code: function notDeepEqual(actual, expected, message) {
      if (!isDeepEqual(actual, expected)) {
        this.pass(message);
      }
      else {
        this.fail({
          actual: actual,
          expected: expected,
          message: message,
          operator: "notDeepEqual"
        });
      }
    }
docs: The non-equivalence assertion tests for any deep (with `===`) inequality.
  @example
  assert.notDeepEqual({ a: "foo" }, Object.create({ a: "foo" }),
  "object"s inherit from different prototypes");