merge request model specs

spec/models/merge_request_spec.rb

 require 'spec_helper'
 describe MergeRequest do
-  pending "add some examples to (or delete) #{__FILE__}"
+  describe "Associations" do
+    it { should belong_to(:project) }
+    it { should belong_to(:author) }
+    it { should belong_to(:assignee) }
+  end
+
+  describe "Validation" do
+    it { should validate_presence_of(:target_branch) }
+    it { should validate_presence_of(:source_branch) }
+    it { should validate_presence_of(:title) }
+    it { should validate_presence_of(:author_id) }
+    it { should validate_presence_of(:project_id) }
+    it { should validate_presence_of(:assignee_id) }
+  end
+
+  describe "Scope" do
+    it { MergeRequest.should respond_to :closed }
+    it { MergeRequest.should respond_to :opened }
+  end
+
+  it { Factory.create(:merge_request,
+                      :author => Factory(:user),
+                      :assignee => Factory(:user),
+                      :project => Factory.create(:project)).should be_valid }
 end