tests: replace aioresponses with custom aiohttp mock, consolidate tests

[firstof9]

Summary

Replaces the aioresponses third-party dependency with a custom AiohttpClientMocker class that patches aiohttp.ClientSession._request directly. Also consolidates several groups of redundant tests into parameterized equivalents.

Changes

requirements_test.txt

• Removed aioresponses dependency

tests/conftest.py

• Added MockResponse — a lightweight async context manager for mocked HTTP responses
• Added AiohttpClientMocker — patches aiohttp.ClientSession._request to intercept requests, supporting:
  • Regex or exact URL matching (with full query string resolution via yarl)
  • repeat=True for indefinitely reusable mocks
  • exception=... for simulating network errors
• Removed 5 redundant fixtures that are no longer needed:
  • test_lookup_tier_med, test_lookup_tier_high
  • test_lookup_monthly_tier_low, test_lookup_monthly_tier_med, test_lookup_monthly_tier_high

tests/test_init.py

• Consolidated 6 individual tier rate tests → test_get_tier_rate_data (@pytest.mark.parametrize)
• Consolidated 3 monthly tier rate tests → test_get_monthly_tier_rate_data (@pytest.mark.parametrize)
• Consolidated 3 sell rate tests → test_get_sell_rate_data (@pytest.mark.parametrize)

Test Results

55 tests passing, ruff lint/format clean, mypy clean.

Summary by CodeRabbit

• Tests
  • Refactored test infrastructure and fixtures to reduce code duplication.
  • Updated test mocking approach for improved maintainability.

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