allowUncaught is not working as expected

[yonida]

In my code there are cases where I might get some errors, which I'm fine with.
I looked around and found the allowUncaught flag to prevent uncaught errors to fail my tests.
Problem is, I don't really understand what this flag does, because the tests keep failing.

process.on = function(e, fn){
        if ('uncaughtException' == e) {
      global.onerror = function(err, url, line){
      fn(new Error(err + ' (' + url + ':' + line + ')'));
      return !mocha.allowUncaught;
    };
    uncaughtExceptionHandlers.push(fn);
  }
};

As you can see in the code, there is no way to block the fn callback in cause of uncaughtException.

If this flag is not intended for this use case, please add some proper documentation for it.

[lolmaus]

mocha.allowUncaught is designed to prevent mocha from catching exceptions, letting them fall through into the console for further inspection.

It does not prevent exceptions from breaking your tests.

[doublerebel]

@yonida I and others have the same issue, check out the solutions in #1985

[drazisil]

Being handled under #1985