This kata is brilliant, it took me quite some time to pass all the tests. Well done!

Similar to my solution, but more elegant! I like it!

This Kata is one of the best ones yet! I enjoyed it a lot! Good job mate!

I removed all tests where expected and actual values were switched. But there are still tests in the form

let k = global.expected;
assert.strictEqual(next(), k, "Modify expected variable");

Yes, there are also test cases in the form strictEqual(expected, next()).

Thanks for the response. What I noticed is that the test actually looks like this:

assert.strictEqual(expected, next(), "No modify expected variable");

If this is the case, it means that I need to return previous value of expected, not next, since expected was already executed, right?

This is truly interesting kata, but if this is the case then the whole kata is a bit missleading.

I will try to solve it either way!

The No modify expected variable test looks like this:

let k = global.expected;
assert.strictEqual(next(), k, "Modify expected variable");

Hint: you need to do something outside of the function next in order to pass this test. (The initial solution has this line: // Hint: Initial code.)

Please post your current solution in a comment with the spoiler flag.

The description actually said enough, it's on you to be creative and try to figure out what is happening. In realaity you rarely have 100% information of the problem, but instead you get only small portion of it and need to figure out a solution ;)

I can't pass No modify expected variable test, even though right before the return I see in the logs the correct value!

And I am not modifing the expected value so the error description makes no sense.

Can I get a hint what might be wrong? I am pretty sure that my solution should work.

wow...

How come?

I've been trying to solve it for one hour and still can't find the solution...

Just wanted to express my disappointment with level of this kata. The kata is actually interesting, but wrong level.