# Testing Guide

## Overview

The DBIS system includes comprehensive test coverage across multiple test types:
- Unit tests
- Integration tests
- Invariant tests
- Fuzz tests
- Fork tests

## Running Tests

### All Tests
```bash
forge test
```

### Specific Test File
```bash
forge test --match-path test/vault/DBISInstitutionalVault.t.sol
```

### Verbose Output
```bash
forge test -vvv
```

### Gas Report
```bash
forge test --gas-report
```

## Test Structure

### Unit Tests
Located in `test/{contract}/`:
- `test/vault/DBISInstitutionalVault.t.sol`
- `test/router/FlashLoanRouter.t.sol`
- `test/kernel/RecursiveLeverageKernel.t.sol`

### Integration Tests
Located in `test/integration/`:
- `test/integration/FullCycle.t.sol`
- `test/integration/AmortizationInvariant.t.sol`

### Fuzz Tests
Located in `test/fuzz/`:
- `test/fuzz/KernelFuzz.t.sol`

## Test Categories

### 1. Core Functionality Tests

#### Vault Tests
```solidity
function test_RecordCollateralAdded() public {
    // Test collateral recording
}

function test_RecordDebtRepaid() public {
    // Test debt repayment recording
}

function test_VerifyPositionImproved() public {
    // Test invariant verification
}
```

#### Kernel Tests
```solidity
function test_ExecuteAmortizingCycle() public {
    // Test full amortization cycle
}

function test_ExecuteAmortizingCycleRevertsIfInvariantFails() public {
    // Test invariant enforcement
}
```

### 2. Invariant Tests

Foundry invariant tests ensure invariants hold:

```solidity
function invariant_HealthFactorNeverDecreases() public {
    // HF must never decrease
}

function invariant_DebtNeverIncreases() public {
    // Debt must never increase
}

function invariant_CollateralNeverDecreases() public {
    // Collateral must never decrease
}
```

Run invariant tests:
```bash
forge test --match-test invariant
```

### 3. Fuzz Tests

Random input testing to find edge cases:

```solidity
function testFuzz_ExecuteCycleWithRandomAmounts(
    uint256 flashAmount,
    uint256 yieldAmount
) public {
    // Fuzz with random amounts
    // Ensure invariants hold
}
```

Run fuzz tests:
```bash
forge test --match-test testFuzz
```

### 4. Fork Tests

Test against mainnet state:

```bash
forge test --fork-url $RPC_URL
```

## Test Utilities

### Helpers

Create test helpers in `test/helpers/`:

```solidity
contract TestHelpers {
    function deployMockAavePool() internal returns (address) {
        // Deploy mock
    }
    
    function createPosition(uint256 collateral, uint256 debt) internal {
        // Setup test position
    }
}
```

### Mocks

Mock external contracts:
- Mock Aave Pool
- Mock Oracle
- Mock Uniswap Router

## Test Scenarios

### Happy Path
1. Successful amortization cycle
2. Position improvement
3. Invariant preservation

### Edge Cases
1. Maximum loops reached
2. Flash loan fee exceeds profit
3. Swap slippage too high
4. Health factor at threshold

### Failure Modes
1. Policy denial
2. Invariant violation
3. Flash loan unavailable
4. Insufficient gas

### Stress Tests
1. Large positions
2. High leverage
3. Multiple concurrent cycles
4. Rapid price changes

## Coverage Goals

Target coverage:
- Core contracts: >90%
- Governance: >85%
- Utilities: >80%
- Overall: >85%

Generate coverage report:
```bash
forge coverage
```

## Continuous Integration

### GitHub Actions Example

```yaml
name: Tests
on: [push, pull_request]
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Install Foundry
        uses: foundry-rs/foundry-toolchain@v1
      - name: Run tests
        run: forge test
      - name: Generate coverage
        run: forge coverage
```

## Best Practices

1. **Test All Edge Cases**: Include boundary conditions
2. **Use Descriptive Names**: Clear test function names
3. **Test Invariants**: Always verify invariants
4. **Mock External Dependencies**: Use mocks for external calls
5. **Test Both Success and Failure**: Cover all paths
6. **Use Fuzz Testing**: Find unexpected edge cases
7. **Fork Tests for Integration**: Test with real protocols
8. **Gas Optimization Tests**: Ensure gas efficiency

## Debugging Tests

### Verbose Output
```bash
forge test -vvvv  # Maximum verbosity
```

### Debug Specific Test
```bash
forge test --match-test test_ExecuteCycle -vvv
```

### Trace Transactions
```bash
forge test --debug test_ExecuteCycle
```

## Test Data

### Fixtures
Store test data in `test/fixtures/`:
- Sample positions
- Test transaction data
- Expected outcomes

### Constants
Define test constants:
```solidity
uint256 constant TEST_COLLATERAL = 1000e18;
uint256 constant TEST_DEBT = 800e18;
address constant TEST_ASSET = 0x...
```