try catch test internal method

test-internal.md

class Foo
{
    private function bar($languageId)
    {
        // like http call...
        
        // some heavy task
    }
    
    public function BarCall($languageId)
    {
         if (empty($languageId)) {
              throw new \Exception('must not be empty');
         }
         
         try {
              $this->bar($languageId);
         } catch (\Exception $e) {
              throw new \Exception('cannot connect');
         }
    }
}

Question: how to appropriatery test BarCall() method ?

It looks like you can provoke an exception with $languageId. A non empty but invalid one should do the trick. If there are multiple possible exceptions in bar(), then it's going to be hard to test them seperatly, because BarCall() catches them and throws its own exception. So all you can test with the annotation @ExpectedException is the same one for every thrown exception in bar(). I don't know any way to test an embedded previous exception (since PHP 5.3) with phpunit.

How can you tell that BarCall()/bar() worked? What happens after everything was correct?