使用Mocha/Chai对条件if/else语句进行单元测试

// 引入所需的库和模块
const assert = require('chai').assert;

// 要测试的函数或代码块
function checkNumber(num) {
  if (num > 0) {
    return 'Positive';
  } else if (num < 0) {
    return 'Negative';
  } else {
    return 'Zero';
  }
}

// 编写测试用例
describe('checkNumber', function() {
  it('should return "Positive" when input is a positive number', function() {
    assert.equal(checkNumber(5), 'Positive');
    assert.equal(checkNumber(10), 'Positive');
  });

  it('should return "Negative" when input is a negative number', function() {
    assert.equal(checkNumber(-5), 'Negative');
    assert.equal(checkNumber(-10), 'Negative');
  });

  it('should return "Zero" when input is zero', function() {
    assert.equal(checkNumber(0), 'Zero');
  });
});