attributes_spec.rb in woyo-world-0.0.9

- old
+ new

@@ -221,10 +221,68 @@
 
     end
 
   end
 
+  context 'listeners' do
+
+    let(:lat) { AttrTest.new }
+    let(:listener_class) do
+      class AttrListenerTest
+        attr_reader :changed_attribute, :changed_value
+        def notify attr,value
+          @changed_attribute = attr
+          @changed_value = value
+        end
+      end
+      AttrListenerTest
+    end
+
+    before :each do
+      lat.attribute say: "Hello"
+    end
+
+    it 'are notified of attribute changes' do
+      expect(lat.say).to eq "Hello"
+      listener = listener_class.new
+      lat.attributes.add_listener :say, listener
+      lat.say "Bye"
+      expect(listener.changed_attribute).to eq :say
+    end
+
+    it 'are not notified if value does not change' do
+      expect(lat.say).to eq "Hello"
+      listener = listener_class.new
+      lat.attributes.add_listener :say, listener
+      lat.say "Hello"
+      expect(listener.changed_attribute).to be_nil  
+    end
+
+    it 'are notified with attribute and value' do
+      expect(lat.say).to eq "Hello"
+      listener = listener_class.new
+      lat.attributes.add_listener :say, listener
+      lat.say "Bye"
+      expect(listener.changed_attribute).to eq :say
+      expect(listener.changed_value).to eq "Bye"
+    end
+
+    it 'may be multiple' do
+      expect(lat.say).to eq "Hello"
+      listener1 = listener_class.new
+      lat.attributes.add_listener :say, listener1
+      listener2 = listener_class.new
+      lat.attributes.add_listener :say, listener2
+      lat.say "Bye"
+      expect(listener1.changed_attribute).to eq :say
+      expect(listener1.changed_value).to eq "Bye"
+      expect(listener2.changed_attribute).to eq :say
+      expect(listener2.changed_value).to eq "Bye"
+    end
+
+  end
+
   context 'that are boolean have convenient instance accessors' do
 
     let(:bat) { class BooleanAttrTest; include Woyo::Attributes; end.new }
 
     before :each do
@@ -414,9 +472,56 @@
     end
 
     it 'returns empty list if no keys are truthy attributes' do
       hat.reaction hot: 'Sweat', warm: 'Relax', cool: 'Huddle', cold: 'Shiver' 
       expect(hat.reaction).to eq [ ]
+    end
+
+  end
+
+  context 'changes' do
+
+    let(:cat) { AttrTest.new }
+
+    before :each do
+      cat.attributes :one, :two, :three
+    end
+
+    it 'can be tracked' do
+      expect(cat.changes).to eq nil
+      cat.track_changes
+      expect(cat.changes).to be_instance_of Woyo::Attributes::ChangesHash
+      expect(cat.changes).to be_empty
+      cat.one = 1
+      cat.two = 2
+      expect(cat.changes.count).to eq 2
+      expect(cat.changes[:one]).to eq 1
+      expect(cat.changes[:two]).to eq 2
+    end
+
+    it 'tracking can be cleared' do
+      cat.track_changes
+      cat.three = 3
+      expect(cat.changes[:three]).to eq 3
+      cat.clear_changes
+      expect(cat.changes).to be_empty
+      cat.one = 1
+      expect(cat.changes[:one]).to eq 1
+    end
+
+    it 'tracking includes dependent attributes (hashes with attribute keys)' do
+      cat.attributes :reaction, :hot, :warm, :cool, :cold
+      cat.hot = true
+      cat.reaction hot: 'Sweat', warm: 'Relax', cool: 'Huddle', cold: 'Shiver'
+      cat.track_changes
+      cat.cold = true
+      cat.hot = false
+      changes = cat.changes
+      expect(changes.keys).to include :reaction
+      expect(changes[:reaction]).to eq "Shiver"
+      expect(changes[:cold]).to eq true
+      expect(changes[:hot]).to eq false
+      expect(changes.count).to eq 3
     end
 
   end
 
 end