diff --git a/test/unit/community_rating_test.rb b/test/unit/community_rating_test.rb
new file mode 100644
index 0000000..89e0e10
--- /dev/null
+++ b/test/unit/community_rating_test.rb
@@ -0,0 +1,37 @@
+require File.dirname(__FILE__) + '/../../../../test/test_helper'
+require File.dirname(__FILE__) + '/../helpers/plugin_test_helper'
+
+class CommunityRatingTest < ActiveSupport::TestCase
+  include PluginTestHelper
+
+  should "validate institution if there an institution_id" do
+    private_institution = build_private_institution "huehue", "hue", "11.222.333/4444-55"
+
+    assert_equal true, private_institution.save
+
+    rating = CommunityRating.new :institution_id => 123456
+    rating.valid?
+
+    assert_equal true, rating.errors[:institution].include?("not found")
+
+    rating.institution = private_institution
+    rating.valid?
+
+    assert_equal false, rating.errors[:institution].include?("not found")
+  end
+
+  private
+
+  def build_private_institution name, corporate_name, cnpj, country="AR"
+    community = Community.new :name => name
+    community.country = country
+
+    institution = PrivateInstitution.new :name=> name
+    institution.corporate_name = corporate_name
+    institution.cnpj = cnpj
+    institution.community = community
+
+    institution
+  end
+end
+
--
libgit2 0.21.2