sample_contract.ts

const SampleContract = artifacts.require("SampleContract");

contract("SampleContract", function (accounts) {
    it("...should store the value 89.", async function () {
        const simpleStorageInstance = await SampleContract.deployed();

        // Set value of 89
        await simpleStorageInstance.set(89, {from: accounts[1]});

        // Get stored value
        const storedData = await simpleStorageInstance.get();

        assert.equal(storedData.toString(), "89", "The value 89 was not stored.");
    });
});