diff --git a/test/unit/components/conversation-preview.spec.ts b/test/unit/components/conversation-preview.spec.ts
index 2f54009..554dce2 100644
--- a/test/unit/components/conversation-preview.spec.ts
+++ b/test/unit/components/conversation-preview.spec.ts
@@ -18,12 +18,12 @@ describe('conversation preview component specs', () => {
     let conversationSelectedSubscription: Subscription;
     let messageReceivedSubscription: Subscription;
 
-    let conversationSelectedSubscriptionCallback; 
+    let conversationSelectedSubscriptionCallback;
     let messageReceivedSubscriptionCallback;
 
     beforeEach(() => {
         service = {
-            showConversation: (c, r) => {}
+            showConversation: (c, r) => { }
         } as ConversationService;
 
         ea = {
@@ -31,14 +31,14 @@ describe('conversation preview component specs', () => {
                 if (e === ConversationSelected) {
                     conversationSelectedSubscriptionCallback = d;
                     conversationSelectedSubscription = {
-                        dispose: () => {}
+                        dispose: () => { }
                     };
                     return conversationSelectedSubscription;
                 }
                 if (e === MessageReceived) {
                     messageReceivedSubscriptionCallback = d;
                     messageReceivedSubscription = {
-                        dispose: () => {}
+                        dispose: () => { }
                     };
                     return messageReceivedSubscription;
                 }
@@ -60,4 +60,97 @@ describe('conversation preview component specs', () => {
         // verify
         expect(service.showConversation).toHaveBeenCalledWith(component.conversation, router);
     });
+
+    describe('attached specs', () => {
+        let message: Message;
+        let conversation: Conversation;
+
+        beforeEach(() => {
+            conversation = new Conversation();
+            component.conversation = conversation;
+            conversation.messages = new Array<Message>();
+            message = new Message();
+            conversation.messages.push(message);
+        });
+
+        it('attached should subscribe to ConversationSelected and MessageReceived events', () => {
+            // act
+            component.attached();
+
+            // verify
+            expect(conversationSelectedSubscription).toBeDefined();
+            expect(conversationSelectedSubscriptionCallback).toBeDefined();
+            expect(messageReceivedSubscription).toBeDefined();
+            expect(messageReceivedSubscriptionCallback).toBeDefined();
+        });
+
+        it('attached should set last message', () => {
+            // prepare
+            message.text = 'test';
+
+            // act
+            component.attached();
+
+            // verify
+            expect(component.lastMessage).toBe(message.text);
+        });
+
+        describe('subscriptions specs', () => {
+            beforeEach(() => {
+                component.attached();
+            });
+
+            it('conversation selected should set isSelect to true when conversation ids match', () => {
+                // prepare
+                conversation.id = 'test';
+                component.isSelected = false;
+
+                // act
+                conversationSelectedSubscriptionCallback(new ConversationSelected(conversation));
+
+                // verify
+                expect(component.isSelected).toBe(true);
+            });
+
+            it("conversation selected should set isSelect to false when conversation ids doesn't match", () => {
+                // prepare
+                conversation.id = 'test';
+                component.isSelected = true;
+
+                // act
+                conversationSelectedSubscriptionCallback(new ConversationSelected(new Conversation()));
+
+                // verify@
+                expect(component.isSelected).toBe(false);
+            });
+
+            it("message received should add message to the conversation and set lastMessage", () => {
+                // prepare
+                conversation.id = 'test';
+                let m = new Message();
+                m.conversationId = conversation.id;
+                m.text = 'message received';
+
+                // act
+                messageReceivedSubscriptionCallback(new MessageReceived(m));
+
+                // verify@
+                expect(component.conversation.messages[0]).toBe(m);
+                expect(component.lastMessage).toBe(m.text);
+            });
+
+            it("detached should dispose subscriptions", () => {
+                // prepare
+                spyOn(messageReceivedSubscription, 'dispose');
+                spyOn(conversationSelectedSubscription, 'dispose');
+
+                // act
+                component.detached();
+
+                // verify@
+                expect(messageReceivedSubscription.dispose).toHaveBeenCalledTimes(1);
+                expect(conversationSelectedSubscription.dispose).toHaveBeenCalledTimes(1);
+            });
+        });
+    });
 });
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