diff --git a/stix2/test/v21/test_artifact.py b/stix2/test/v21/test_artifact.py
index 5c0e2eb4..2c68c0d2 100644
--- a/stix2/test/v21/test_artifact.py
+++ b/stix2/test/v21/test_artifact.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -35,6 +33,7 @@
     True,
 )
 
+
 def test_basic_artifact():
     store.sink.generate_stix_schema()
     artifact_stix_object = stix2.parse(basic_artifact_dict)
@@ -44,6 +43,7 @@ def test_basic_artifact():
     for attrib in basic_artifact_dict.keys():
         assert basic_artifact_dict[attrib] == read_obj[attrib]
 
+
 def test_encrypted_artifact():
     store.sink.generate_stix_schema()
     artifact_stix_object = stix2.parse(encrypted_artifact_dict)
@@ -51,6 +51,6 @@ def test_encrypted_artifact():
     read_obj = json.loads(store.get(artifact_stix_object['id']).serialize())
 
     for attrib in encrypted_artifact_dict.keys():
-        if attrib == 'hashes': # TODO hashes are saved to separate table, functionality to retrieve is WIP
+        if attrib == 'hashes':  # TODO hashes are saved to separate table, functionality to retrieve is WIP
             continue
-        assert encrypted_artifact_dict[attrib] == read_obj[attrib]
\ No newline at end of file
+        assert encrypted_artifact_dict[attrib] == read_obj[attrib]
diff --git a/stix2/test/v21/test_autonomous_system.py b/stix2/test/v21/test_autonomous_system.py
index 81399446..82fb4f10 100644
--- a/stix2/test/v21/test_autonomous_system.py
+++ b/stix2/test/v21/test_autonomous_system.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 
@@ -21,6 +19,7 @@
     True,
 )
 
+
 def test_autonomous_system():
     store.sink.generate_stix_schema()
     as_obj = stix2.parse(as_dict)
@@ -28,4 +27,4 @@ def test_autonomous_system():
     read_obj = json.loads(store.get(as_obj['id']).serialize())
 
     for attrib in as_dict.keys():
-        assert as_dict[attrib] == read_obj[attrib]
\ No newline at end of file
+        assert as_dict[attrib] == read_obj[attrib]
diff --git a/stix2/test/v21/test_directory.py b/stix2/test/v21/test_directory.py
index 5896f25d..2f413866 100644
--- a/stix2/test/v21/test_directory.py
+++ b/stix2/test/v21/test_directory.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 
@@ -26,6 +24,7 @@
     True,
 )
 
+
 def test_directory():
     store.sink.generate_stix_schema()
     directory_obj = stix2.parse(directory_dict)
@@ -33,10 +32,9 @@ def test_directory():
     read_obj = json.loads(store.get(directory_obj['id']).serialize())
 
     for attrib in directory_dict.keys():
-        if attrib == "contains_refs": # TODO remove skip once we can pull from table join
+        if attrib == "contains_refs":  # TODO remove skip once we can pull from table join
             continue
-        if attrib == "ctime" or attrib == "mtime": # convert both into stix2 date format for consistency
+        if attrib == "ctime" or attrib == "mtime":  # convert both into stix2 date format for consistency
             assert stix2.utils.parse_into_datetime(directory_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert directory_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_domain_name.py b/stix2/test/v21/test_domain_name.py
index 42c60ae2..93f30d54 100644
--- a/stix2/test/v21/test_domain_name.py
+++ b/stix2/test/v21/test_domain_name.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 
@@ -19,6 +17,7 @@
     True,
 )
 
+
 def test_autonomous_system():
     store.sink.generate_stix_schema()
     domain_name_obj = stix2.parse(domain_name_dict)
@@ -26,4 +25,4 @@ def test_autonomous_system():
     read_obj = json.loads(store.get(domain_name_obj['id']).serialize())
 
     for attrib in domain_name_dict.keys():
-        assert domain_name_dict[attrib] == read_obj[attrib]
\ No newline at end of file
+        assert domain_name_dict[attrib] == read_obj[attrib]
diff --git a/stix2/test/v21/test_email_address.py b/stix2/test/v21/test_email_address.py
index a0992979..6a00daef 100644
--- a/stix2/test/v21/test_email_address.py
+++ b/stix2/test/v21/test_email_address.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -22,6 +20,7 @@
     True,
 )
 
