test: added check that dsf is reset on undelegation

src/test/integration/IntegrationBase.t.sol

@@ -565,6 +565,17 @@ abstract contract IntegrationBase is IntegrationDeployer, TypeImporter {
             assertEq(slashableStake[i], 0, err);
         }
     }
+
+    function assert_DSF_Reset(
+        User staker,
+        IStrategy[] memory strategies,
+        string memory err
+    ) internal {
+        uint[] memory depositScalingFactors = _getDepositScalingFactors(staker, strategies);
+        for (uint i = 0; i < strategies.length; i++) {
+            assertEq(depositScalingFactors[i], WAD, err);
+        }
+    }
 
     /*******************************************************************************
                                 SNAPSHOT ASSERTIONS
@@ -2760,6 +2771,18 @@ abstract contract IntegrationBase is IntegrationDeployer, TypeImporter {
         return shares;
     }
 
+    function _getDepositScalingFactors(User staker, IStrategy[] memory strategies) internal view returns (uint[] memory) {
+        uint[] memory depositScalingFactors = new uint[](strategies.length);
+        for (uint i=0; i < strategies.length; i++) {
+            depositScalingFactors[i] = _getDepositScalingFactor(staker, strategies[i]);
+        }
+        return depositScalingFactors;
+    }
+
+    function _getDepositScalingFactor(User staker, IStrategy strategy) internal view returns (uint) {
+        return delegationManager.depositScalingFactor(address(staker), strategy);
+    }
+
     function _getExpectedDSFUndelegate(User staker) internal view returns (uint expectedDepositScalingFactor) {
         return WAD.divWad(_getBeaconChainSlashingFactor(staker));
     }

src/test/integration/IntegrationChecks.t.sol

@@ -243,6 +243,8 @@ contract IntegrationCheckUtils is IntegrationBase {
             "check_Undelegate_State: calculated withdrawal should match returned root");
         assert_AllWithdrawalsPending(withdrawalRoots,
             "check_Undelegate_State: stakers withdrawal should now be pending");
+        assert_DSF_Reset(staker, strategies,
+            "check_Undelegate_State: staker dsfs should be reset to wad");
         assert_Snap_Added_QueuedWithdrawals(staker, withdrawals,
             "check_Undelegate_State: staker should have increased nonce by withdrawals.length");
         assert_Snap_Removed_OperatorShares(operator, strategies, stakerDelegatedShares,