🟢 Solve problem 412

Author: AF2B

ruby/412.rb

@@ -0,0 +1,38 @@
+require 'minitest/autorun'
+
+def fizz_buzz(n)
+  pre_condition(n)
+  result = []
+
+  (1..n).each do |i|
+    if i % 3 == 0 && i % 5 == 0
+      result << "FizzBuzz"
+    elsif i % 3 == 0
+      result << "Fizz"
+    elsif i % 5 == 0
+      result << "Buzz"
+    else
+      result << i.to_s
+    end
+  end
+
+  result
+end
+
+def pre_condition(value)
+  raise ArgumentError, "Argument must be an integer" unless value.is_a? Integer
+end
+
+class TestFizzBuzz < Minitest::Test
+  def test_fizz_buzz
+    assert_equal ["1", "2", "Fizz"], fizz_buzz(3)
+    assert_equal ["1", "2", "Fizz", "4", "Buzz"], fizz_buzz(5)
+    assert_equal ["1", "2", "Fizz", "4", "Buzz", "Fizz", "7", "8", "Fizz", "Buzz", "11", "Fizz", "13", "14", "FizzBuzz"], fizz_buzz(15)
+  end
+
+  def test_pre_condition
+    assert_raises ArgumentError do
+      fizz_buzz("a")
+    end
+  end
+end