Add tests for Dataset parse return type as well

test/test_conjunctivegraph/test_conjunctive_graph.py

@@ -3,10 +3,10 @@
 """
 
 
-import pytest
-
 from io import StringIO
 
+import pytest
+
 from rdflib import ConjunctiveGraph, Graph
 from rdflib.namespace import NamespaceManager
 from rdflib.parser import StringInputSource

test/test_dataset/test_dataset.py

@@ -2,6 +2,7 @@
 import os
 import shutil
 import tempfile
+from io import StringIO
 from test.data import context1, likes, pizza, tarek
 from test.utils.namespace import EGSCHEME
 
@@ -25,6 +26,9 @@
 
 HOST = "http://localhost:3030"
 DB = "/db/"
+DATA = """
+<http://example.org/record/1> a <http://xmlns.com/foaf/0.1/Document> .
+"""
 
 pluginstores = []
 
@@ -262,3 +266,20 @@ def test_subgraph_without_identifier() -> None:
     ) == ("genid", genid_prefix)
 
     assert f"{subgraph.identifier}".startswith(genid_prefix)
+
+def test_parse_return_type():
+    g = Dataset()
+    g.parse(data=DATA, format='turtle')
+    assert type(g) is Dataset
+
+    g = Dataset()
+    g = g.parse(data=DATA, format='turtle')
+    assert type(g) is Dataset
+
+    g = Dataset()
+    g.parse(source=StringIO(DATA), format='turtle')
+    assert type(g) is Dataset
+
+    g = Dataset()
+    g = g.parse(source=StringIO(DATA), format='turtle')
+    assert type(g) is Dataset