Checking for Custom Error

[KMean]

Probably a noob question but I'm trying to understand and learn.
Following Cyfrin's course on Foundry I'm left with only one branch to test in Raffle.sol

Uncovered for src/Raffle.sol:
- Branch (branch: 3, path: 0) (location: source ID 44, line 124, chars 5107-5163, hits: 0)
- Line (location: source ID 44, line 125, chars 5121-5152, hits: 0)
- Statement (location: source ID 44, line 125, chars 5121-5152, hits: 0)

which leads me to this conditional:

(bool success,) = recentWinner.call{value: address(this).balance}("");
if (!success) {
    revert Raffle__TransferFailed();
}

Is there a way to check if Raffle__TransferFailed is indeed the error triggered?

this is what I tried so far

contract RevertOnReceive {
    receive() external payable {
        revert("Forced failure");
    }
}

function testFulfillRandomWordsTransferFailureBranch() public skipFork {
        // Arrange
        RevertOnReceive player = new RevertOnReceive();
        hoax(address(player), 1 ether);
        raffle.enterRaffle{value: 1 ether}();

        vm.warp(block.timestamp + interval + 1);
        vm.roll(block.number + 1);

        // Perform upkeep to emit a requestId
        vm.recordLogs();
        raffle.performUpkeep("");
        Vm.Log[] memory entries = vm.getRecordedLogs();
        bytes32 requestId = entries[1].topics[1];

        vm.expectRevert(Raffle__TransferFailed.selector);
        // Act
        VRFCoordinatorV2_5Mock(vrfCoordinator).fulfillRandomWords(uint256(requestId), address(raffle));
        // Assert: The player's balance should remain unchanged
        assertEq(address(player).balance, 0 ether);
    }

this fails:

[352418] RaffleTest::testFulfillRandomWordsTransferFailureBranch()
    ├─ [25675] → new RevertOnReceive@0x2e234DAe75C793f67A35089C9d99245E1C58470b
    │   └─ ← [Return] 128 bytes of code
    ├─ [0] VM::deal(RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b], 1000000000000000000 [1e18])
    │   └─ ← [Return] 
    ├─ [0] VM::prank(RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   └─ ← [Return] 
    ├─ [47827] Raffle::enterRaffle{value: 1000000000000000000}()
    │   ├─ emit RaffleEntered(player: RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   └─ ← [Stop] 
    ├─ [0] VM::warp(32)
    │   └─ ← [Return] 
    ├─ [0] VM::roll(2)
    │   └─ ← [Return] 
    ├─ [0] VM::recordLogs()
    │   └─ ← [Return] 
    ├─ [146059] Raffle::performUpkeep(0x)
    │   ├─ [115645] VRFCoordinatorV2_5Mock::requestRandomWords(RandomWordsRequest({ keyHash: 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], requestConfirmations: 3, callbackGasLimit: 500000 [5e5], numWords: 1, extraArgs: 0x92fd13380000000000000000000000000000000000000000000000000000000000000000 }))
    │   │   ├─ emit RandomWordsRequested(keyHash: 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, requestId: 1, preSeed: 100, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], minimumRequestConfirmations: 3, callbackGasLimit: 500000 [5e5], numWords: 1, extraArgs: 0x92fd13380000000000000000000000000000000000000000000000000000000000000000, sender: Raffle: [0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76])
    │   │   └─ ← [Return] 1
    │   ├─ emit RequestedRaffleWinner(requestId: 1)
    │   └─ ← [Stop] 
    ├─ [0] VM::getRecordedLogs()
    │   └─ ← [Return] [([0xeb0e3652e0f44f417695e6e90f2f42c99b65cd7169074c5a654b16b9748c3a4e, 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, 0x10bcf2be64c261e434a6014656bea8260621c8940cfe977cd11416455f3a1a3c, 0x000000000000000000000000db8cff278adccf9e9b5da745b44e754fc4ee3c76], 0x000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000640000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000007a120000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000002492fd1338000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 0x34A1D3fff3958843C43aD80F30b94c510645C316), ([0xcd6e45c8998311cab7e9d4385596cac867e20a0587194b954fa3a731c93ce78b, 0x0000000000000000000000000000000000000000000000000000000000000001], 0x, 0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76)]
    ├─ [0] VM::expectRevert(custom error 0xf4844814)
    │   └─ ← [Return] 
    ├─ [73764] VRFCoordinatorV2_5Mock::fulfillRandomWords(1, Raffle: [0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76])
    │   ├─ [16561] Raffle::rawFulfillRandomWords(1, [78541660797044910968829902406342334108369226379826116161446442989268089806461 [7.854e76]])
    │   │   ├─ emit WinnerPicked(winner: RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   │   ├─ [144] RevertOnReceive::receive{value: 1000000000000000000}()
    │   │   │   └─ ← [Revert] revert: Forced failure
    │   │   ├─ [0] console::log("Transfer failed", false) [staticcall]
    │   │   │   └─ ← [Stop] 
    │   │   └─ ← [Revert] Raffle__TransferFailed()
    │   ├─ emit RandomWordsFulfilled(requestId: 1, outputSeed: 1, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], payment: 62510145000000000000 [6.251e19], nativePayment: false, success: false, onlyPremium: false)
    │   └─ ← [Stop] 
    └─ ← [Revert] next call did not revert as expected

Suite result: FAILED. 0 passed; 1 failed; 0 skipped; finished in 2.32ms (187.60µs CPU time)

Ran 1 test suite in 912.37ms (2.32ms CPU time): 0 tests passed, 1 failed, 0 skipped (1 total tests)

