test("Fib(6)", (t)=> {
    let results = [];
    for (let f of new Fib(6)) { results.push(f); }
    assert.deepStrictEqual(results,[0,1,1,2,3,5,8]);
});

test("Fib(42)", (t)=> {
    let result = -1;
    for (let f of new Fib(42)) { result = f; }
    assert.strictEqual(result,267914296);
});

test("Fib(2) destructure", (t)=> {
    let [a,b,c] = new Fib(6);
    assert.deepStrictEqual([a,b,c],[0,1,1]);
});

test("Fib(6) spread", (t)=> {
    assert.deepStrictEqual([...new Fib(6)], [0,1,1,2,3,5,8]);
});