test(irm): add ping tests

morpho-org · Nov 15, 2023 · 087536c · 087536c
1 parent 77ed9c1
commit 087536c
Showing 1 changed file with 42 additions and 0 deletions.
diff --git a/test/SpeedJumpIrmTest.sol b/test/SpeedJumpIrmTest.sol
@@ -121,6 +121,48 @@ contract AdaptativeCurveIrmTest is Test {
         assertApproxEqRel(irm.borrowRateView(marketParams, market), uint256(0.00057 ether) / 365 days, 0.1 ether);
     }
 
+    function testRateAfter60DaysNoPing() public {
+        Market memory market;
+        market.totalSupplyAssets = 10 ether;
+        market.totalBorrowAssets = 9 ether;
+        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 + 60 days);
+
+        market.totalBorrowAssets = 9.5 ether;
+        irm.borrowRate(marketParams, market);
+
+        assertApproxEqRel(irm.rateAtTarget(marketParams.id()), int256(0.6092 ether) / 365 days, 0.0001 ether);
+    }
+
+    function testRateAfter60DaysPingEveryDay() public {
+        Market memory market;
+        market.totalSupplyAssets = 10 ether;
+        market.totalBorrowAssets = 9 ether;
+        assertEq(irm.borrowRate(marketParams, market), uint256(INITIAL_RATE_AT_TARGET));
+        assertEq(irm.rateAtTarget(marketParams.id()), INITIAL_RATE_AT_TARGET);
+
+        market.totalBorrowAssets = 9.5 ether;
+
+        for (uint256 i; i < 60; ++i) {
+            market.lastUpdate = uint128(block.timestamp);
+            vm.warp(block.timestamp + 1 days);
+
+            uint256 avgBorrowRate = irm.borrowRate(marketParams, market);
+            uint256 interest = market.totalBorrowAssets.wMulDown(avgBorrowRate.wTaylorCompounded(1 days));
+            market.totalSupplyAssets += uint128(interest);
+            market.totalBorrowAssets += uint128(interest);
+
+            // Utilization starts to grow significantly (0.5%) due to each ping.
+            assertApproxEqRel(market.totalBorrowAssets.wDivDown(market.totalSupplyAssets), 0.95 ether, 0.005 ether);
+        }
+
+        // End rate at target is significantly greater than expected (5%).
+        assertApproxEqRel(irm.rateAtTarget(marketParams.id()), int256(0.6092 ether) / 365 days, 0.05 ether);
+    }
+
     function testFirstBorrowRate(Market memory market) public {
         vm.assume(market.totalBorrowAssets > 0);
         vm.assume(market.totalSupplyAssets >= market.totalBorrowAssets);