Fixes tests

src/store/numeric_encoder.rs

@@ -406,7 +406,7 @@ mod test {
         ];
         for term in terms {
             let encoded = encoder.encode_term(&term).unwrap();
-            assert_eq!(term, encoder.decode_term(&encoded).unwrap())
+            assert_eq!(term, encoder.decode_term(encoded).unwrap())
         }
     }
 

tests/rdf_test_cases.rs

@@ -17,7 +17,6 @@ use rudf::rio::turtle::read_turtle;
 use rudf::sparql::algebra::Query;
 use rudf::sparql::parser::read_sparql_query;
 use rudf::store::isomorphism::GraphIsomorphism;
-use rudf::store::Graph;
 use rudf::store::MemoryGraph;
 use std::error::Error;
 use std::fmt;