diff --git a/stix2/test/test_datastore_filesystem.py b/stix2/test/test_datastore_filesystem.py
index bd1f02c..4139ab1 100644
--- a/stix2/test/test_datastore_filesystem.py
+++ b/stix2/test/test_datastore_filesystem.py
@@ -7,7 +7,6 @@ import pytest
 from stix2 import (Bundle, Campaign, CustomObject, FileSystemSink,
                    FileSystemSource, FileSystemStore, Filter, Identity,
                    Indicator, Malware, Relationship, properties)
-
 from stix2.test.constants import (CAMPAIGN_ID, CAMPAIGN_KWARGS, IDENTITY_ID,
                                   IDENTITY_KWARGS, INDICATOR_ID,
                                   INDICATOR_KWARGS, MALWARE_ID, MALWARE_KWARGS,
diff --git a/stix2/test/test_datastore_filters.py b/stix2/test/test_datastore_filters.py
index 8803e4b..5ffd051 100644
--- a/stix2/test/test_datastore_filters.py
+++ b/stix2/test/test_datastore_filters.py
@@ -4,7 +4,6 @@ from stix2 import parse
 from stix2.datastore.filters import Filter, apply_common_filters
 from stix2.utils import STIXdatetime, parse_into_datetime
 
-
 stix_objs = [
     {
         "created": "2017-01-27T13:49:53.997Z",
diff --git a/stix2/test/test_datastore_memory.py b/stix2/test/test_datastore_memory.py
index dcec813..7a5bf10 100644
--- a/stix2/test/test_datastore_memory.py
+++ b/stix2/test/test_datastore_memory.py
@@ -2,7 +2,7 @@ import pytest
 
 from stix2.datastore import CompositeDataSource, make_id
 from stix2.datastore.filters import Filter
-from stix2.datastore.memory import MemorySource, MemorySink
+from stix2.datastore.memory import MemorySink, MemorySource
 
 
 def test_add_remove_composite_datasource():
diff --git a/stix2/test/test_datastore_taxii.py b/stix2/test/test_datastore_taxii.py
index dd81cd4..f3b4f64 100644
--- a/stix2/test/test_datastore_taxii.py
+++ b/stix2/test/test_datastore_taxii.py
@@ -1,12 +1,12 @@
-from stix2 import (Bundle, ThreatActor, TAXIICollectionSink,
-                   TAXIICollectionSource, TAXIICollectionStore)
-from stix2.datastore.filters import Filter
-
 import json
-import pytest
 
-from taxii2client import Collection, _filter_kwargs_to_query_params
 from medallion.filters.basic_filter import BasicFilter
+import pytest
+from taxii2client import Collection, _filter_kwargs_to_query_params
+
+from stix2 import (Bundle, TAXIICollectionSink, TAXIICollectionSource,
+                   TAXIICollectionStore, ThreatActor)
+from stix2.datastore.filters import Filter
 
 COLLECTION_URL = 'https://example.com/api1/collections/91a7b528-80eb-42ed-a74d-c6fbd5a26116/'