Added some missing model specs + PaperTrail session fix

spec/models/api_user_spec.rb

@@ -2,4 +2,50 @@ require 'rails_helper'
 
 describe ApiUser do
   it { should belong_to(:registrar) }
+
+  context 'with invalid attribute' do
+    before :all do
+      @api_user = ApiUser.new
+    end
+
+    it 'should not be valid' do
+      @api_user.valid?
+      @api_user.errors.full_messages.should match_array([
+        "Password Password is missing",
+        "Registrar Registrar is missing",
+        "Username Username is missing"
+      ])
+    end
+
+    it 'should not have any versions' do
+      @api_user.versions.should == []
+    end
+  end
+
+  context 'with valid attributes' do
+    before :all do
+      @api_user = Fabricate(:api_user)
+    end
+
+    it 'should be valid' do
+      @api_user.valid?
+      @api_user.errors.full_messages.should match_array([])
+    end
+
+    it 'should be valid twice' do
+      @api_user = Fabricate(:api_user)
+      @api_user.valid?
+      @api_user.errors.full_messages.should match_array([])
+    end
+
+    it 'should have one version' do
+      with_versioning do
+        @api_user.versions.should == []
+        @api_user.username = 'newusername'
+        @api_user.save
+        @api_user.errors.full_messages.should match_array([])
+        @api_user.versions.size.should == 1
+      end
+    end
+  end
 end