Thanks to another comment, this is solved. The Kata description below is incorrect.

Any activities completed that are ranking 2 levels or more lower than the user's ranking will be ignored

A correct description would be:

Any activities completed that are ranking 2 levels or more lower than the user's ranking will be worth 1 point

Yes, JavaScript. I do get these failed tests (and others similar):

• After applying rank of -1 the progress was expected to be 21, but was actually 20
• After applying rank of 3 the progress was expected to be 61, but was actually 60

The class currently should do what the instructions describe, so I'm not sure what I am misunderstanding about the desired behaviour. Why should progress be 21, 61, 51, 91 etc. instead of 20, 60, 50, 90? What does this test look like?

After applying rank of -1 the progress was expected to be 21, but was actually 20

I am seeing this broken test. The only scenarios I can think of that should result in progress 21, are the following - but in these cases my class test suite passes.

user.rank = -2;
user.progress = 0;
for (let i=0; i<17; i++) { U.incProgress(-1); } // Complete 17 x -1 activities.
Test.assertEquals(user.rank, -1);               // Pass
Test.assertEquals(user.progress, 21);           // Pass

user.rank = -2;
user.progress = 1;
user.incProgress(-1);                           // Complete 2 x -1 activities
user.incProgress(-1);                           // starting from progress 1.
Test.assertEquals(user.rank, -2);               // Pass
Test.assertEquals(user.progress, 21);           // Pass

What am I missing here?

Removed comment, posted as issue instead of reply.

Thanks Hilary, Having several clans would work as well right? This field works as a comma separated list?