javascript - What does this.timeout() do in a mocha test?

Question

I am new to javascript, I would like to know what does this.timeout() do in this mocha test.

it('TestConnect', async function() {
    this.timeout(40000);
});

Answer 1

Consider the following example:

describe('a suite of tests', function() {
  this.timeout(500);

  it('should take less than 500ms', function(done) {
    setTimeout(done, 600); // fails
  });

  it('should take less than 500ms as well', function(done) {
    setTimeout(done, 250); // passes
  });
});

I already looked into it, it says how to set timeouts, but didn't explain what is a timeout. Does the program exit after specified number of seconds or does the program wait for specified number of seconds before executing ?

The program doesn't necessarily exit, but the above (example) suite fails. The timeout parameter just means that tests in that suite, or a specific test that it has to call done within the timeout period else the test fails.