Fix/fuzz tests improvements (#178)

* chore: fix linter setup

* chore: update smocked files

* chore: add missing spdx identifier

* chore: add an npm script to run echidna tests

* test: ensure SpotPriceAfterBelowSpotPriceBefore is never thrown

* chore: fix natspec issues

* test: ensure fuzz_joinExitPool body is runnable

* chore: cleaning up fuzz (#179)

* feat: creating BCoWPoolForTest to avoid modifying core contracts

* fix: test:echidna script

* fix: safeTransfer issue with echidna

* chore: update test contract licenses

* test: document property 25

* chore: remove unimplemented function

---------

Co-authored-by: Weißer Hase <[email protected]>

Author: 0xteddybear

Diff for: .forge-snapshots/newBFactory.snap

@@ -1 +1 @@
-4130633
+4130621

Diff for: .gitignore

@@ -21,4 +21,5 @@ broadcast/*/*/*
 out
 
 # echidna corpuses
-**/corpuses/*
+**/corpuses/*
+**/crytic-export/*

Diff for: .solhintignore

@@ -1,3 +1,2 @@
 test/smock/*
 test/manual-smock/*
-test/invariants/*

Diff for: foundry.toml

@@ -12,7 +12,7 @@ sort_imports = true
 solc_version = '0.8.25'
 libs = ["node_modules", "lib"]
 optimizer_runs = 500
-evm_version = 'shanghai'
+evm_version = 'cancun'
 fs_permissions = [{ access = "read-write", path = ".forge-snapshots/"}]
 # 2018: function can be view, so far only caused by mocks
 # 2394: solc insists on reporting on every transient storage use

Diff for: package.json

@@ -27,6 +27,7 @@
     "prepare": "husky install",
     "smock": "smock-foundry --contracts src/contracts",
     "test": "yarn test:integration && yarn test:unit",
+    "test:echidna": "find test/invariants/fuzz -regex '.*\\.t\\.sol$' |cut -d '/' -f 4 | cut -d . -f 1 |xargs -I{} echidna test/invariants/fuzz/{}.t.sol --contract Fuzz{} --config test/invariants/fuzz/{}.yaml",
     "test:integration": "forge test --ffi --match-path 'test/integration/**' -vvv --isolate",
     "test:local": "FOUNDRY_FUZZ_RUNS=100 forge test -vvv",
     "test:scaffold": "bulloak check --fix test/unit/*.tree && forge fmt",

Diff for: src/contracts/BPool.sol

@@ -30,10 +30,6 @@ contract BPool is BToken, BMath, IBPool {
   /// @dev Sum of all token weights
   uint256 internal _totalWeight;
 
-  /// TEST TEST TEST TEST TEST TEST TEST TEST
-  bytes32 internal _reenteringMutex;
-  /// TEST TEST TEST TEST TEST TEST TEST TEST
-
   /// @dev Logs the call data
   modifier _logs_() {
     emit LOG_CALL(msg.sig, msg.sender, msg.data);
@@ -152,8 +148,8 @@ contract BPool is BToken, BMath, IBPool {
 
     _pullUnderlying(token, msg.sender, balance);
   }
-  /// @inheritdoc IBPool
 
+  /// @inheritdoc IBPool
   function unbind(address token) external _logs_ _lock_ _controller_ _notFinalized_ {
     if (!_records[token].bound) {
       revert BPool_TokenNotBound();
@@ -601,10 +597,9 @@ contract BPool is BToken, BMath, IBPool {
    * be interpreted as locked
    */
   function _setLock(bytes32 value) internal virtual {
-    // assembly ("memory-safe") {
-    //   tstore(_MUTEX_TRANSIENT_STORAGE_SLOT, value)
-    // }
-    _reenteringMutex = value;
+    assembly ("memory-safe") {
+      tstore(_MUTEX_TRANSIENT_STORAGE_SLOT, value)
+    }
   }
 
   /**
@@ -675,9 +670,8 @@ contract BPool is BToken, BMath, IBPool {
    * allowing calls
    */
   function _getLock() internal view virtual returns (bytes32 value) {
-    // assembly ("memory-safe") {
-    //   value := tload(_MUTEX_TRANSIENT_STORAGE_SLOT)
-    // }
-    value = _reenteringMutex;
+    assembly ("memory-safe") {
+      value := tload(_MUTEX_TRANSIENT_STORAGE_SLOT)
+    }
   }
 }

Diff for: test/invariants/.solhint.json

@@ -0,0 +1,13 @@
+{
+  "rules": {
+    "custom-errors": "off",
+    "no-empty-blocks":"off",
+    "reason-string": "off",
+    "reentrancy": "off",
+    "style-guide-casing": [ "warn", {
+      "ignoreVariables": true,
+      "ignorePublicFunctions": true,
+      "ignoreExternalFunctions": true
+    }]
+  }
+}

Diff for: test/invariants/PROPERTIES.md

@@ -24,6 +24,7 @@
 | only the settler can commit a hash                                                          | High level          | 22  | [x]    | [x]     |
 | when a hash has been commited, only this order can be settled                               | High level          | 23  | [ ]    | [ ]     |
 | BToken should not break the ToB ERC20 properties**                                          | High level          | 24  |        | [x]     |
+| Spot price after swap is always greater than before swap                                    | High level          | 25  |        | [x]     |
 
 > (*) Bundled with 24
 
@@ -88,4 +89,4 @@ power of a power should mult the exp (x^a)^b == x^(a*b)
 ## Untested (precision issues in test settingsq)
 calcOutGivenIn should be inv with calcInGivenOut
 calcPoolOutGivenSingleIn should be inv with calcSingleInGivenPoolOut
-calcSingleOutGivenPoolIn should be inv with calcPoolInGivenSingleOut
+calcSingleOutGivenPoolIn should be inv with calcPoolInGivenSingleOut

Diff for: test/invariants/fuzz/BNum.t.sol

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: UNLICENSED
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
 import {EchidnaTest} from '../helpers/AdvancedTestsUtils.sol';

Diff for: test/invariants/fuzz/BToken.t.sol

@@ -1,11 +1,12 @@
+// SPDX-License-Identifier: MIT
 pragma solidity 0.8.25;
 
 import {EchidnaTest} from '../helpers/AdvancedTestsUtils.sol';
 import {CryticERC20ExternalBasicProperties} from
   '@crytic/properties/contracts/ERC20/external/properties/ERC20ExternalBasicProperties.sol';
 import {ITokenMock} from '@crytic/properties/contracts/ERC20/external/util/ITokenMock.sol';
 import {PropertiesConstants} from '@crytic/properties/contracts/util/PropertiesConstants.sol';
-import 'contracts/BToken.sol';
+import {BToken} from 'contracts/BToken.sol';
 
 contract FuzzBToken is CryticERC20ExternalBasicProperties, EchidnaTest {
   constructor() {