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test(common): add proptest suite for risk::collateral_value and ltv_bps monotonicity (#87) - #1141
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Closes #87
Summary
proptest(default-features = false, features = ["alloc"]) to[dev-dependencies]incontracts/common/Cargo.toml.proptest!suite incontracts/common/src/risk.rsverifying:collateral_valuemonotonicity inunitsandprice, non-Increasing behavior inhaircut.base_bpsandhaircut.fx_bps, zero output when total haircut is>= 10_000, and exact match withpricewhenunits == PRICE_SCALEand haircuts are0.ltv_bpsmonotonicity indebt, non-Increasing behavior incollateral_val,u32::MAXsentinel whencollateral_val <= 0 && debt > 0, and0whendebt <= 0.