sample-test.js

const assert = require("assert");

describe("Ethereum provider", function() {
  it("Should return the accounts", async function() {
    const accounts = await ethereum.send("eth_accounts");
    assert(accounts.length !== 0, "No account was returned");
  });
});

contract("Greeter", function() {
  it("Should give the correct greeting", async function() {
    const Greeter = artifacts.require("Greeter");
    const greeter = await Greeter.new("Hello, Buidler!");

    assert.equal(await greeter.greet(), "Hello, Buidler!");
  });
});