Add PostCreator#create!.

spec/components/post_creator_spec.rb

@@ -9,10 +9,10 @@ describe PostCreator do
   end
 
   let(:user) { Fabricate(:user) }
+  let(:topic) { Fabricate(:topic, user: user) }
 
   context "new topic" do
     let(:category) { Fabricate(:category, user: user) }
-    let(:topic) { Fabricate(:topic, user: user) }
     let(:basic_topic_params) { {title: "hello world topic", raw: "my name is fred", archetype_id: 1} }
     let(:image_sizes) { {'http://an.image.host/image.jpg' => {"width" => 111, "height" => 222}} }
 
@@ -444,7 +444,7 @@ describe PostCreator do
 
   # more integration testing ... maximise our testing
   context 'existing topic' do
-    let!(:topic) { Fabricate(:topic, user: user) }
+    let(:topic) { Fabricate(:topic, user: user) }
     let(:creator) { PostCreator.new(user, raw: 'test reply', topic_id: topic.id, reply_to_post_number: 4) }
 
     it 'ensures the user can create the post' do
@@ -752,8 +752,6 @@ describe PostCreator do
   end
 
   context "events" do
-    let(:topic) { Fabricate(:topic, user: user) }
-
     before do
       @posts_created = 0
       @topics_created = 0
@@ -796,7 +794,25 @@ describe PostCreator do
       expect(topic_user.notification_level).to eq(TopicUser.notification_levels[:watching])
       expect(topic_user.notifications_reason_id).to eq(TopicUser.notification_reasons[:auto_watch])
     end
+  end
 
+  describe '#create!' do
+    it "should return the post if it was successfully created" do
+      title = "This is a valid title"
+      raw = "This is a really awesome post"
+
+      post_creator = PostCreator.new(user, title: title, raw: raw)
+      post = post_creator.create
+
+      expect(post).to eq(Post.last)
+      expect(post.topic.title).to eq(title)
+      expect(post.raw).to eq(raw)
+    end
+
+    it "should raise an error when post fails to be created" do
+      post_creator = PostCreator.new(user, title: '', raw: '')
+      expect { post_creator.create! }.to raise_error(ActiveRecord::RecordNotSaved)
+    end
   end
 
 end