Test for deposit from another erc20 contract to my contract, how do it right?

Smart Contracts
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1

I'm trying add deposit from one mock contract to my contract, but balance in my contract is zero. How I can do it right? Below is my code:

// imports
const { ethers, waffle } = require('hardhat')
const { deployContract } = waffle
// then
it('deposit USDT', async function () {
    const [walletUSDT, walletMatrix] = await ethers.getSigners()
    const tokenUSDT = await deployContract(walletUSDT, MockUSDT);
    const tokenMatrix = await deployContract(walletMatrix, MXToken);
    tokenUSDT.transfer(walletMatrix.address, 70)
    const test = await tokenMatrix.balanceOf(walletMatrix.address)
    console.log(test)
  })