+
 def test_email_addr():
     store.sink.generate_stix_schema()
     email_addr_stix_object = stix2.parse(email_addr_dict)
diff --git a/stix2/test/v21/test_email_message.py b/stix2/test/v21/test_email_message.py
index 7fad0946..038b3274 100644
--- a/stix2/test/v21/test_email_message.py
+++ b/stix2/test/v21/test_email_message.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -63,19 +61,19 @@
     },
     "body_multipart": [
         {
-        "content_type": "text/plain; charset=utf-8",
-        "content_disposition": "inline",
-        "body": "Cats are funny!",
+            "content_type": "text/plain; charset=utf-8",
+            "content_disposition": "inline",
+            "body": "Cats are funny!",
         },
         {
-        "content_type": "image/png",
-        "content_disposition": "attachment; filename=\"tabby.png\"",
-        "body_raw_ref": "artifact--4cce66f8-6eaa-53cb-85d5-3a85fca3a6c5",
+            "content_type": "image/png",
+            "content_disposition": "attachment; filename=\"tabby.png\"",
+            "body_raw_ref": "artifact--4cce66f8-6eaa-53cb-85d5-3a85fca3a6c5",
         },
         {
-        "content_type": "application/zip",
-        "content_disposition": "attachment; filename=\"tabby_pics.zip\"",
-        "body_raw_ref": "file--6ce09d9c-0ad3-5ebf-900c-e3cb288955b5",
+            "content_type": "application/zip",
+            "content_disposition": "attachment; filename=\"tabby_pics.zip\"",
+            "body_raw_ref": "file--6ce09d9c-0ad3-5ebf-900c-e3cb288955b5",
         },
     ],
 }
@@ -87,6 +85,7 @@
     True,
 )
 
+
 def test_email_msg():
     store.sink.generate_stix_schema()
     email_msg_stix_object = stix2.parse(email_msg_dict)
@@ -95,13 +94,16 @@ def test_email_msg():
 
     for attrib in email_msg_dict.keys():
         if attrib == "to_refs" or attrib == "cc_refs" or attrib == "bcc_refs" \
-            or attrib == "additional_header_fields": # join multiple tables not implemented yet
+                or attrib == "additional_header_fields":  # join multiple tables not implemented yet
             continue
         if attrib == "date":
-            assert stix2.utils.parse_into_datetime(email_msg_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
+            assert stix2.utils.parse_into_datetime(email_msg_dict[attrib]) == stix2.utils.parse_into_datetime(
+                read_obj[attrib],
+            )
             continue
         assert email_msg_dict[attrib] == read_obj[attrib]
 
+
 def test_multipart_email_msg():
     store.sink.generate_stix_schema()
     multipart_email_msg_stix_object = stix2.parse(multipart_email_msg_dict)
@@ -110,10 +112,11 @@ def test_multipart_email_msg():
 
     for attrib in multipart_email_msg_dict.keys():
         if attrib == "to_refs" or attrib == "cc_refs" or attrib == "bcc_refs" \
-            or attrib == "additional_header_fields" or attrib == "body_multipart": # join multiple tables not implemented yet
+                or attrib == "additional_header_fields" or attrib == "body_multipart":  # join multiple tables not implemented yet
             continue
         if attrib == "date":
-            assert stix2.utils.parse_into_datetime(multipart_email_msg_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
+            assert stix2.utils.parse_into_datetime(multipart_email_msg_dict[attrib]) == stix2.utils.parse_into_datetime(
+                read_obj[attrib],
+            )
             continue
         assert multipart_email_msg_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_file.py b/stix2/test/v21/test_file.py
index 12c1d5ee..647f81e5 100644
--- a/stix2/test/v21/test_file.py
+++ b/stix2/test/v21/test_file.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -36,6 +34,7 @@
     True,
 )
 
+
 def test_file():
     store.sink.generate_stix_schema()
     file_stix_object = stix2.parse(file_dict)
@@ -44,10 +43,9 @@ def test_file():
     read_obj = json.loads(store.get(file_stix_object['id']).serialize())
 
     for attrib in file_dict.keys():
-        if attrib == "contains_refs" or attrib == "hashes": # join multiple tables not implemented yet
+        if attrib == "contains_refs" or attrib == "hashes":  # join multiple tables not implemented yet
             continue
         if attrib == "ctime" or attrib == "mtime" or attrib == "atime":
             assert stix2.utils.parse_into_datetime(file_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert file_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_ipv4_ipv6.py b/stix2/test/v21/test_ipv4_ipv6.py
index a3755b3b..c32197d4 100644
--- a/stix2/test/v21/test_ipv4_ipv6.py
+++ b/stix2/test/v21/test_ipv4_ipv6.py
@@ -1,7 +1,3 @@
-import json
-
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -27,6 +23,7 @@
     True,
 )
 
+
 def test_ipv4():
     store.sink.generate_stix_schema()
     ipv4_stix_object = stix2.parse(ipv4_dict)
@@ -45,4 +42,3 @@ def test_ipv6():
 
     for attrib in ipv6_dict.keys():
         assert ipv6_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_mutex.py b/stix2/test/v21/test_mutex.py
index e7df076b..55fdd5d2 100644
--- a/stix2/test/v21/test_mutex.py
+++ b/stix2/test/v21/test_mutex.py
@@ -1,7 +1,3 @@
-import json
-
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -20,6 +16,7 @@
     True,
 )
 
