Coffeescript: Tests not executed

[siebenschlaefer]

I was able to solve https://www.codewars.com/kata/check-and-mate and
https://www.codewars.com/kata/5313b713bb244a0eb20001fe by just executing a successful test:

Test.expect true

A solution of just

# comment

results in Time: 311ms Passed: 0 Failed: 1 Errors: 1.

This might be because both use embedded Javascript (with `) for their tests and it looks like that code is not executed.

[DonaldKellett]

I just tested the Kata Check and Mate as a guest and confirmed that this hack works for CoffeeScript but not JavaScript.

UPDATE: I also tested this with the other (7 kyu) Kata that @siebenschlaefer linked to with the exact same results. This appears to be a CoffeeScript-specific Issue and has nothing to do with the individual Kata affected.

[kazk]

I think this is caused by tests written as embedded JavaScript in the form:

`
test();
`

# CoffeeScript test from "Number-like counter" kata (simplified)
`
var c = new Counter();
Test.expect(c == 0, "c == 0 was false");
`

Reproducible with

add = (a, b) -> a + b

`
Test.assertEquals(add(1, 1), 2);
`

add = (a, b) -> a + b
# adding
Test.expect true
# makes this pass

I'm guessing having no test at all is considered a failure and adding one passing test works around it.

---

This issue only happens when the first backtick is followed by LF.

`Test.assertEquals(add(1, 1), 2);` # ok

`Test.assertEquals(add(1, 1),
2);`                               # ok

`
Test.assertEquals(add(1, 1), 2);
`                                  # not ok
`
Test.assertEquals(add(1, 1), 2);`  # not ok

This is because CoffeeScript runner combines the code like the following:

Test.handleError ->
  # setup
  # solution
  do ->
    # tests

and

`
Test.assertEquals(add(1, 1), 2);`

is

return
Test.assertEquals(add(1, 1), 2);;

inside do ->.

Also, more than one statement won't work. You can work around with

`(function() {
Test.assertEquals(add(1, 1), 2);
Test.assertEquals(add(1, 2), 3);
// ...
})()`

Maybe this used to work on older version of CoffeeScript, but I don't know the language enough to tell.

---

By the way, is this common on Codewars? Just wrapping the original JavaScript tests with backticks to have CoffeeScript translation?

[kazk]

Closing this because I'm not sure how to fix this from our end and workarounds are available.