Morning has a different max BG

app/presenters/glucose_measurement_presenter.rb

@@ -41,8 +41,24 @@ def units
   end
 
   def highlight_class
+    return 'bg-high' if is_high
     return 'bg-high' if model.value > 8
-    return 'bg-low' if model.value < 4.5
-    nil
+    return 'bg-low' if is
+  end
+
+  def is_high
+    return true if model.value > 7 && is_morning
+    return true if model.value > 8
+    false
+  end
+
+  def is_low
+    return true if model.value < 4.5
+    false
+  end
+
+  def is_morning
+    time = model.datetime.strftime '%H:%M'
+    time > '06:30' && time < '11:00'
   end
 end

spec/presenters/glucose_measurement_presenter_spec.rb

@@ -64,5 +64,11 @@
     it 'has the correct css class for a high BG' do
       expect(decorated_high_bg.measurement_cell).to match /<td class='glucose-measurement-value bg-high'>/
     end
+
+    let(:high_am_bg) { create :glucose_measurement, value: 7.5, datetime: '2016-01-26 07:15:29' }
+    let(:decorated_high_am_bg) { GlucoseMeasurementPresenter.new high_am_bg }
+    it 'knows the limits are different in the morning' do
+      expect(decorated_high_am_bg.measurement_cell).to match /<td class='glucose-measurement-value bg-high'>/
+    end
   end
 end