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test(irm): add ping tests #80

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merged 7 commits into from
Nov 16, 2023
Merged

test(irm): add ping tests #80

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087536c
test(irm): add ping tests
Rubilmax Nov 15, 2023
30496ec
Merge branch 'refactor/curve' of github.com:morpho-labs/morpho-blue-p…
Rubilmax Nov 15, 2023
339d06d
test(irm): add failing test case
Rubilmax Nov 15, 2023
3fbeaf1
test(irm): improve tests
Rubilmax Nov 16, 2023
0fedf48
fix: apply suggestions
Rubilmax Nov 16, 2023
421b86a
Merge branch 'feat/riemann-avg' of github.com:morpho-labs/morpho-blue…
Rubilmax Nov 16, 2023
08f10de
test(irm): add tests
Rubilmax Nov 16, 2023
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86 changes: 85 additions & 1 deletion test/SpeedJumpIrmTest.sol
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,7 @@ contract AdaptativeCurveIrmTest is Test {

function testFirstBorrowRateUtilizationTarget() public {
Market memory market;
market.totalBorrowAssets = 0.9 ether;
market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
market.totalSupplyAssets = 1 ether;

assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET), "avgBorrowRate");
Expand Down Expand Up @@ -121,6 +121,90 @@ contract AdaptativeCurveIrmTest is Test {
assertApproxEqRel(irm.borrowRateView(marketParams, market), uint256(0.00057 ether) / 365 days, 0.1 ether);
}

function testRateAfter60DaysUtilizationAboveTargetNoPing() public {
Market memory market;
market.totalSupplyAssets = 1 ether;
market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET));
assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);
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market.lastUpdate = uint128(block.timestamp);
vm.warp(block.timestamp + 60 days);

market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION + 1 ether) / 2);
irm.borrowRate(marketParams, market);

assertApproxEqRel(irm.rateAtTarget(marketParams.id()), int256(0.6092 ether) / 365 days, 0.0001 ether);
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}

function testRateAfter60DaysUtilizationAboveTargetPingEveryHour() public {
Market memory market;
market.totalSupplyAssets = 1 ether;
market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET));
assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);

market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION + 1 ether) / 2); // Error = 50%

for (uint256 i; i < 60 days / 1 hours; ++i) {
market.lastUpdate = uint128(block.timestamp);
vm.warp(block.timestamp + 1 hours);

uint256 avgBorrowRate = irm.borrowRate(marketParams, market);
uint256 interest = market.totalBorrowAssets.wMulDown(avgBorrowRate.wTaylorCompounded(1 hours));
market.totalSupplyAssets += uint128(interest);
market.totalBorrowAssets += uint128(interest);
}

assertApproxEqRel(market.totalBorrowAssets.wDivDown(market.totalSupplyAssets), 0.95 ether, 0.005 ether);
assertApproxEqRel(irm.rateAtTarget(marketParams.id()), int256(0.6092 ether) / 365 days, 0.06 ether);
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}

function testRateAfterUtilizationTargetNoPing(uint256 elapsed) public {
elapsed = bound(elapsed, 0, type(uint48).max);

Market memory market;
market.totalSupplyAssets = 1 ether;
market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET));
assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);

market.lastUpdate = uint128(block.timestamp);
vm.warp(block.timestamp + elapsed);

irm.borrowRate(marketParams, market);

assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);
}

function testRateAfter3WeeksUtilizationTargetPingEveryMinute() public {
int256 initialRateAtTarget = int256(1 ether) / 365 days; // 100%

irm =
new AdaptativeCurveIrm(address(this), CURVE_STEEPNESS, ADJUSTMENT_SPEED, TARGET_UTILIZATION, initialRateAtTarget);

Market memory market;
market.totalSupplyAssets = 1 ether;
market.totalBorrowAssets = uint128(uint256(TARGET_UTILIZATION));
assertEq(irm.borrowRate(marketParams, market), uint256(initialRateAtTarget));
assertEq(irm.rateAtTarget(marketParams.id()), initialRateAtTarget);

for (uint256 i; i < 3 weeks / 1 minutes; ++i) {
market.lastUpdate = uint128(block.timestamp);
vm.warp(block.timestamp + 1 minutes);

uint256 avgBorrowRate = irm.borrowRate(marketParams, market);
uint256 interest = market.totalBorrowAssets.wMulDown(avgBorrowRate.wTaylorCompounded(1 minutes));
market.totalSupplyAssets += uint128(interest);
market.totalBorrowAssets += uint128(interest);
}

assertApproxEqRel(
market.totalBorrowAssets.wDivDown(market.totalSupplyAssets), uint256(TARGET_UTILIZATION), 0.01 ether
);
assertApproxEqRel(irm.rateAtTarget(marketParams.id()), initialRateAtTarget, 0.1 ether);
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}

function testFirstBorrowRate(Market memory market) public {
vm.assume(market.totalBorrowAssets > 0);
vm.assume(market.totalSupplyAssets >= market.totalBorrowAssets);
Expand Down