Fix mr controller specs

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/merge_request.rb

@@ -214,8 +214,8 @@ class MergeRequest < ActiveRecord::Base
     self.merge
   end
 
-  def automerge!(current_user, merge_commit_message = nil)
-    if Gitlab::Satellite::MergeAction.new(current_user, self).merge!(merge_commit_message) && self.unmerged_commits.empty?
+  def automerge!(current_user, commit_message = nil)
+    if Gitlab::Satellite::MergeAction.new(current_user, self).merge!(commit_message) && self.unmerged_commits.empty?
       self.merge!(current_user.id)
       true
     end
@@ -322,9 +322,10 @@ class MergeRequest < ActiveRecord::Base
   def merge_commit_message
     message = "Merge branch '#{source_branch}' into '#{target_branch}'"
     message << "\n\n"
-    message << title
+    message << title.to_s
     message << "\n\n"
-    message << description
+    message << description.to_s
+    message
   end
 
   private

spec/controllers/merge_requests_controller_spec.rb

@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Projects::MergeRequestsController do
   let(:project) { create(:project_with_code) }
   let(:user)    { create(:user) }
-  let(:merge_request) { create(:merge_request_with_diffs, target_project: project, source_project: project, target_branch: "bcf03b5d~3", source_branch: "bcf03b5d") }
+  let(:merge_request) { create(:merge_request_with_diffs, target_project: project, source_project: project, target_branch: "stable", source_branch: "master") }
 
   before do
     sign_in(user)
@@ -61,7 +61,7 @@ describe Projects::MergeRequestsController do
       it "should really be a git email patch with commit" do
         get :show, project_id: project.to_param, id: merge_request.iid, format: format
 
-        expect(response.body[0..100]).to start_with("From #{merge_request.commits.last.id}")
+        expect(response.body[0..100]).to start_with("From 6ea87c47f0f8a24ae031c3fff17bc913889ecd00")
       end
 
       it "should contain git diffs" do