I cannot reproduce the failed test below on my local in js using node many versions or many browsers consoles with an instance of RegExp, the test is bogus:

Gentle fixed tests
100 fixed tests
"10" is not divisible by 7: expected true to equal false
Completed in 2ms

My tests:
true for
0: 0
false for
1: 1
false for
2: 10
false for
3: 11
false for
4: 100
false for
5: 101
false for
6: 110
true for
7: 111
false for
8: 1000
false for
9: 1001
false for
10: 1010
false for
11: 1011
false for
12: 1100
false for
13: 1101
true for
14: 1110
false for
15: 1111
false for
16: 10000
false for
17: 10001
false for
18: 10010
false for
19: 10011
false for
20: 10100
true for
21: 10101
false for
22: 10110
false for
23: 10111
false for
24: 11000
false for
25: 11001
false for
26: 11010
false for
27: 11011
true for
28: 11100
false for
29: 11101
false for
30: 11110
false for
31: 11111
false for
32: 100000
false for
33: 100001
false for
34: 100010
true for
35: 100011
false for
36: 100100
false for
37: 100101
false for
38: 100110
false for
39: 100111
false for
40: 101000
false for
41: 101001
true for
42: 101010
false for
43: 101011
false for
44: 101100
false for
45: 101101
false for
46: 101110
false for
47: 101111
false for
48: 110000
true for
49: 110001
false for
50: 110010
false for
51: 110011
false for
52: 110100
false for
53: 110101
false for
54: 110110
false for
55: 110111
true for
56: 111000
false for
57: 111001
false for
58: 111010
false for
59: 111011
false for
60: 111100
false for
61: 111101
false for
62: 111110
true for
63: 111111
false for
64: 1000000
false for
65: 1000001
false for
66: 1000010
false for
67: 1000011
false for
68: 1000100
false for
69: 1000101
....

If you failed a test you failed a test. Having passed some tests previously doesn't mean the following ones are wrong >_<

If the color changes, it's not the same kata...

I already asked, we are not allowed to change colors like in real life models. Do not ask them, they will downvote you!

What about if the favorite color changes?

thanks for the feedback

oh is it because what matters is the week that used the most towels
this is really smart i would have never thought of that

Other than this your solution is awesome.

The description states we can only receive these colors. Why would you check something else?

Not abstract; if we change the color preference this solution wont work because here it sorts lexically 'blue' vs 'red'