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* test: reduce test_trading.py duplication with parametrize Collapse repetitive individual tests in test_trading.py into parametrized equivalents, cutting 267 lines without losing any cases. - TestExtractTickPrice: 13 tests → 2 parametrized (×3 valid, ×10 None) - TestEstimateOrderMargin: 4 invalid-margin tests → 1 parametrized ×4; nan/inf volume tests → 1 parametrized ×2 - TestNormalizeOrderVolume: multi-assert bodies split into parametrized cases for non-finite volume and constraints - TestVolumeAndExecution: 9 place_market_order retcode tests → 1 ×11; 5 update_sltp retcode tests → 1 ×5 - test_calculate_trailing_stop_updates_missing_symbol_digits: inline double-assert body → 1 parametrized ×2 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test: further reduce test_trading.py duplication with parametrize Merge six broker stop-level tests into two parametrized tests, collapse two default-digits fallback tests and three symbol-filter zero-margin tests into one each. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test: address claude[bot] review on PR #64 - Consolidate _MISSING_RETCODE sentinel to one line with corrected comment - Add comment explaining ids list is required for deterministic node IDs - Document intentional narrower retcode coverage in update_sltp test Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * test: reduce duplication in test_sdk, test_history, test_contracts - TestBuildConfigWholeDollarEnv: 3 field tests (server/password/path) → 1 parametrized ×3 - TestResolveAccountSpec: whole-dollar expand/no-expand pair → 1 parametrized ×2 - test_normalize_mt5_exception_maps_types: 2 isinstance asserts → parametrized ×2 - test_resolve_history_tick_flags_invalid: 2 pytest.raises blocks → parametrized ×2 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: agent <agent@localhost> Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>