Apply PR feedback from @djrtwo and add more tests

specs/_features/eip7002/beacon-chain.md

@@ -42,7 +42,7 @@ This mechanism relies on the changes proposed by [EIP-7002](http://eips.ethereum
 
 | Name | Value |
 | - | - |
-| `MAX_EXITS_PER_BLOCK` | `2**4` (= 16) |
+| `MAX_EXECUTION_LAYER_EXITS` | `2**4` (= 16) |
 
 ## Containers
 
@@ -80,7 +80,7 @@ class ExecutionPayload(Container):
     transactions: List[Transaction, MAX_TRANSACTIONS_PER_PAYLOAD]
     withdrawals: List[Withdrawal, MAX_WITHDRAWALS_PER_PAYLOAD]
     excess_data_gas: uint256
-    exits: List[ExecutionLayerExit, MAX_EXITS_PER_BLOCK]  # [New in EIP7002]
+    exits: List[ExecutionLayerExit, MAX_EXECUTION_LAYER_EXITS]  # [New in EIP7002]
 ```
 
 #### `ExecutionPayloadHeader`
@@ -243,11 +243,9 @@ def process_execution_layer_exit(state: BeaconState, execution_layer_exit: Execu
     validator = state.validators[validator_index]
 
     # Verify withdrawal credentials
-    is_correct_source_address = (
-        validator.withdrawal_credentials[:1] == ETH1_ADDRESS_WITHDRAWAL_PREFIX
-        and validator.withdrawal_credentials[12:] == execution_layer_exit.source_address
-    )
-    if not is_correct_source_address:
+    is_execution_address = validator.withdrawal_credentials[:1] == ETH1_ADDRESS_WITHDRAWAL_PREFIX
+    is_correct_source_address = validator.withdrawal_credentials[12:] == execution_layer_exit.source_address
+    if not (is_execution_address and is_correct_source_address):
         return
     # Verify the validator is active
     if not is_active_validator(validator, get_current_epoch(state)):

specs/_features/eip7002/fork.md

@@ -89,6 +89,7 @@ def upgrade_to_eip7002(pre: deneb.BeaconState) -> BeaconState:
         transactions_root=pre.latest_execution_payload_header.transactions_root,
         withdrawals_root=pre.latest_execution_payload_header.withdrawals_root,
         excess_data_gas=uint256(0),
+        exits_root=Root(),  # [New in EIP-7002]
     )
     post = BeaconState(
         # Versioning

tests/core/pyspec/eth2spec/test/eip7002/block_processing/test_process_execution_layer_exit.py

@@ -40,3 +40,48 @@ def test_incorrect_source_address(spec, state):
     )
 
     yield from run_execution_layer_exit_processing(spec, state, execution_layer_exit, success=False)
+
+
+@with_eip7002_and_later
+@spec_state_test
+def test_incorrect_withdrawal_credential_prefix(spec, state):
+    # move state forward SHARD_COMMITTEE_PERIOD epochs to allow for exit
+    state.slot += spec.config.SHARD_COMMITTEE_PERIOD * spec.SLOTS_PER_EPOCH
+
+    current_epoch = spec.get_current_epoch(state)
+    validator_index = spec.get_active_validator_indices(state, current_epoch)[0]
+    validator_pubkey = state.validators[validator_index].pubkey
+    address = b'\x22' * 20
+    set_eth1_withdrawal_credential_with_balance(spec, state, validator_index, address=address)
+    # Set incorrect prefix
+    state.validators[validator_index].withdrawal_credentials = (
+        spec.BLS_WITHDRAWAL_PREFIX
+        + state.validators[validator_index].withdrawal_credentials[1:]
+    )
+    execution_layer_exit = spec.ExecutionLayerExit(
+        source_address=address,
+        validator_pubkey=validator_pubkey,
+    )
+
+    yield from run_execution_layer_exit_processing(spec, state, execution_layer_exit, success=False)
+
+
+@with_eip7002_and_later
+@spec_state_test
+def test_on_exit_initiated_validator(spec, state):
+    # move state forward SHARD_COMMITTEE_PERIOD epochs to allow for exit
+    state.slot += spec.config.SHARD_COMMITTEE_PERIOD * spec.SLOTS_PER_EPOCH
+
+    current_epoch = spec.get_current_epoch(state)
+    validator_index = spec.get_active_validator_indices(state, current_epoch)[0]
+    validator_pubkey = state.validators[validator_index].pubkey
+    address = b'\x22' * 20
+    set_eth1_withdrawal_credential_with_balance(spec, state, validator_index, address=address)
+    # Initiate exit earlier
+    spec.initiate_validator_exit(state, validator_index)
+    execution_layer_exit = spec.ExecutionLayerExit(
+        source_address=address,
+        validator_pubkey=validator_pubkey,
+    )
+
+    yield from run_execution_layer_exit_processing(spec, state, execution_layer_exit, success=False)

tests/core/pyspec/eth2spec/test/helpers/execution_layer_exits.py

@@ -14,6 +14,7 @@ def run_execution_layer_exit_processing(spec, state, execution_layer_exit, valid
       - execution_layer_exit ('execution_layer_exit')
       - post-state ('post').
     If ``valid == False``, run expecting ``AssertionError``
+    If ``success == False``, it doesn't initiate exit successfully
     """
     validator_index = get_validator_index_by_pubkey(state, execution_layer_exit.validator_pubkey)
 

tests/core/pyspec/eth2spec/test/helpers/fork_transition.py

@@ -162,6 +162,8 @@ def do_fork(state, spec, post_spec, fork_epoch, with_block=True, sync_aggregate=
         state = post_spec.upgrade_to_deneb(state)
     elif post_spec.fork == EIP6110:
         state = post_spec.upgrade_to_eip6110(state)
+    elif post_spec.fork == EIP7002:
+        state = post_spec.upgrade_to_eip7002(state)
 
     assert state.fork.epoch == fork_epoch