```ruby
require "test/unit"
require "shoulda"

class FizzBuzz
  def self.fizzable?(n)
    n % 3 == 0
  end
  def self.buzzable?(n)
    n % 5 == 0
  end
  def self.say(n)
    return "Fizz" if fizzable? n
    return "Buzz" if buzzable? n
    n.to_s 
  end
end

class TestFizzbuzz < Test::Unit::TestCase

  should "say 1 for 1" do
    assert_equal "1", FizzBuzz.say(1)
  end

  should "say 2 for 2" do
    assert_equal "2", FizzBuzz.say(2)
  end

  should "say Fizz for multiples of 3" do
    assert_equal "Fizz", FizzBuzz.say(3)
    assert_equal "Fizz", FizzBuzz.say(6)
  end

  should "say 4 for 4" do
    assert_equal "4", FizzBuzz.say(4)
  end

  should "say Buzz for multiples of 5" do
    assert_equal "Buzz", FizzBuzz.say(5)
    assert_equal "Buzz", FizzBuzz.say(10)
  end

end
```

Refactor tests to improve readability (also tests need this)
user
```ruby
require "test/unit"
require "shoulda"

class FizzBuzz
  def self.fizzable?(n)
    n % 3 == 0
  end
  def self.buzzable?(n)
    n % 5 == 0
  end
  def self.say(n)
    return "Fizz" if fizzable? n
    return "Buzz" if buzzable? n
    n.to_s 
  end
end

class TestFizzbuzz < Test::Unit::TestCase

  should "say Fizz for multiples of 3" do
    assert_equal "Fizz", FizzBuzz.say(3)
    assert_equal "Fizz", FizzBuzz.say(6)
  end

  should "say Buzz for multiples of 5" do
    assert_equal "Buzz", FizzBuzz.say(5)
    assert_equal "Buzz", FizzBuzz.say(10)
  end

  should "say the number for the rest" do
    assert_equal "1", FizzBuzz.say(1)
    assert_equal "2", FizzBuzz.say(2)
    assert_equal "4", FizzBuzz.say(4)
  end

end
```
assistant