test: ConjunctiveGraph operator return type (#2557)

This change adds tests for the return type of the `+`, `-`, `*`, and `^` operators on `ConjunctiveGraph` objects. - Closes <#652>
RDFLib · Aug 30, 2023 · e42b752 · e42b752
1 parent a8f20ae
commit e42b752
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/test/test_conjunctivegraph/test_conjunctivegraph_operator_combinations.py b/test/test_conjunctivegraph/test_conjunctivegraph_operator_combinations.py
@@ -100,3 +100,12 @@ def test_operators_with_two_conjunctivegraphs_one_with_contexts():
     assert len(cg1 * cg2) == 1  # only pizza
 
     assert len(cg1 ^ cg2) == 9  # removes pizza
+
+
+def test_operators_returning_correct_type():
+    g1 = ConjunctiveGraph()
+    g2 = ConjunctiveGraph()
+    assert type(g1 + g2) is ConjunctiveGraph
+    assert type(g1 - g2) is ConjunctiveGraph
+    assert type(g1 * g2) is ConjunctiveGraph
+    assert type(g1 ^ g2) is ConjunctiveGraph