Add template class for coverage report badge

lib/gitlab/badge/coverage/template.rb

+module Gitlab
+  module Badge
+    module Coverage
+      ##
+      # Class that represents a coverage badge template.
+      #
+      # Template object will be passed to badge.svg.erb template.
+      #
+      class Template
+        STATUS_COLOR = {
+          good: '#4c1',
+          acceptable: '#b0c',
+          medium: '#dfb317',
+          low: '#e05d44',
+          unknown: '#9f9f9f'
+        }
+
+        def initialize(badge)
+          @entity = badge.entity
+          @status = badge.status
+        end
+
+        def key_text
+          @entity.to_s
+        end
+
+        def value_text
+          @status ? "#{@status}%" : 'unknown'
+        end
+
+        def key_width
+          62
+        end
+
+        def value_width
+          @status ? 32 : 58
+        end
+
+        def key_color
+          '#555'
+        end
+
+        def value_color
+          case @status
+          when nil then STATUS_COLOR[:unknown]
+          when 95..100 then STATUS_COLOR[:good]
+          when 90..95 then STATUS_COLOR[:acceptable]
+          when 75..90 then STATUS_COLOR[:medium]
+          when 0..75 then STATUS_COLOR[:low]
+          else
+            STATUS_COLOR[:unknown]
+          end
+        end
+
+        def key_text_anchor
+          key_width / 2
+        end
+
+        def value_text_anchor
+          key_width + (value_width / 2)
+        end
+
+        def width
+          key_width + value_width
+        end
+      end
+    end
+  end
+end

spec/lib/gitlab/badge/coverage/template_spec.rb

+require 'spec_helper'
+
+describe Gitlab::Badge::Coverage::Template do
+  let(:badge) { double(entity: 'coverage', status: 90) }
+  let(:template) { described_class.new(badge) }
+
+  describe '#key_text' do
+    it 'is always says coverage' do
+      expect(template.key_text).to eq 'coverage'
+    end
+  end
+
+  describe '#value_text' do
+    context 'when coverage is known' do
+      it 'returns coverage percentage' do
+        expect(template.value_text).to eq '90%'
+      end
+    end
+
+    context 'when coverage is unknown' do
+      before do
+        allow(badge).to receive(:status).and_return(nil)
+      end
+
+      it 'returns string that says coverage is unknown' do
+        expect(template.value_text).to eq 'unknown'
+      end
+    end
+  end
+
+  describe '#key_width' do
+    it 'has a fixed key width' do
+      expect(template.key_width).to eq 62
+    end
+  end
+
+  describe '#value_width' do
+    context 'when coverage is known' do
+      it 'is narrower when coverage is known' do
+        expect(template.value_width).to eq 32
+      end
+    end
+
+    context 'when coverage is unknown' do
+      before do
+        allow(badge).to receive(:status).and_return(nil)
+      end
+
+      it 'is wider when coverage is unknown to fit text' do
+        expect(template.value_width).to eq 58
+      end
+    end
+  end
+
+  describe '#key_color' do
+    it 'always has the same color' do
+      expect(template.key_color).to eq '#555'
+    end
+  end
+
+  describe '#value_color' do
+    context 'when coverage is good' do
+      before do
+        allow(badge).to receive(:status).and_return(98)
+      end
+
+      it 'is green' do
+        expect(template.value_color).to eq '#4c1'
+      end
+    end
+
+    context 'when coverage is acceptable' do
+      before do
+        allow(badge).to receive(:status).and_return(90)
+      end
+
+      it 'is green-orange' do
+        expect(template.value_color).to eq '#b0c'
+      end
+    end
+
+    context 'when coverage is medium' do
+      before do
+        allow(badge).to receive(:status).and_return(75)
+      end
+
+      it 'is orange-yellow' do
+        expect(template.value_color).to eq '#dfb317'
+      end
+    end
+
+    context 'when coverage is low' do
+      before do
+        allow(badge).to receive(:status).and_return(50)
+      end
+
+      it 'is red' do
+        expect(template.value_color).to eq '#e05d44'
+      end
+    end
+
+    context 'when coverage is unknown' do
+      before do
+        allow(badge).to receive(:status).and_return(nil)
+      end
+
+      it 'is grey' do
+        expect(template.value_color).to eq '#9f9f9f'
+      end
+    end
+  end
+
+  describe '#width' do
+    context 'when coverage is known' do
+      it 'returns the key width plus value width' do
+        expect(template.width).to eq 94
+      end
+    end
+
+    context 'when coverage is unknown' do
+      before do
+        allow(badge).to receive(:status).and_return(nil)
+      end
+
+      it 'returns key width plus wider value width' do
+        expect(template.width).to eq 120
+      end
+    end
+  end
+end