test: remove unused imports in test code

This patch removes unused imports in test code. This is mainly to remove
the potential snag for flake8/flakeheaven.

The actual cleanup was done with `pycln --all test`.

Also:
 - Remove superflous `pass` statements.

3 files changed, 2 insertions, 8 deletions

diff --git a/test/test_sparql/test_construct_bindings.py b/test/test_sparql/test_construct_bindings.py
index f8600998..643d4610 100644
--- a/test/test_sparql/test_construct_bindings.py
+++ b/test/test_sparql/test_construct_bindings.py
@@ -1,8 +1,7 @@
 import unittest
 from test.utils import eq_
 
-from rdflib import BNode, Graph, Literal, URIRef
-from rdflib.compare import isomorphic
+from rdflib import Graph, Literal, URIRef
 from rdflib.plugins.sparql import prepareQuery
 
 
diff --git a/test/test_sparql/test_datetime_processing.py b/test/test_sparql/test_datetime_processing.py
index b3179d55..41da92be 100644
--- a/test/test_sparql/test_datetime_processing.py
+++ b/test/test_sparql/test_datetime_processing.py
@@ -1,11 +1,8 @@
 import io
-from pprint import pprint
 from test.utils import eq_
 
 import rdflib
-from rdflib import XSD, BNode, Graph, Literal, URIRef
-from rdflib.compare import isomorphic
-from rdflib.plugins.sparql import prepareQuery
+from rdflib import Graph
 
 
 def test_dateTime_dateTime_subs_issue():
diff --git a/test/test_sparql/test_service.py b/test/test_sparql/test_service.py
index 31ba6e8a..c7d67a1a 100644
--- a/test/test_sparql/test_service.py
+++ b/test/test_sparql/test_service.py
@@ -22,9 +22,7 @@ from typing import (
 import pytest
 
 from rdflib import Graph, Literal, URIRef, Variable
-from rdflib.compare import isomorphic
 from rdflib.namespace import XSD
-from rdflib.plugins.sparql import prepareQuery
 from rdflib.term import BNode, Identifier