Display gauges with no benchmarks as "Insufficient Data" with no key benchmark indicator

app/presenters/gauge_presenter.rb

@@ -27,7 +27,7 @@ class GaugePresenter
   end
 
   def percentage_for(number)
-    return 0 if number.nil?
+    return nil if number.nil?
     scale_minimum = @scale.warning_zone.low_benchmark
     scale_maximum = @scale.ideal_zone.high_benchmark
 

app/presenters/scale.rb

@@ -35,6 +35,8 @@ class Scale
 
   def zone_for_score(score)
     case score
+    when nil
+      insufficient_data
     when ideal_zone.low_benchmark..ideal_zone.high_benchmark
       ideal_zone
     when approval_zone.low_benchmark..approval_zone.high_benchmark

app/views/categories/_gauge_graph.html.erb

@@ -3,16 +3,18 @@
   viewBox="<%= viewbox.x %> <%= viewbox.y %> <%= viewbox.width %> <%= viewbox.height %>"
   class="<%= gauge_class %>"
 >
-  <path
-    class="gauge-fill <%= gauge.color_class %>"
-    d="<%= move_to(point: arc_start_point) %>
-       <%= draw_arc(radius: outer_radius, percentage: gauge.score_percentage, clockwise: true) %>
-       <%= draw_line_to(point: arc_end_line_destination(radius: inner_radius, percentage: gauge.score_percentage)) %>
-       <%= draw_arc(radius: inner_radius, percentage: 0, clockwise: false) %>
-       <%= draw_line_to(point: arc_end_line_destination(radius: outer_radius, percentage: 0)) %>"
-    fill="none"
-    stroke="none"
-  />
+  <% if gauge.score_percentage.present? %>
+    <path
+      class="gauge-fill <%= gauge.color_class %>"
+      d="<%= move_to(point: arc_start_point) %>
+         <%= draw_arc(radius: outer_radius, percentage: gauge.score_percentage, clockwise: true) %>
+         <%= draw_line_to(point: arc_end_line_destination(radius: inner_radius, percentage: gauge.score_percentage)) %>
+         <%= draw_arc(radius: inner_radius, percentage: 0, clockwise: false) %>
+         <%= draw_line_to(point: arc_end_line_destination(radius: outer_radius, percentage: 0)) %>"
+      fill="none"
+      stroke="none"
+    />
+  <% end %>
 
 
   <path
@@ -26,24 +28,26 @@
     stroke-width="<%= stroke_width %>"
   />
 
-  <line
-    class="zone-benchmark stroke-black"
-    x1="<%= benchmark_line_point(outer_radius, angle_for(percentage: gauge.key_benchmark_percentage)).x %>"
-    y1="<%= benchmark_line_point(outer_radius, angle_for(percentage: gauge.key_benchmark_percentage)).y %>"
-    x2="<%= benchmark_line_point(inner_radius, angle_for(percentage: gauge.key_benchmark_percentage)).x %>"
-    y2="<%= benchmark_line_point(inner_radius, angle_for(percentage: gauge.key_benchmark_percentage)).y %>"
-    stroke-width="<%= stroke_width %>"
-  />
+  <% if gauge.key_benchmark_percentage.present? %>
+    <line
+      class="zone-benchmark stroke-black"
+      x1="<%= benchmark_line_point(outer_radius, angle_for(percentage: gauge.key_benchmark_percentage)).x %>"
+      y1="<%= benchmark_line_point(outer_radius, angle_for(percentage: gauge.key_benchmark_percentage)).y %>"
+      x2="<%= benchmark_line_point(inner_radius, angle_for(percentage: gauge.key_benchmark_percentage)).x %>"
+      y2="<%= benchmark_line_point(inner_radius, angle_for(percentage: gauge.key_benchmark_percentage)).y %>"
+      stroke-width="<%= stroke_width %>"
+    />
 
