Unit Testing - Comprehensive test suite with mocked responses

[Haydart]

---

name: Unit Testing - Comprehensive test suite with mocked responses
status: open
created: 2025-09-19T16:02:24Z
updated: 2025-09-19T16:42:04Z
github: #128
depends_on: [127, 129, 125, 130, 126]
parallel: true
conflicts_with: []

Task #128: Unit Testing - Comprehensive test suite with mocked responses

Overview

Create a comprehensive unit test suite for the SolanaBlockchainService with fully mocked RPC responses. This task ensures all service methods, error handling, retry logic, and edge cases are thoroughly tested without requiring network connectivity or real blockchain data.

Scope

In Scope

• Complete Test Coverage: Unit tests for all SolanaBlockchainService public methods
• Mocked RPC Responses: Realistic mock data simulating successful and error scenarios
• Error Handling Tests: Validation of custom exception handling and retry logic
• Edge Case Coverage: Invalid addresses, empty responses, malformed data scenarios
• Data Model Validation: Testing dataclass serialization and field validation
• Configuration Tests: Environment variable handling and RPC client initialization

Out of Scope

• Real network calls or blockchain interaction (covered in integration testing)
• Performance testing or load testing scenarios
• UI or web interface testing

Technical Requirements

Test Structure

• pytest Framework: Use project's existing pytest configuration with proper test discovery
• Mock Strategy: Use unittest.mock for RPC client mocking with realistic response data
• Test Organization: Separate test files for different service method groups
• Fixture Management: Reusable pytest fixtures for common mock data and service instances

Test Categories

1. Service Initialization Tests

   • RPC client setup with valid/invalid URLs
   • Environment variable validation
   • Configuration error handling

2. Wallet Balance Tests

   • Successful balance retrieval with various SOL amounts
   • Non-existent wallet handling (None return)
   • Invalid address format error handling
   • RPC timeout and network error scenarios

3. Token Holdings Tests

   • Multiple token holdings parsing and metadata enrichment
   • Empty token account handling
   • Invalid mint address scenarios
   • Token metadata lookup failures

4. Transaction History Tests

   • Transaction list parsing with various transaction types
   • First funding transaction identification logic
   • Empty transaction history handling
   • Historical data pagination edge cases

5. Error Handling Tests

   • Custom exception propagation and message formatting
   • Retry logic validation with exponential backoff timing
   • Maximum retry limit enforcement
   • Network failure recovery scenarios

Mock Data Requirements

• Realistic Responses: Mock data matching actual Solana RPC response formats
• Error Scenarios: Proper HTTP error codes and RPC error message structures
• Edge Cases: Empty arrays, null values, malformed JSON responses
• Timing Simulation: Mock delays for retry logic testing

Implementation Details

Test File Structure

tests/unit/services/solana/
├── test_solana_blockchain_service.py          # Main service tests
├── test_solana_data_models.py                 # Dataclass validation tests
├── test_solana_exceptions.py                  # Exception handling tests
├── conftest.py                                # Pytest fixtures and mock data
└── fixtures/
    ├── mock_rpc_responses.py                  # RPC response mock data
    └── test_data.py                           # Test addresses and expected results

Key Test Scenarios

1. Happy Path Testing

   • Valid wallet with SOL balance and token holdings
   • Successful metadata retrieval for known tokens
   • Transaction history with identifiable funding transaction

2. Error Condition Testing

   • Invalid Solana address format validation
   • RPC endpoint unavailable or returning errors
   • Malformed response data handling
   • Timeout scenarios with retry behavior

3. Boundary Testing

   • Zero balance wallets
   • Maximum token holdings per wallet
   • Transaction history limit enforcement
   • Very large or very small numeric values

Assertion Strategy

• Type Checking: Verify return types match dataclass specifications
• Data Validation: Confirm parsed data matches expected structures
• Exception Matching: Exact exception type and message validation
• Mock Verification: Ensure proper RPC client method calls with correct parameters

Acceptance Criteria

Functional Requirements

• 100% Method Coverage: Every public SolanaBlockchainService method has comprehensive tests
• Error Path Coverage: All custom exceptions and retry scenarios are tested
• Mock Validation: All RPC interactions are properly mocked with realistic data
• Edge Case Handling: Invalid inputs, empty responses, and malformed data scenarios covered

Quality Standards

• Test Execution: All tests pass consistently with pytest runner
• Isolation: Each test is independent with proper setup/teardown
• Performance: Test suite completes within 30 seconds on standard hardware
• Maintainability: Clear test names and comprehensive docstrings for debugging

Documentation

• Test Documentation: Clear docstrings explaining test purpose and expected behavior
• Mock Data Documentation: Comments explaining mock response structures and scenarios
• Fixture Documentation: Reusable test fixtures with usage examples

Dependencies

• Core Service Implementation - SolanaBlockchainService class with RPC client setup #127: Core Service Implementation (SolanaBlockchainService class)
• Data Models - Dataclass definitions for all return types #129: Data Models (Dataclass definitions required for test validation)
• Error Handling - Custom exception classes and retry logic #124: Error Handling (Custom exceptions needed for error testing)
• Wallet Balance Query - SOL balance retrieval implementation #125: Wallet Balance Query (Balance retrieval logic for comprehensive testing)
• Transaction History - Transaction parsing and funding transaction identification #126: Transaction History (Transaction parsing logic for comprehensive testing)

Estimated Effort

• Implementation Time: 1.5 days
• Test Data Creation: 0.5 days for comprehensive mock response library
• Edge Case Coverage: 0.5 days for boundary and error condition testing
• Documentation: 0.5 days for test documentation and maintenance guides

Validation Approach

• Automated Execution: Tests run automatically via pytest with project's existing configuration
• Mock Verification: Ensure all network calls are properly intercepted and mocked
• Coverage Analysis: Use coverage tools to verify complete method and branch coverage
• Maintenance Testing: Verify tests remain stable with future service implementation changes

This comprehensive unit testing approach ensures the SolanaBlockchainService is thoroughly validated before integration testing, providing confidence in core functionality and error handling behavior.

[Haydart]

Closing as part of epic completion - SimpleSolanaService implementation is complete