add test of ConjunctiveGraph operators

test/consistent_test_data/sportquads.trig

@@ -0,0 +1,21 @@
+@prefix foaf: <http://xmlns.com/foaf/0.1/> .
+@prefix ex: <http://example.org/graph/> .
+@prefix ont: <http://example.com/ontology/> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+
+ex:students {
+    <http://example.com/resource/student_10> a ont:Student ;
+        foaf:name "Venus Williams" .
+
+    <http://example.com/resource/student_20> a ont:Student ;
+        foaf:name "Demi Moore" .
+}
+
+ex:sports {
+    <http://example.com/resource/sport_100> a ont:Sport ;
+        rdfs:label "Tennis" .
+}
+
+ex:practise {
+    <http://example.com/resource/student_10> ont:practises <http://example.com/resource/sport_100> .
+}

test/test_conjunctivegraph_operator_combinations.py

@@ -0,0 +1,123 @@
+import os
+from rdflib import (
+    Graph,
+    ConjunctiveGraph,
+    URIRef,
+)
+
+
+michel = URIRef("urn:example:michel")
+tarek = URIRef("urn:example:tarek")
+bob = URIRef("urn:example:bob")
+likes = URIRef("urn:example:likes")
+hates = URIRef("urn:example:hates")
+pizza = URIRef("urn:example:pizza")
+cheese = URIRef("urn:example:cheese")
+
+c1 = URIRef("urn:example:context-1")
+c2 = URIRef("urn:example:context-2")
+
+sportquadstrig = open(
+    os.path.join(os.path.dirname(__file__), "consistent_test_data", "sportquads.trig")
+).read()
+
+
+def test_operators_with_conjunctivegraph_and_graph():
+
+    cg = ConjunctiveGraph()
+    cg.add((tarek, likes, pizza))
+    cg.add((tarek, likes, michel))
+
+    g = Graph()
+    g.add([tarek, likes, pizza])
+    g.add([tarek, likes, cheese])
+
+    assert len(cg + g) == 3  # adds cheese as liking
+
+    assert len(cg - g) == 1  # removes pizza
+
+    assert len(cg * g) == 1  # only pizza
+
+    assert len(cg ^ g) == 2  # removes pizza, adds cheese
+
+
+def test_reversed_operators_with_conjunctivegraph_and_graph():
+
+    cg = ConjunctiveGraph()
+    cg.add((tarek, likes, pizza))
+    cg.add((tarek, likes, michel))
+
+    g = Graph()
+    g.add([tarek, likes, pizza])
+    g.add([tarek, likes, cheese])
+
+    assert len(g + cg) == 3  # adds cheese as liking
+
+    assert len(g - cg) == 1  # removes pizza
+
+    assert len(g * cg) == 1  # only pizza
+
+    assert len(g ^ cg) == 2  # removes pizza, adds cheese
+
+
+def test_reversed_operators_with_conjunctivegraph_with_contexts_and_graph():
+
+    cg = ConjunctiveGraph()
+    cg.add((tarek, likes, pizza))
+    cg.add((tarek, likes, michel))
+    cg.parse(data=sportquadstrig, format="trig")
+
+    g = Graph()
+    g.add([tarek, likes, pizza])
+    g.add([tarek, likes, cheese])
+
+    assert len(g + cg) == 10  # adds cheese as liking plus sevenquads
+
+    assert len(list((g + cg).triples((None, None, None)))) == 10
+
+    assert len(g - cg) == 1  # removes pizza
+
+    assert len(g * cg) == 1  # only pizza
+
+    assert len(g ^ cg) == 9  # removes pizza, adds cheese and sevenquads
+
+
+def test_operators_with_two_conjunctivegraphs():
+
+    cg1 = ConjunctiveGraph()
+    cg1.add([tarek, likes, pizza])
+    cg1.add([tarek, likes, michel])
+
+    cg2 = ConjunctiveGraph()
+    cg2.add([tarek, likes, pizza])
+    cg2.add([tarek, likes, cheese])
+
+    assert len(cg1 + cg2) == 3  # adds cheese as liking
+
+    assert len(cg1 - cg2) == 1  # removes pizza from cg1
+
+    assert len(cg1 * cg2) == 1  # only pizza
+
+    assert len(cg1 + cg2) == 3  # adds cheese as liking
+
+    assert len(cg1 ^ cg2) == 2  # removes pizza, adds cheese
+
+
+def test_operators_with_two_conjunctivegraphs_one_with_contexts():
+
+    cg1 = ConjunctiveGraph()
+    cg1.add([tarek, likes, pizza])
+    cg1.add([tarek, likes, michel])
+
+    cg2 = ConjunctiveGraph()
+    cg2.add([tarek, likes, pizza])
+    cg2.add([tarek, likes, cheese])
+    cg2.parse(data=sportquadstrig, format="trig")
+
+    assert len(cg1 + cg2) == 10  # adds cheese as liking and all seven quads
+
+    assert len(cg1 - cg2) == 1  # removes pizza
+
+    assert len(cg1 * cg2) == 1  # only pizza
+
+    assert len(cg1 ^ cg2) == 9  # removes pizza