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This seems to be working fine:

contract("Sale", function(accounts) {
    let sale;
    let fromAddr = accounts[0];
    let amountToSend = "1000000000000000000";

    before(async function() {
        sale = await artifacts.require("Sale").new();
    });

    it("Test if can be payed", async function() {
        let res = await web3.eth.sendTransaction({
            from: fromAddr, 
            to: sale.address,  
            value: amountToSend
        });
        // if we reach here then the transaction has completed successfully
    });

    it("Test if contract received ether", async function() {
        let res = await web3.eth.getBalance(sale.address);
        assert(res.greaterThanOrEqualTo(amountToSend));
    });

    it("Catch if balanceOf "+fromAddr, async function() {
        let res = await sale.balanceOf.call(fromAddr);
        assert(res.greaterThanOrEqualTo(1));
    });
});