Refactor/375 test patterns standardization

[Oluwasuyi-Timilehin]

#closes #375

Summary

This PR implements consistent test patterns across the TeachLink contract test suite, addressing issue #375.

Tasks Completed

Task 1: Standardize Test Structure

Files Modified:

• contracts/teachlink/tests/common/mod.rs (new)
• contracts/teachlink/tests/test_assessment.rs
• contracts/teachlink/tests/test_interface_versioning.rs
• contracts/teachlink/tests/test_security.rs
• contracts/teachlink/tests/test_rewards.rs

Changes:

• Created shared test helper module with common fixtures
• Standardized environment setup with test_env() helper
• Unified contract registration with register_bridge_client()
• Consistent address generation with random_address()
• Centralized binary data creation with bytes() helper
• Replaced duplicate setup code with reusable setup_bridge_test()

Impact: Eliminates code duplication and ensures consistent test initialization across modules.

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Task 2: Use Common Fixtures

Files Modified: All test files listed above

Changes:

• Replaced individual Env::default() and env.mock_all_auths() calls with shared test_env()
• Standardized SAC token registration with register_sac_token()
• Unified bridge client setup patterns

Impact: Reduces boilerplate and improves maintainability of test code.

---

Task 3: Apply Naming Conventions

Files Modified: All test files and new common module

Changes:

• Consistent function naming: test_env(), register_bridge_client(), random_address(), bytes()
• Standardized test setup function names across modules
• Clear, descriptive helper function names

Impact: Improves code readability and follows Rust naming conventions.

---

Task 4: Document Test Patterns

Files Modified: TESTING_PLATFORM.md

Changes:

• Added documentation for shared TeachLink test helpers
• Updated test data management section
• Included usage examples for common fixtures

Impact: Provides guidance for future test development and maintains consistency.

---

Testing

All modified test files pass compilation and maintain existing functionality:

• Assessment tests: 5 test functions
• Interface versioning tests: 3 test functions
• Security tests: 3 test functions
• Rewards tests: 7 test functions

Run tests with:

cargo test -p teachlink-contract --test test_assessment --test test_interface_versioning --test test_security --test test_rewards

Acceptance Criteria Met

Task 1: Standardize test structure

• Consistent environment setup
• Unified contract registration
• Shared helper functions

Task 2: Use common fixtures

• Replaced duplicate setup code
• Centralized test data generation
• Reusable test fixtures

Task 3: Apply naming conventions

• Consistent function naming
• Descriptive helper names
• Rust naming standards

Task 4: Document test patterns

• Updated TESTING_PLATFORM.md
• Added usage examples
• Provided guidance for future tests

#closes

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