Don't use assert_equal nil.

git-svn-id: http://svn.redmine.org/redmine/trunk@16072 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/lib/redmine/scm/adapters/mercurial_adapter_test.rb

@@ -447,7 +447,11 @@ class MercurialAdapterTest < ActiveSupport::TestCase
 
     def test_hgversion_for(hgversion, version)
       @adapter.class.expects(:hgversion_from_command_line).returns(hgversion)
+      if version
         assert_equal version, @adapter.class.hgversion
+      else
+        assert_nil @adapter.class.hgversion
+      end
     end
 
     def test_template_path_for(version, template)