Crash if a "describe" block does not have a callback function

[bahmutov]

reproduction in https://github.com/cypress-io/cypress-test-tiny branch empty-describe

• cypress-io/cypress-test-tiny@63a6828

Whenever describe has just a function, or just a name (without a callback function) Cypress (probably Mocha engine inside) dies a violent death. Both these crash with Uncaught TypeError: Cannot read property 'call' of undefined

describe(function page() {})

describe('nope')

Code at crash site

context.describe = context.context = function(title, fn) {
  var suite = Suite.create(suites[0], title);
  suite.file = file;
  suites.unshift(suite);
  fn.call(suite);
  suites.shift();
  return suite;
};

Note that tests without a callback function are fine, they are just pending, so it('works') has no problems.

• Cypress 3.0.1
• Mac

[lilaconlee]

Took a stab at a more specific error message instead of fixing to keep the same behavior as mocha:

Down to set the suite to pending if that's preferred.

[jennifer-shehane]

I confirmed this bug is still happening in Cypress 3.8.0

[jennifer-shehane]

This fails with a much better error - testing in Cypress 6.2.1. Closing as resolved.