为什么我在Mocha中的before（）钩子根本不运行？

Question

I have written this following code in a file named "example.js":

console.log('HI HI HI HI');

describe('hooks', function() {
  console.log('before before');
  before(function() {
    console.log('ok');
  });
  console.log('after before');  
})

Output of the code when i run "mocha example.js" is:

HI HI HI HI
before before
after before
  0 passing (1ms)

Why didn't the "ok" get printed? I thought the before() hook runs before all the code in the describe() block?

Answer 1

It is not printed because before is run before a test, and you don't have any.

Try add a test then it should run

console.log('1');

describe('hooks', function() {
  console.log('2');
  before(function() {
    console.log('4');
  });

  console.log('3');
  it('description', function() {
    console.log('5');
    // nothing more here but still a test
  })
})