Test: fixes SPARQL query results isomorphism

testsuite/src/sparql_evaluator.rs

@@ -453,7 +453,8 @@ fn are_query_results_isomorphic(
 
 fn compare_solutions(expected: &[(Variable, Term)], actual: &[(Variable, Term)]) -> bool {
     let mut bnode_map = HashMap::new();
-    expected.iter().zip(actual).all(
+    expected.len() == actual.len()
+        && expected.iter().zip(actual).all(
             move |((expected_variable, expected_value), (actual_variable, actual_value))| {
                 expected_variable == actual_variable
                     && compare_terms(