Ethereum: Unit test error: “AccessManagedUnauthorized” when minting ERC-20 token in a DAO project

Ethereum Unit Test Error: AccessManagedUnauthorized when minting an ERC-20 token in a DAO project

As a Solidity developer, you are probably familiar with the importance of thoroughly testing your code before deploying it to a live environment. However, when working on building a decentralized autonomous organization (DAO) using OpenZeppelin contracts, errors can occur due to issues with your unit tests or smart contract logic.

In this article, we will delve into a common error that can occur when minting an ERC-20 token in a DAO project: “AccessManagedUnauthorized”. We will provide you with instructions on how to identify and resolve this issue to ensure that your test suite passes smoothly.

What is AccessManagedUnauthorized?

The AccessManagedUnauthorized error occurs when the AccessManager contract attempts to access the admin permission level without proper authorization. This is typically seen in ERC-20 minting scenarios where the contract wants to verify the identity of the account owner and ensure that they have the necessary permissions before performing actions.

Common Causes of AccessManagedUnauthorized

• Insufficient Permissions: The ‘AccessManager’ contract may not be configured with sufficient permissions or access levels.

• Inconsistent Account Ownership: When accounts are created and updated, their roles (permissions) may not be synchronized correctly.

• Incorrect accessLevel setting

  : The accessLevel property in the AccessManager contract is used to define the required permission level for a particular action.

Testing for AccessManagedUnauthorized

To test this bug, you can follow these steps:

• Create Test Accounts: Set up test accounts with different roles and permissions using the OpenZeppelin RoleFactory.

• Mock-out Dependencies: Use mock functions to simulate interactions with contracts that might cause the bug.

• Test ERC-20 Token Minting: Write unit tests for the mint function in the AccessManager contract, ensuring that it calls the correct internal functions and verifies the required permissions.

Unit Test Example

import { AccessManager } from "./AccessManager.sol";
contract MintTest is AccessManager {
function testMint ERC20() public {
// Create a test account with administrator permission level
RoleFactory roleFactory = new RoleFactory();
Role accountRole = roleFactory.create("admin");
// Set accessLevel to "MANAGER"
accesslevel = 0x10; // AccessLevel(0x10) means "MANAGER"
// Mint ERC-20 token
mint(new address("0x1234567890abcdef"), address(accountrole), 100);
}
}

Solution

To resolve the “AccessManagedUnauthorized” error, make sure that your contract’s “accesslevel” is set correctly and is consistent across all accounts. You can use OpenZeppelin’s roleMapping function to synchronize permissions between roles.

Additionally, consider implementing role-based access control (RBAC) using a library like OpenZeppelin-RBAC. This will help you manage user permissions and reduce the likelihood of errors.

Best Practices

• Regularly review your contract’s permission levels to ensure they match the expected tasks.

• Use OpenZeppelin tools and libraries to streamline the development process and avoid common issues.

• Test thoroughly, including unit tests for individual components such as “AccessManager” and “RoleFactory”.

By following these guidelines and testing thoroughly, you can minimize the occurrence of “AccessManagedUnauthorized” errors when minting ERC-20 tokens in your DAO project. Happy coding!

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