message: tests: use Object.assign instead of .copy()
diff: @@ -17,7 +17,7 @@ module('Unit | Validator | password-strength', hooks => {
  const validator = this.owner.lookup('validator:password-strength');
  const options = { min: i };
  const builtOptions = validator.buildOptions(options);
  - const message = await validator.validate(minima[i], builtOptions.copy());
  + const message = await validator.validate(minima[i], Object.assign({}, builtOptions));
  assert.equal(message, true);
  });
  }
  