test: by signature tests

src/interfaces/ILlamaCore.sol

@@ -6,6 +6,7 @@ pragma solidity ^0.8.23;
 
 import {ILlamaPolicy} from "src/interfaces/ILlamaPolicy.sol";
 import {ILlamaStrategy} from "src/interfaces/ILlamaStrategy.sol";
+import {ActionState} from "src/lib/Enums.sol";
 import {
   Action,
   ActionInfo,
@@ -20,8 +21,14 @@ import {
 /// @author Llama ([email protected])
 /// @notice This is the interface for LlamaCore.
 interface ILlamaCore {
+  error InvalidSignature();
+
   error PolicyholderDoesNotHavePermission();
 
+  /// @dev The action is not in the expected state.
+  /// @param current The current state of the action.
+  error InvalidActionState(ActionState current);
+
   function actionGuard(address target, bytes4 selector) external view returns (address guard);
 
   function actionsCount() external view returns (uint256);

test/PeripheryTestSetup.sol

@@ -35,6 +35,9 @@ contract PeripheryTestSetup is Test {
   address coreTeam4 = 0x6b45E38c87bfCa15ee90AAe2AFe3CFC58cE08F75;
   address coreTeam5 = 0xbdfcE43E5D2C7AA8599290d940c9932B8dBC94Ca;
 
+  address tokenHolder;
+  uint256 tokenHolderPrivateKey;
+
   // Function selectors used in tests.
   bytes4 public constant SET_ROLE_HOLDER_SELECTOR = 0x2524842c; // pause(bool)
 
@@ -51,5 +54,6 @@ contract PeripheryTestSetup is Test {
 
   function setUp() public virtual {
     vm.createSelectFork(MAINNET_RPC_URL, 18_707_845);
+    (tokenHolder, tokenHolderPrivateKey) = makeAddrAndKey("tokenHolder");
   }
 }