Failing tests:
Encountered 1 failing test in test/unit/RaffleTest.t.sol:RaffleTest
[FAIL: next call did not revert as expected] testFulfillRandomWordsTransferFailureBranch() (gas: 352418)

If I don't expectRevert it obviously pass and shows that indeed the error reverts and that the player balance did not change.

contract RevertOnReceive {
    receive() external payable {
        revert("Forced failure");
    }
}

function testFulfillRandomWordsTransferFailureBranch() public skipFork {
        // Arrange
        RevertOnReceive player = new RevertOnReceive();
        hoax(address(player), 1 ether);
        raffle.enterRaffle{value: 1 ether}();

        vm.warp(block.timestamp + interval + 1);
        vm.roll(block.number + 1);

        // Perform upkeep to emit a requestId
        vm.recordLogs();
        raffle.performUpkeep("");
        Vm.Log[] memory entries = vm.getRecordedLogs();
        bytes32 requestId = entries[1].topics[1];

        // Act
        VRFCoordinatorV2_5Mock(vrfCoordinator).fulfillRandomWords(uint256(requestId), address(raffle));
        // Assert: The player's balance should remain unchanged
        assertEq(address(player).balance, 0 ether);
    }

[352585] RaffleTest::testFulfillRandomWordsTransferFailureBranch()
    ├─ [25675] → new RevertOnReceive@0x2e234DAe75C793f67A35089C9d99245E1C58470b
    │   └─ ← [Return] 128 bytes of code
    ├─ [0] VM::deal(RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b], 1000000000000000000 [1e18])
    │   └─ ← [Return] 
    ├─ [0] VM::prank(RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   └─ ← [Return] 
    ├─ [47827] Raffle::enterRaffle{value: 1000000000000000000}()
    │   ├─ emit RaffleEntered(player: RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   └─ ← [Stop] 
    ├─ [0] VM::warp(32)
    │   └─ ← [Return] 
    ├─ [0] VM::roll(2)
    │   └─ ← [Return] 
    ├─ [0] VM::recordLogs()
    │   └─ ← [Return] 
    ├─ [146059] Raffle::performUpkeep(0x)
    │   ├─ [115645] VRFCoordinatorV2_5Mock::requestRandomWords(RandomWordsRequest({ keyHash: 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], requestConfirmations: 3, callbackGasLimit: 500000 [5e5], numWords: 1, extraArgs: 0x92fd13380000000000000000000000000000000000000000000000000000000000000000 }))
    │   │   ├─ emit RandomWordsRequested(keyHash: 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, requestId: 1, preSeed: 100, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], minimumRequestConfirmations: 3, callbackGasLimit: 500000 [5e5], numWords: 1, extraArgs: 0x92fd13380000000000000000000000000000000000000000000000000000000000000000, sender: Raffle: [0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76])
    │   │   └─ ← [Return] 1
    │   ├─ emit RequestedRaffleWinner(requestId: 1)
    │   └─ ← [Stop] 
    ├─ [0] VM::getRecordedLogs()
    │   └─ ← [Return] [([0xeb0e3652e0f44f417695e6e90f2f42c99b65cd7169074c5a654b16b9748c3a4e, 0x787d74caea10b2b357790d5b5247c2f63d1d91572a9846f780606e4d953677ae, 0x10bcf2be64c261e434a6014656bea8260621c8940cfe977cd11416455f3a1a3c, 0x000000000000000000000000db8cff278adccf9e9b5da745b44e754fc4ee3c76], 0x000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000640000000000000000000000000000000000000000000000000000000000000003000000000000000000000000000000000000000000000000000000000007a120000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000c0000000000000000000000000000000000000000000000000000000000000002492fd1338000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000, 0x34A1D3fff3958843C43aD80F30b94c510645C316), ([0xcd6e45c8998311cab7e9d4385596cac867e20a0587194b954fa3a731c93ce78b, 0x0000000000000000000000000000000000000000000000000000000000000001], 0x, 0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76)]
    ├─ [73764] VRFCoordinatorV2_5Mock::fulfillRandomWords(1, Raffle: [0xDB8cFf278adCCF9E9b5da745B44E754fC4EE3C76])
    │   ├─ [16561] Raffle::rawFulfillRandomWords(1, [78541660797044910968829902406342334108369226379826116161446442989268089806461 [7.854e76]])
    │   │   ├─ emit WinnerPicked(winner: RevertOnReceive: [0x2e234DAe75C793f67A35089C9d99245E1C58470b])
    │   │   ├─ [144] RevertOnReceive::receive{value: 1000000000000000000}()
    │   │   │   └─ ← [Revert] revert: Forced failure
    │   │   ├─ [0] console::log("Transfer failed", false) [staticcall]
    │   │   │   └─ ← [Stop] 
    │   │   └─ ← [Revert] Raffle__TransferFailed()
    │   ├─ emit RandomWordsFulfilled(requestId: 1, outputSeed: 1, subId: 7570848181127581986339189052072122886913734678723205985508750752041200654908 [7.57e75], payment: 62510145000000000000 [6.251e19], nativePayment: false, success: false, onlyPremium: false)
    │   └─ ← [Stop] 
    ├─ [0] VM::assertEq(0, 0) [staticcall]
    │   └─ ← [Return] 
    └─ ← [Stop] 

Suite result: ok. 1 passed; 0 failed; 0 skipped; finished in 7.35ms (513.57µs CPU time)

To me it looks strange that after the Raffle__TransferFailed() reverts, RandomWordsFullfilled gets emitted. Is this happening because
fullfillRandomWords is actually called by the VRFCoordinator so when reverting the execution is given back to it hence not reverting as expected? Is there a way to test that branch?