class Foo {
  static foo = "foo";
  bar = "bar";

  static test() {
    return Foo.foo;
  }

  test() {
    return this.bar;
  }
}

const f = new Foo();
expect("foo" in Foo).toBe(true)
expect("bar" in f).toBe(true)
expect(Foo.test()).toBe("foo")
expect(f.test()).toBe("bar")