test: convert test/test_sparql/test_sparql_parser.py to pytest (#2063)

Most straight forward conversion from `unittest` to `pytest`.

test/test_sparql/test_sparql_parser.py

@@ -1,6 +1,5 @@
 import math
 import sys
-import unittest
 from typing import Set, Tuple
 
 from rdflib import Graph, Literal
@@ -13,7 +12,7 @@ def triple_set(graph: Graph) -> Set[Tuple[Node, Node, Node]]:
     return set(graph.triples((None, None, None)))
 
 
-class SPARQLParserTests(unittest.TestCase):
+class TestSPARQLParser:
     def test_insert_recursionlimit(self) -> None:
         # These values are experimentally determined
         # to cause the RecursionError reported in
@@ -38,13 +37,8 @@ def do_insert(self, resource_count: int) -> None:
         g0ntriples = g0.serialize(format="ntriples")
         g1 = Graph()
 
-        self.assertNotEqual(triple_set(g0), triple_set(g1))
+        assert triple_set(g0) != triple_set(g1)
 
         processUpdate(g1, f"INSERT DATA {{ {g0ntriples!s} }}")
 
-        self.assertEqual(triple_set(g0), triple_set(g1))
-
-
-if __name__ == "__main__":
-
-    unittest.main()
+        assert triple_set(g0) == triple_set(g1)