node.js - nodejs 茉莉花测试在'expect'上失败| 'undefined' 不是函数（评估 'expect(true).toBe(true)'）

Question

我已经设置了一个简单的规范：

describe("A suite", function() {
  it("contains spec with an expectation", function() {
    expect(true).toBe(true);
  });
});

当我跑步时，grunt jasmine我得到：

Running "jasmine:src" (jasmine) task
Testing jasmine specs via PhantomJS

 A suite
   × contains spec with an expectation
     TypeError: 'undefined' is not a function (evaluating 'expect(true).toBe(tru
e)') in file:///C:/Users/long-path-to-spec/testing-spec.js (line 4) (1)


1 spec in 0s.
>> 1 failures
Warning: Task "jasmine:src" failed. Use --force to continue.

Aborted due to warnings.

它似乎正在运行规范......它似乎知道“描述”和“它”是什么，但它似乎不知道“期望”？

有任何想法吗？