Function expectNoMutation

test/app/lib/world/vector.spec.js:64–69

(fn)

  xit("doesn't mutate when in player code", function() {
    // We can't run these tests easily because it depends on being in interpreter mode now
    const expectNoMutation = function(fn) {
      const v = new Vector(5, 5);
      const v2 = fn(v);
      expect(v.x).toEqual(5);
      return expect(v).not.toBe(v2);
    };

    expectNoMutation(v => v.normalize());
    expectNoMutation(v => v.limit(2));