Tests for event manager

gears/carto_gears_api/spec/carto_gears_api/events/event_manager_spec.rb

@@ -0,0 +1,60 @@
+require 'spec_helper'
+require 'carto_gears_api/events/event_manager'
+require 'carto_gears_api/events/base_event'
+
+describe CartoGearsApi::Events::EventManager do
+  class TestEvent < CartoGearsApi::Events::BaseEvent
+  end
+
+  class OtherEvent < CartoGearsApi::Events::BaseEvent
+  end
+
+  class NotAnEvent
+  end
+
+  let(:manager) { CartoGearsApi::Events::EventManager.send(:new) }
+
+  describe '#subscribe' do
+    it 'event type must be a subclass of BaseEvent' do
+      expect { manager.subscribe(NotAnEvent) {} }.to raise_error ArgumentError
+    end
+
+    it 'requires a block' do
+      expect { manager.subscribe(TestEvent) }.to raise_error ArgumentError
+    end
+
+    it 'subscribe with event and block' do
+      expect { manager.subscribe(TestEvent) {} }.not_to raise_error ArgumentError
+    end
+  end
+
+  describe '#notify' do
+    it 'triggers all subscribed events' do
+      handler = mock
+      handler.should_receive(:do).once
+      handler2 = mock
+      handler2.should_receive(:do).once
+
+      manager.subscribe(TestEvent) { handler.do }
+      manager.subscribe(TestEvent) { handler2.do }
+      manager.notify(TestEvent.new)
+    end
+
+    it 'should not trigger subscribers to other events' do
+      handler = mock
+      handler.should_receive(:do).never
+
+      manager.subscribe(TestEvent) { handler.do }
+      manager.notify(OtherEvent.new)
+    end
+
+    it 'should not trigger unsubscribed handlers' do
+      handler = mock
+      handler.should_receive(:do).never
+
+      descriptor = manager.subscribe(TestEvent) { handler.do }
+      manager.unsubscribe(descriptor)
+      manager.notify(TestEvent.new)
+    end
+  end
+end