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test: Monotonic supply share price when reporting deficit #1057

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test: Monotonic supply share price when reporting deficit #1057

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56 changes: 53 additions & 3 deletions tests/unit/Hub/Hub.ReportDeficit.t.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,6 @@ contract HubReportDeficitTest is HubBase {
super.setUp();

// deploy borrowable liquidity
_addLiquidity(daiAssetId, MAX_SUPPLY_AMOUNT);
_addLiquidity(wethAssetId, MAX_SUPPLY_AMOUNT);
_addLiquidity(usdxAssetId, MAX_SUPPLY_AMOUNT);
}

Expand Down Expand Up @@ -112,7 +110,7 @@ contract HubReportDeficitTest is HubBase {
);

uint256 drawnDeficit = vm.randomUint(0, drawn);
uint256 premiumDeficitRay = vm.randomUint(spokePremiumRay + 1, UINT256_MAX);
uint256 premiumDeficitRay = vm.randomUint(spokePremiumRay + 1, uint256(type(int256).max));

vm.expectRevert(
abi.encodeWithSelector(IHub.SurplusPremiumRayDeficitReported.selector, spokePremiumRay)
Expand Down Expand Up @@ -250,4 +248,56 @@ contract HubReportDeficitTest is HubBase {
_assertBorrowRateSynced(hub1, usdxAssetId, 'reportDeficit');
}
}

function test_reportDeficit_monotonicSupplySharePrice() public {
// mock asset interest rate to 50%
_mockInterestRateBps(50_00);

// Add liquidity, draw liquidity, refresh premium and skip time to accrue both drawn and premium debt
// This will also update the asset drawn rate to 50% (mocked above)
uint256 amount = 7;
Utils.add(hub1, wethAssetId, address(spoke1), amount, alice);
Utils.draw(hub1, wethAssetId, address(spoke1), alice, amount);
vm.startPrank(address(spoke1));
hub1.refreshPremium(
wethAssetId,
_getExpectedPremiumDelta({
hub: hub1,
assetId: wethAssetId,
oldPremiumShares: 0,
oldPremiumOffsetRay: 0,
drawnShares: 1, // risk premium is 100%
riskPremium: 100_00,
restoredPremiumRay: 0
})
);
vm.stopPrank();
skip(365 days);

// get total added assets before deficit
uint256 totalAddedAssetsBefore = hub1.getAddedAssets(wethAssetId);

// report deficit of 2 drawnAmount, and 0.5 premiumAmountRay
vm.prank(address(spoke1));
hub1.reportDeficit(
wethAssetId,
2,
IHubBase.PremiumDelta({
sharesDelta: 0,
offsetRayDelta: 0.5e27.toInt256(),
restoredPremiumRay: 0.5e27
})
);

// get total added assets after deficit
uint256 totalAddedAssetsAfter = hub1.getAddedAssets(wethAssetId);

// make sure total added assets never decreases
// during a report deficit, total added shares stay constant, hence checking total added assets only is sufficient
assertGe(
totalAddedAssetsAfter,
totalAddedAssetsBefore,
'total added assets should never decrease'
);
}
}
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