feat: generating random tax code

lib/itax_code.rb

@@ -43,5 +43,12 @@ def valid?(tax_code)
     rescue Parser::Error
       false
     end
+
+    # Encodes random tax code.
+    #
+    # @return [String]
+    def random
+      Encoder.new(Utils.random_person_data).encode
+    end
   end
 end

lib/itax_code/utils.rb

@@ -81,6 +81,16 @@ def countries
         CSV.foreach("#{__dir__}/data/countries.csv", headers: true)
       end
 
+      def random_person_data
+        {
+          surname: random_string,
+          name: random_string,
+          gender: %w[F M].sample,
+          birthdate: random_birthday,
+          birthplace: %w[H501 F205 D612 E256].sample # Milan, Rome, Naples, Turin
+        }
+      end
+
       private
 
         def omocodia_letters
@@ -150,6 +160,30 @@ def omocodia
             "5": "R", "6": "S", "7": "T", "8": "U", "9": "V"
           }
         end
+        def random_string
+          (0...6).map { (65 + rand(26)).chr }.join
+        end
+
+        def random_birthday
+          days_in_months = {1 => 31,
+                  2 => 28,
+                  3 => 31,
+                  4 => 30,
+                  5 => 31,
+                  6 => 30,
+                  7 => 31,
+                  8 =>31,
+                  9 =>30,
+                  10 =>31,
+                  11 =>30,
+                  12 =>31,
+          }
+          year = rand(1930..2006)
+          month = rand(1..12)
+          day = rand(1..days_in_months[month])
+
+          "#{year}-#{month}-#{day}"
+        end
     end
   end
 end

test/itax_code/utils_test.rb

@@ -40,10 +40,19 @@ class UtilsTest < Minitest::Test
       end
     end
 
+    test "random person data structure contains expected keys" do
+        expected_keys = [:surname, :name, :gender, :birthdate, :birthplace]
+
+        expected_keys.each do |key|
+          assert klass.random_person_data.key?(key), "Expected key #{key} to be present in the hash"
+        end
+    end
+
+
     private
 
-      def klass
-        Utils
-      end
+    def klass
+      Utils
+    end
   end
 end

test/itax_code_test.rb

@@ -27,6 +27,10 @@ class ItaxCodeTest < Minitest::Test
     refute klass.valid?("WRONG")
   end
 
+  test "#random" do
+    assert_equal 16, klass.random.length
+  end
+
   private
 
     def klass