Pattern generator

pattern_generator.rb

@@ -0,0 +1,35 @@
+require 'pry'
+
+class PatternGenerator
+
+  def self.generate_serial(pattern)
+    if pattern == 'N'
+      { patterns: ['0','1','2','3','4','5','6','7','8','9'], count: 10 }
+    elsif pattern == 'X'
+      { patterns: ('A'..'Z').to_a, count: 26}
+    end
+  end
+
+  def self.generate_serial(pattern)
+    all_patterns = []
+    pattern.split.each do |letter|
+      if pattern == 'N'
+        number_library.each do |number|
+          all_patterns << number
+        end
+        #do some crazy building here
+      elsif pattern == 'X'
+        #do some more crazy building here
+      end
+    end
+  end
+
+  def letter_library
+    ('A'..'Z').to_a
+  end
+
+  def number_library
+    ['0','1','2','3','4','5','6','7','8','9']
+  end
+
+end

pattern_generator_test.rb

@@ -0,0 +1,46 @@
+require 'minitest/autorun'
+require 'minitest/pride'
+require './pattern_generator'
+require 'pry'
+
+class PatternGeneratorTest < Minitest::Test
+  def setup
+    @pg = PatternGenerator
+  end
+
+  def test_it_works_for_a_single_number_character_pattern
+    result = @pg.generate_serial('N')
+
+    assert_equal result[:patterns], ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
+  end
+
+  def test_it_gives_a_count_of_the_patterns_for_a_single_character_number_pattern
+    result = @pg.generate_serial('N')
+
+    assert_equal result[:count], 10
+  end
+
+  def test_it_works_for_a_single_character_letter_pattern
+    result = @pg.generate_serial('X')
+
+    assert_equal result[:patterns], ('A'..'Z').to_a
+  end
+
+  def test_it_gives_a_count_of_the_patterns_for_a_single_character_letter_pattern
+    result = @pg.generate_serial('X')
+
+    assert_equal result[:count], 26
+  end
+
+  def test_two_character_number_combination_patterns_count
+    result = @pg.generate_serial('NN')
+
+    assert_equal result[:count], 81
+  end
+
+  def test_two_character_number_combination_patterns
+    result = @pg.generate_serial('NN')
+
+    assert_equal result[:patterns], ['01','02','03','04']
+  end
+end