T-19 Update == (#18)

lib/basic_temperature.rb

@@ -108,7 +108,11 @@ def to_kelvin
   def ==(other)
     return false unless other.instance_of?(BasicTemperature)
 
-    self.degrees == other.degrees && self.scale == other.scale
+    if self.scale == other.scale
+      self.degrees == other.degrees
+    else
+      self.to_scale(other.scale).degrees == other.degrees
+    end
   end
 
   def +(other)

spec/basic_temperature_spec.rb

@@ -309,39 +309,49 @@
       it 'returns false' do
         temperature = BasicTemperature.new(0, 'celcius')
 
-        other_temperature = nil
+        other = nil
 
-        expect(temperature == other_temperature).to eq(false)
+        expect(temperature == other).to eq(false)
       end
     end
 
-    context 'when temperature and other temperature do NOT have equal degrees' do
-      it 'returns false' do
-        temperature = BasicTemperature.new(0, 'celcius')
-
-        other_temperature = BasicTemperature.new(15, 'celcius')
+    context 'when temperatures have the same scale' do
+      context 'when temperatures have different degrees' do
+        it 'returns false' do
+          temperature = BasicTemperature.new(0, 'celcius')
+          other = BasicTemperature.new(15, 'celcius')
 
-        expect(temperature == other_temperature).to eq(false)
+          expect(temperature == other).to eq(false)
+        end
       end
-    end
-
-    context 'when temperature and other temperature do NOT have equal scales' do
-      it 'returns false' do
-        temperature = BasicTemperature.new(0, 'celcius')
 
-        other_temperature = BasicTemperature.new(0, 'kelvin')
+      context 'when temperatures have the same degrees' do
+        it 'returns true' do
+          temperature = BasicTemperature.new(0, 'celcius')
+          other = BasicTemperature.new(0, 'celcius')
 
-        expect(temperature == other_temperature).to eq(false)
+          expect(temperature == other).to eq(true)
+        end
       end
     end
 
-    context 'when temperature and other temperature have equal degrees and scales' do
-      it 'returns true' do
-        temperature = BasicTemperature.new(0, 'celcius')
+    context 'when temperatures have different scales' do
+      context 'when converted first temperature does NOT have the same degrees as second temperature' do
+        it 'returns false' do
+          temperature = BasicTemperature.new(0, 'celcius')
+          other = BasicTemperature.new(0, 'kelvin')
 
-        other_temperature = BasicTemperature.new(0, 'celcius')
+          expect(temperature == other).to eq(false)
+        end
+      end
+
+      context 'when converted first temperature has the same degrees as second temperature' do
+        it 'returns true' do
+          temperature = BasicTemperature.new(0, 'celcius')
+          other = BasicTemperature.new(273.15, 'kelvin')
 
-        expect(temperature == other_temperature).to eq(true)
+          expect(temperature == other).to eq(true)
+        end
       end
     end
   end