Update resistor-color-trio (#1794)

Author: meatball133

exercises/practice/resistor-color-trio/.meta/example.rb

@@ -1,17 +1,17 @@
 class ResistorColorTrio
   COLOR_CODES = %i[black brown red orange yellow green blue violet grey white].freeze
+  LABELS = %w[ohms kiloohms megaohms gigaohms teraohms].freeze
 
   def initialize(colors)
     @colors = colors.map(&:to_sym)
     @tens, @ones, @zeros = @colors
   end
 
   def label
-    "Resistor value: #{to_s}"
+    "Resistor value: #{self}"
   end
 
   private
-
   attr_reader :tens, :ones, :zeros
 
   def significants
@@ -27,6 +27,12 @@ def value
   end
 
   def to_s
-    value < 1000 ? "#{value} ohms" : "#{(value.to_f/1000).to_i} kiloohms"
+    index = 0
+    value_copy = value
+    while value_copy >= 1000 && index < LABELS.size - 1
+      value_copy /= 1000
+      index += 1
+    end
+    "#{value_copy} #{LABELS[index]}"
   end
 end

exercises/practice/resistor-color-trio/resistor_color_trio_test.rb

@@ -4,26 +4,71 @@
 class ResistorColorTrioTest < Minitest::Test
   def test_orange_and_orange_and_black
     # skip
-    assert_equal "Resistor value: 33 ohms", ResistorColorTrio.new(%w[orange orange black]).label
+    actual = ResistorColorTrio.new(%w[orange orange black]).label
+    expected = 'Resistor value: 33 ohms'
+    assert_equal expected, actual
   end
 
   def test_blue_and_grey_and_brown
     skip
-    assert_equal "Resistor value: 680 ohms", ResistorColorTrio.new(%w[blue grey brown]).label
+    actual = ResistorColorTrio.new(%w[blue grey brown]).label
+    expected = 'Resistor value: 680 ohms'
+    assert_equal expected, actual
   end
 
   def test_red_and_black_and_red
     skip
-    assert_equal "Resistor value: 2 kiloohms", ResistorColorTrio.new(%w[red black red]).label
+    actual = ResistorColorTrio.new(%w[red black red]).label
+    expected = 'Resistor value: 2 kiloohms'
+    assert_equal expected, actual
   end
 
   def test_green_and_brown_and_orange
     skip
-    assert_equal "Resistor value: 51 kiloohms", ResistorColorTrio.new(%w[green brown orange]).label
+    actual = ResistorColorTrio.new(%w[green brown orange]).label
+    expected = 'Resistor value: 51 kiloohms'
+    assert_equal expected, actual
   end
 
   def test_yellow_and_violet_and_yellow
     skip
-    assert_equal "Resistor value: 470 kiloohms", ResistorColorTrio.new(%w[yellow violet yellow]).label
+    actual = ResistorColorTrio.new(%w[yellow violet yellow]).label
+    expected = 'Resistor value: 470 kiloohms'
+    assert_equal expected, actual
+  end
+
+  def test_blue_and_violet_and_blue
+    skip
+    actual = ResistorColorTrio.new(%w[blue violet blue]).label
+    expected = 'Resistor value: 67 megaohms'
+    assert_equal expected, actual
+  end
+
+  def test_minimum_possible_value
+    skip
+    actual = ResistorColorTrio.new(%w[black black black]).label
+    expected = 'Resistor value: 0 ohms'
+    assert_equal expected, actual
+  end
+
+  def test_maximum_possible_value
+    skip
+    actual = ResistorColorTrio.new(%w[white white white]).label
+    expected = 'Resistor value: 99 gigaohms'
+    assert_equal expected, actual
+  end
+
+  def test_first_two_colors_make_an_invalid_octal_number
+    skip
+    actual = ResistorColorTrio.new(%w[black grey black]).label
+    expected = 'Resistor value: 8 ohms'
+    assert_equal expected, actual
+  end
+
+  def test_ignore_extra_colors
+    skip
+    actual = ResistorColorTrio.new(%w[blue green yellow orange]).label
+    expected = 'Resistor value: 650 kiloohms'
+    assert_equal expected, actual
   end
 end