Initial commit

test/integration/AmortizationInvariant.t.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import "forge-std/Test.sol";
+import "../../contracts/core/RecursiveLeverageKernel.sol";
+import "../../contracts/core/DBISInstitutionalVault.sol";
+import "../../contracts/core/FlashLoanRouter.sol";
+import "../../contracts/interfaces/IVault.sol";
+import "../../contracts/interfaces/IKernel.sol";
+
+/**
+ * @title AmortizationInvariantTest
+ * @notice Invariant tests ensuring position never worsens
+ */
+contract AmortizationInvariantTest is Test {
+    // Contracts would be initialized in setUp()
+    // This is a template for invariant testing
+
+    function test_AmortizationMustImprovePosition() public {
+        // 1. Take initial snapshot
+        // 2. Execute amortization cycle
+        // 3. Verify:
+        //    - Debt decreased OR
+        //    - Collateral increased OR
+        //    - Health factor improved
+        // 4. Assert all three improved
+    }
+
+    function test_AmortizationRevertsIfHFWorsens() public {
+        // Test that if HF would worsen, transaction reverts
+    }
+
+    function test_AmortizationRevertsIfDebtIncreases() public {
+        // Test that if debt increases, transaction reverts
+    }
+
+    function test_AmortizationRevertsIfCollateralDecreases() public {
+        // Test that if collateral decreases, transaction reverts
+    }
+
+    function invariant_HealthFactorNeverDecreases() public {
+        // Foundry invariant test
+        // Ensures HF never decreases after any operation
+    }
+
+    function invariant_DebtNeverIncreases() public {
+        // Foundry invariant test
+        // Ensures debt never increases after amortization
+    }
+
+    function invariant_CollateralNeverDecreases() public {
+        // Foundry invariant test
+        // Ensures collateral never decreases after amortization
+    }
+}
+