I get these erros:
first handler calls - Expected: 1, instead got: undefined

first handler arguments - Expected: '[1, 2, 3, 'first', undefined, false]', instead got: 'undefined'
I can't understand it because when I log the handler function it shows that its args property has the correct values inside an array and its call property is 1.

Hi,

I didn't mean to imply that there was something wrong with the kata. I was just confused by the random tests. Thanks for the tip about printing the input to the console.

Okay, this is strange. I am getting a type error for an undefined object property but each time I run the attempt I pass a different number tests, even without changing the code. Doesn't it always run the same tests? How can I be passing 20 tests in some runs and 0 in others with the same code?

I also can't debug the type-erros since I am not being shown the input that produces it. It passes all the sample tests plus more sample inputs I came up with. I can't see why it would produce the type error.

Any suggestions?

Do I sense some sarcasm?