fix data file unit tests #2116

test/unit/data_file_test.rb

@@ -193,11 +193,12 @@ class DataFileTest < ActiveSupport::TestCase
     df.reload
     rdf = df.to_rdf
     assert_not_nil rdf
-    # just checks it is valid rdf/xml and contains some statements for now
-    RDF::Reader.for(:rdfxml).new(rdf) do |reader|
-      assert reader.statements.count > 0
-      assert_equal RDF::URI.new("http://localhost:3000/data_files/#{df.id}"), reader.statements.first.subject
+    # just checks it is valid and contains some statements for now
+    graph = RDF::Graph.new do |graph|
+      RDF::Reader.for(:ttl).new(rdf) {|reader| graph << reader}
     end
+    assert graph.statements.count > 0
+    assert_equal RDF::URI.new("http://localhost:3000/data_files/#{df.id}"), graph.statements.first.subject
   end
 
   test 'cache_remote_content' do