integrative unit test

src/test/TestUSDCIntegration.t.sol

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+pragma solidity ^0.8.18;
+
+import "forge-std/console2.sol";
+import {ERC20Mock} from "@openzeppelin/contracts/mocks/ERC20Mock.sol";
+import {MockTermRepoToken} from "./mocks/MockTermRepoToken.sol";
+import {MockTermAuction} from "./mocks/MockTermAuction.sol";
+import {MockUSDC} from "./mocks/MockUSDC.sol";
+import {Setup, ERC20, IStrategyInterface} from "./utils/Setup.sol";
+import {Strategy} from "../Strategy.sol";
+
+contract TestUSDCIntegration is Setup {
+    uint256 internal constant TEST_REPO_TOKEN_RATE = 0.05e18;
+    uint256 public constant THREESIXTY_DAYCOUNT_SECONDS = 360 days;
+    uint256 public constant RATE_PRECISION = 1e18;
+
+    MockUSDC internal mockUSDC;
+    ERC20Mock internal mockCollateral; 
+    MockTermRepoToken internal repoToken1Week;
+    MockTermRepoToken internal repoToken1Month;
+    MockTermAuction internal repoToken1WeekAuction;
+    Strategy internal termStrategy;
+    StrategySnapshot internal initialState;
+
+    function setUp() public override {
+        mockUSDC = new MockUSDC();
+        mockCollateral = new ERC20Mock();
+
+        _setUp(ERC20(address(mockUSDC)));
+
+        repoToken1Week = new MockTermRepoToken(
+            bytes32("test repo token 1"), address(mockUSDC), address(mockCollateral), 1e18, 1 weeks
+        );        
+        repoToken1Month = new MockTermRepoToken(
+            bytes32("test repo token 2"), address(mockUSDC), address(mockCollateral), 1e18, 4 weeks
+        );    
+        termController.setOracleRate(MockTermRepoToken(repoToken1Week).termRepoId(), TEST_REPO_TOKEN_RATE);
+        termController.setOracleRate(MockTermRepoToken(repoToken1Month).termRepoId(), TEST_REPO_TOKEN_RATE);
+
+
+        termStrategy = Strategy(address(strategy));
+
+        repoToken1WeekAuction = new MockTermAuction(repoToken1Week);
+
+        vm.startPrank(management);
+        termStrategy.setCollateralTokenParams(address(mockCollateral), 0.5e18);
+        termStrategy.setTimeToMaturityThreshold(3 weeks);
+        termStrategy.setRepoTokenConcentrationLimit(1e18);
+        termStrategy.setRequiredReserveRatio(0);
+        termStrategy.setdiscountRateMarkup(0);
+        vm.stopPrank();
+
+        // start with some initial funds
+        mockUSDC.mint(address(strategy), 100e6);
+
+        initialState.totalAssetValue = termStrategy.totalAssetValue();
+        initialState.totalLiquidBalance = termStrategy.totalLiquidBalance();
+    }
+
+    function _submitOffer(bytes32 idHash, uint256 offerAmount) private returns (bytes32) { 
+        // test: only management can submit offers
+        vm.expectRevert("!management");
+        bytes32[] memory offerIds = termStrategy.submitAuctionOffer(
+            repoToken1WeekAuction, address(repoToken1Week), idHash, bytes32("test price"), offerAmount
+        );        
+
+        vm.prank(management);
+        offerIds = termStrategy.submitAuctionOffer(
+            repoToken1WeekAuction, address(repoToken1Week), idHash, bytes32("test price"), offerAmount
+        );        
+
+        assertEq(offerIds.length, 1);
+
+        return offerIds[0];
+    }
+
+    function testSellRepoTokenSubmitOfferAndCloseAuction() public {       
+        address testUser = vm.addr(0x11111);  
+        mockUSDC.mint(testUser, 1e18);
+        repoToken1Month.mint(testUser, 1000e18);
+
+        vm.startPrank(testUser);
+        mockUSDC.approve(address(mockYearnVault), type(uint256).max);
+        mockYearnVault.deposit(1e18, testUser);
+        repoToken1Month.approve(address(strategy), type(uint256).max);
+        termStrategy.sellRepoToken(address(repoToken1Month), 1e6);
+        mockYearnVault.withdraw(1e18, testUser, testUser);
+        vm.stopPrank();
+
+        address[] memory holdings = termStrategy.repoTokenHoldings();
+
+        assertEq(holdings.length, 1);
+
+
+        bytes32 offerId1 = _submitOffer(bytes32("offer id hash 1"), 1e6);
+        bytes32[] memory offerIds = new bytes32[](1);
+        offerIds[0] = offerId1;
+        uint256[] memory fillAmounts = new uint256[](1);
+        fillAmounts[0] = 1e6;
+        uint256[] memory repoTokenAmounts = new uint256[](1);
+        repoTokenAmounts[0] = _getRepoTokenAmountGivenPurchaseTokenAmount(
+            1e6, repoToken1Week, TEST_REPO_TOKEN_RATE
+        );
+
+
+        repoToken1WeekAuction.auctionSuccess(offerIds, fillAmounts, repoTokenAmounts);
+
+        holdings = termStrategy.repoTokenHoldings();
+
+        // test: 1 holding because auctionClosed not yet called
+        assertEq(holdings.length, 1);
+
+        termStrategy.auctionClosed();
+        holdings = termStrategy.repoTokenHoldings();
+        assertEq(holdings.length, 2);
+        bytes32[] memory offers = termStrategy.pendingOffers();        
+
+        assertEq(offers.length, 0);
+
+        // assertEq(termStrategy.totalLiquidBalance(), initialState.totalLiquidBalance - 1e6);
+        // test: totalAssetValue = total liquid balance + pending offer amount
+        // assertEq(termStrategy.totalAssetValue(), termStrategy.totalLiquidBalance() + 1e6);
+    }
+
+    function _getRepoTokenAmountGivenPurchaseTokenAmount(
+        uint256 purchaseTokenAmount,
+        MockTermRepoToken termRepoToken,
+        uint256 discountRate
+    ) private view returns (uint256) {
+        (uint256 redemptionTimestamp, address purchaseToken, ,) = termRepoToken.config();
+
+        uint256 purchaseTokenPrecision = 10**ERC20(purchaseToken).decimals();
+        uint256 repoTokenPrecision = 10**ERC20(address(termRepoToken)).decimals();
+
+        uint256 timeLeftToMaturityDayFraction = 
+            ((redemptionTimestamp - block.timestamp) * purchaseTokenPrecision) / THREESIXTY_DAYCOUNT_SECONDS;
+
+        // purchaseTokenAmount * (1 + r * days / 360) = repoTokenAmountInBaseAssetPrecision
+        uint256 repoTokenAmountInBaseAssetPrecision = 
+            purchaseTokenAmount * (purchaseTokenPrecision + (discountRate * timeLeftToMaturityDayFraction / RATE_PRECISION)) / purchaseTokenPrecision;
+
+        return repoTokenAmountInBaseAssetPrecision * repoTokenPrecision / purchaseTokenPrecision;
+    }
+
+}