Cannot call method - mocha - mocha.js

Question

I am running some test in my first smart contract called Inbox.sol.
I want to call the method .message in order to see if it is equal to the default variable I use when I deploy the contract with web3.
My Inbox.sol code
pragma solidity >=0.6.12;
contract Inbox {
string public message;
function initialInbox(string memory initialMessage) public {
message = initialMessage;
}
function setMessage(string memory newMessage) public {
message = newMessage;
}
}
My test file with Mocha is:
let accounts
let inbox
beforeEach(async () => {
// Get a list of all accounts
accounts = await web3.eth.getAccounts()
// Use one of those account to deploy the contract
inbox = await new web3.eth.Contract(abi)
.deploy({ data: bytecode, arguments: [INITIAL_ARGUMENT]})
.send({ from: accounts[0], gas: GAS})
})
describe(('Inbox'), () => {
it("has a default message", async () => {
const message = await inbox.methods.message() // Returns a big object
console.log(message)
const messageCalled = await inbox.methods.message().call()
console.log(messageCalled) // Returns nothing
assert.strictEqual(message, INITIAL_ARGUMENT)
})
})

Answer 1

Your JS inbox variable is an instance of web3.eth.Contract (docs).
The inbox.methods.message() is an instance of a helper object (that's the "Returns a big object" in your comment) containing the .call() method, that you need to use when you want to perform a read-only call.
const message = await inbox.methods.message().call() // Returns the string
Docs: https://web3js.readthedocs.io/en/v1.3.4/web3-eth-contract.html#methods-mymethod-call

Answer 2

Change your code and add a contractor.
function constructor(string memory initialMessage) public {
message = initialMessage;
}
if you are using an older version of solidity for example ^0.4.17. you can create a constructor by create a method same name as your contract class.
function Inbox(string memory initialMessage) public {
message = initialMessage;
}