Tests are correct. We don't know what you are printing, we don't know which language you are using. Make sure to follow carefully the description. Anyway, this is not a suggestion (?).

You should have a look there: https://docs.codewars.com/training/troubleshooting/

I found out that:

a = []
b = []
comp(a,b)
Expected: true

But instructions says othewise

Same here

You must put quotes around fmt. Not a kata issue.

I don't do Go, so I wouldn't know :P

@B1ts it's a standard codewars compiler.

Now you know what you have to do (and it is explicitly stated in the description).

It's normal fmt shows an empty slice when printing nil here: in this case nil is the value of an uninitialized container (and has length 0...). Go subtleties...

Looking at the tests suite, actually the last test you see is with 2 nil inputs. Not sure why your code prints them as []

As already was mentioned by @GurovSD, Golang has a problem.
Two tests with an empty arrays. According to tests, the first result should be true and the second is false.
Look at this output:

[121 144 19 161 19 144 19 11]
[121 14641 20736 361 25921 361 20736 361]
true

[121 144 19 161 19 144 19 11]
[231 14641 20736 361 25921 361 20736 361]
false

[121 144 19 161 19 144 19 11]
[121 14641 20736 36100 25921 361 20736 361]
false

[]
[]
true

[]
[25 49]
false

[121 144 19 161 19 144 19 11 1008]
[121 14641 20736 36100 25921 361 20736 361]
false

[-10000000 100000000]
[100000000000000 10000000000000000]
true

[10000001 100000000]
[100000000000000 10000000000000000]
false

[2 2 3]
[4 9 9]
false

[2 2 3]
[4 4 9]
true

[-121 -144 19 -161 19 -144 19 -11]
[121 14641 20736 361 25921 361 20736 361]
true

[]
[121 14641 20736 361 25921 361 20736 361]
false

[]
[]
true

Test Failed
Log
Expected
    <bool>: true
to equal
    <bool>: false

Absolutely the same issue in Golang.
Look at this output:

[121 144 19 161 19 144 19 11]
[121 14641 20736 361 25921 361 20736 361]
true

[121 144 19 161 19 144 19 11]
[231 14641 20736 361 25921 361 20736 361]
false

[121 144 19 161 19 144 19 11]
[121 14641 20736 36100 25921 361 20736 361]
false

[]
[]
true

[]
[25 49]
false

[121 144 19 161 19 144 19 11 1008]
[121 14641 20736 36100 25921 361 20736 361]
false

[-10000000 100000000]
[100000000000000 10000000000000000]
true

[10000001 100000000]
[100000000000000 10000000000000000]
false

[2 2 3]
[4 9 9]
false

[2 2 3]
[4 4 9]
true

[-121 -144 19 -161 19 -144 19 -11]
[121 14641 20736 361 25921 361 20736 361]
true

[]
[121 14641 20736 361 25921 361 20736 361]
false

[]
[]
true
Test Failed
Log
Expected
    <bool>: true
to equal
    <bool>: false

Oh, thank you! Did not notice that. Just fixed it.

Your code returnrs true for a = 100, b = 1 and c = 1.