Rails3: scm: subversion: fix error of test_latest_changesets at unit model test

On Rails 3.1, ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection error raises.
For more details, see r7062.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7150 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/repository_subversion_test.rb

@@ -57,7 +57,10 @@ class RepositorySubversionTest < ActiveSupport::TestCase
     end
 
     def test_latest_changesets
+      assert_equal 0, @repository.changesets.count
       @repository.fetch_changesets
+      @project.reload
+      assert_equal NUM_REV, @repository.changesets.count
 
       # with limit
       changesets = @repository.latest_changesets('', nil, 2)