Replace messages fixtures with a factory.

test/factories/messages.rb

@@ -0,0 +1,21 @@
+FactoryGirl.define do
+  factory :message do
+    sequence(:title) { |n| "Message #{n}" }
+    sequence(:body) { |n| "Body text for message #{n}" }
+    sent_on Time.now
+
+    # FIXME: needs user factory
+    from_user_id 1
+
+    # FIXME: needs user factory
+    to_user_id 2
+
+    trait :unread do
+      message_read false
+    end
+
+    trait :read do
+      message_read true
+    end
+  end
+end