Undeclared identifier solidity

Smart Contracts
1

I'm trying to execute some unit tests on a very basic smart contract to store and retrieve a number using the Remix IDE.

Smart Contract:

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;

/**
 * @title Storage
 * @dev Store & retrieve value in a variable
 */
contract Storage {

    uint256 number;

    /**
     * @dev Store value in variable
     * @param num value to store
     */
    function store(uint256 num) public {
        number = num;
    }

    /**
     * @dev Return value 
     * @return value of 'number'
     */
    function retrieve() public view returns (uint256){
        return number;
    }
}

These are the unit tests:

pragma solidity >=0.7.0 <0.9.0;
import "remix_tests.sol"; // this import is automatically injected by Remix.
import "../contracts/1_Storage.sol";

contract StorageTest {

    Storage storageToTest;
    uint256 number; 

    function beforeAll () public {
        number = 20;
        storageToTest = new Storage();
    }

    function test9 () public {
        storageToTest.store(number);
        //AssertEqual(20,20);
        AssertEqual(storageToTest.retrieve(), uint256(20), "retreive equal");
    }
}

I keep getting the error Undeclared identifier on the AssertEqual line. Any ideas ?

2

It seems the function is not AssertEqual but Assert.equal.