Javascript 有没有办法使用jasmine单元测试来搜索spyOnProperty window.location.search？因为搜索是不可配置的

其抛出错误：搜索不可配置

it('should have search keyword', function () {
  spyOnProperty(window.location, 'search').and.returnValue("?q=jag");
  expect(window.location.search).toBe("?q=jag");
});

beforeEach(function () {
  window.history.pushState({}, '', "?q=jag");
})
it('should have search keyword', function () {
  expect(window.location.search).toBe("?q=jag");
  expect($('#decoder-search-bar-input').val()).toEqual('jag');
});