TypeScript translation

The actual tests should be more comprehensive, such as unrelated classes, sibling classes, and inheritance beyond immediate parents.

Also, I'm not sure the current testing is even right: Animal is a trait while Dog is a class. They aren't even the same kind of object. (It's like testing a interface against a class that implements it.)

Does anyone know what the Number Theory is related to this problem? Thanks!

src/test/scala/fixture.scala:15: error: not found: type Primes
  var primes: Primes = _
              ^
src/test/scala/fixture.scala:18: error: not found: type Primes
    primes = new Primes()
                 ^

There're already many katas about prime numbers available on CW, this one doesn't seem to offer anything new.