How to resolve "TypeError: Cannot read property 'equal' of undefined" in Mocha

Question

当我运行以下两个代码文件mocha test/test.js时：

// index.js
const count = (string) => {
  if (string === "") {
    return {};
  } else {
    return 1;
  }
};

module.exports = count;

// test/test.js
const { expect } = require("chai");
const count = require("../index");

describe("count characters in string", () => {
  it("should return empty object literal when string is empty", () => {
    expect(count("")).to.eql({});
  });

  it("returns an object with a count of 1 for a single character", () => {
    expect(count("a").to.equal(1));
  });
});

测试 1 通过，但对于测试 2，出现以下错误：

  1) count characters in string
       returns an object with a count of 1 for a single character:
     TypeError: Cannot read property 'equal' of undefined
      at Context.<anonymous> (test/test.js:10:25)
      at processImmediate (internal/timers.js:456:21)

请问我应该如何解决这个错误并通过第二次测试？

谢谢。

Answer 1

expect(count("a").to.equal(1)); 应该是 expect(count("a")).to.equal(1);。括号位置错误。

How to resolve "TypeError: Cannot read property 'equal' of undefined" in Mocha

How to resolve "TypeError: Cannot read property 'equal' of undefined" in Mocha

javascript

mocha.js

chai