-  <path
-    class="key-benchmark-indicator fill-black"
-    d="<%= move_to(point: indicator_tip) %>
-       <%= draw_line_to(point: indicator_right_corner) %>
-       <%= draw_line_to(point: indicator_left_corner) %>
-  <%= draw_line_to(point: indicator_tip) %>"
-    transform="rotate(<%= rotation_angle_for(percentage: gauge.key_benchmark_percentage) %> <%= arc_center.x %> <%= arc_center.y %>)"
-    stroke="none"
-  />
+    <path
+      class="key-benchmark-indicator fill-black"
+      d="<%= move_to(point: indicator_tip) %>
+         <%= draw_line_to(point: indicator_right_corner) %>
+         <%= draw_line_to(point: indicator_left_corner) %>
+    <%= draw_line_to(point: indicator_tip) %>"
+      transform="rotate(<%= rotation_angle_for(percentage: gauge.key_benchmark_percentage) %> <%= arc_center.x %> <%= arc_center.y %>)"
+      stroke="none"
+    />
+  <% end %>
 </svg>
 
 <span class="gauge-title <%= font_class %> fill-black"><%= gauge.title %></span>

spec/presenters/gauge_presenter_spec.rb

@@ -1,25 +1,6 @@
 require 'rails_helper'
 
 describe GaugePresenter do
-  # let(:academic_year) { create(:academic_year, range: '1989-90') }
-  # let(:school) { create(:school, name: 'Best School') }
-  # let(:subcategory_presenter) do
-  #   subcategory = create(:subcategory, name: 'A great subcategory')
-
-  #   measure1 = create(:measure, watch_low_benchmark: 4, growth_low_benchmark: 4.25, approval_low_benchmark: 4.5, ideal_low_benchmark: 4.75, subcategory: subcategory)
-  #   survey_item1 = create(:survey_item, measure: measure1)
-  #   create(:survey_item_response, survey_item: survey_item1, academic_year: academic_year, school: school, likert_score: 1)
-  #   create(:survey_item_response, survey_item: survey_item1, academic_year: academic_year, school: school, likert_score: 5)
-
-  #   measure2 = create(:measure, watch_low_benchmark: 1.25, growth_low_benchmark: 1.5, approval_low_benchmark: 1.75, ideal_low_benchmark: 2.0, subcategory: subcategory)
-  #   survey_item2 = create(:survey_item, measure: measure2)
-  #   create(:survey_item_response, survey_item: survey_item2, academic_year: academic_year, school: school, likert_score: 1)
-  #   create(:survey_item_response, survey_item: survey_item2, academic_year: academic_year, school: school, likert_score: 5)
-
-  #   create_survey_item_responses_for_different_years_and_schools(survey_item1)
-
-  #   return SubcategoryPresenter.new(subcategory: subcategory, academic_year: academic_year, school: school)
-  # end
   let(:scale) do
     Scale.new(
       watch_low_benchmark: 1.5,
@@ -30,7 +11,6 @@ describe GaugePresenter do
   end
   let(:score) { 3 }
 
-
   let(:gauge_presenter) { GaugePresenter.new(scale: scale, score: score) }
 
   it 'returns the key benchmark percentage for the gauge' do
@@ -117,4 +97,28 @@ describe GaugePresenter do
     end
   end
 
+  context 'when there are no benchmarks or score for the gauge' do
+    let(:scale) do
+      Scale.new(
+        watch_low_benchmark: nil,
+        growth_low_benchmark: nil,
+        approval_low_benchmark: nil,
+        ideal_low_benchmark: nil,
+      )
+    end
+    let(:score) { nil }
+
+    it 'returns the title of the zone' do
+      expect(gauge_presenter.title).to eq 'Insufficient Data'
+    end
+
+    it 'returns the color class for the gauge' do
+      expect(gauge_presenter.color_class).to eq 'fill-insufficient_data'
+    end
+
+    it 'returns the score percentage for the gauge' do
+      expect(gauge_presenter.score_percentage).to be_nil
+    end
+  end
+
 end