let a = new ObjectId("4c1a478603eba73620000000");
let b = new ObjectId("4c1a478603eba73620000000");
let c = new ObjectId();

assert.eq(a.toString(), b.toString(), "A");
assert.eq(a.toString(), 'ObjectId("4c1a478603eba73620000000")', "B");

assert(a.equals(b), "C");

assert.neq(a.toString(), c.toString(), "D");
assert(!a.equals(c), "E");