests use mocking for logging and I/O operations to avoid side effects.

Verification Process

Test Execution:

# Run all tests
python -m pytest tests/unit_tests/test_types.py -v

# Run with coverage report
python -m pytest tests/unit_tests/test_types.py -v --cov=bittensor.core.types --cov-report=term-missing

Results:

• All 23 tests pass successfully
• No test failures or errors
• Tests run in ~0.18 seconds
• Coverage: 73% of bittensor/core/types.py

Verified Functionality:

1. ✅ Type annotations accept correct data types
2. ✅ SubtensorMixin methods work as expected
3. ✅ Config setup and argument parsing functions correctly
4. ✅ AxonServeCallParams equality and serialization work properly
5. ✅ PrometheusServeCallParams structure is valid
6. ✅ All tests pass in virtual environment

Contribution by Gittensor, learn more at https://gittensor.io/