+
 def test_mutex():
     store.sink.generate_stix_schema()
     mutex_stix_object = stix2.parse(mutex_dict)
@@ -28,4 +25,3 @@ def test_mutex():
 
     for attrib in mutex_dict.keys():
         assert mutex_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_network_traffic.py b/stix2/test/v21/test_network_traffic.py
index f24e594f..ddb47a49 100644
--- a/stix2/test/v21/test_network_traffic.py
+++ b/stix2/test/v21/test_network_traffic.py
@@ -1,7 +1,3 @@
-import json
-
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -29,7 +25,7 @@
     "dst_packets": 100,
     "src_payload_ref": "artifact--3857f78d-7d16-5092-99fe-ecff58408b02",
     "dst_payload_ref": "artifact--3857f78d-7d16-5092-99fe-ecff58408b03",
-    "encapsulates_refs" : [
+    "encapsulates_refs": [
         "network-traffic--53e0bf48-2eee-5c03-8bde-ed7049d2c0a3",
         "network-traffic--53e0bf48-2eee-5c03-8bde-ed7049d2c0a4",
     ],
@@ -43,6 +39,7 @@
     True,
 )
 
+
 def test_network_traffic():
     store.sink.generate_stix_schema()
     network_traffic_stix_object = stix2.parse(network_traffic_dict)
@@ -50,12 +47,9 @@ def test_network_traffic():
     read_obj = store.get(network_traffic_stix_object['id'])
 
     for attrib in network_traffic_dict.keys():
-        if attrib == "encapsulates_refs": # multiple table join not implemented
+        if attrib == "encapsulates_refs":  # multiple table join not implemented
             continue
         if attrib == "start" or attrib == "end":
             assert stix2.utils.parse_into_datetime(network_traffic_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert network_traffic_dict[attrib] == read_obj[attrib]
-
-
-
diff --git a/stix2/test/v21/test_process.py b/stix2/test/v21/test_process.py
index c58f9c68..519fd2d1 100644
--- a/stix2/test/v21/test_process.py
+++ b/stix2/test/v21/test_process.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -37,6 +35,7 @@
     True,
 )
 
+
 def test_process():
     store.sink.generate_stix_schema()
     process_stix_object = stix2.parse(process_dict)
@@ -45,10 +44,10 @@ def test_process():
     read_obj = json.loads(store.get(process_stix_object['id']).serialize())
 
     for attrib in process_dict.keys():
-        if attrib == "child_refs" or attrib == "opened_connection_refs" or attrib == "environment_variables": # join multiple tables not implemented yet
+        if attrib == "child_refs" or attrib == "opened_connection_refs" or attrib == "environment_variables":
+            # join multiple tables not implemented yet
             continue
         if attrib == "created_time":
             assert stix2.utils.parse_into_datetime(process_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert process_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_software.py b/stix2/test/v21/test_software.py
index a2a201ac..896e9c2a 100644
--- a/stix2/test/v21/test_software.py
+++ b/stix2/test/v21/test_software.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -23,6 +21,7 @@
     True,
 )
 
+
 def test_software():
     store.sink.generate_stix_schema()
     software_stix_object = stix2.parse(software_dict)
@@ -32,4 +31,3 @@ def test_software():
 
     for attrib in software_dict.keys():
         assert software_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_url.py b/stix2/test/v21/test_url.py
index d3a331e1..838cbfbb 100644
--- a/stix2/test/v21/test_url.py
+++ b/stix2/test/v21/test_url.py
@@ -1,8 +1,5 @@
-import datetime as dt
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -10,7 +7,7 @@
 url_dict = {
     "type": "url",
     "id": "url--a5477287-23ac-5971-a010-5c287877fa60",
-    "value" : "https://example.com/research/index.html",
+    "value": "https://example.com/research/index.html",
 }
 
 store = RelationalDBStore(
@@ -20,6 +17,7 @@
         True,
 )
 
+
 def test_url():
     store.sink.generate_stix_schema()
     url_stix_object = stix2.parse(url_dict)
@@ -27,4 +25,4 @@ def test_url():
     read_obj = json.loads(store.get(url_stix_object['id']).serialize())
 
     for attrib in url_dict.keys():
-        assert url_dict[attrib] == read_obj[attrib]
\ No newline at end of file
+        assert url_dict[attrib] == read_obj[attrib]
diff --git a/stix2/test/v21/test_user_account.py b/stix2/test/v21/test_user_account.py
index 80c2fd14..374c2377 100644
--- a/stix2/test/v21/test_user_account.py
+++ b/stix2/test/v21/test_user_account.py
@@ -1,8 +1,5 @@
-import datetime as dt
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -28,12 +25,13 @@
 }
 
 store = RelationalDBStore(
-        "postgresql://postgres:admin@localhost/postgres",
-        False,
-        None,
-        True,
+    "postgresql://postgres:admin@localhost/postgres",
+    False,
+    None,
+    True,
 )
 
+
 def test_user_account():
     store.sink.generate_stix_schema()
     user_account_stix_object = stix2.parse(user_account_dict)
@@ -42,9 +40,10 @@ def test_user_account():
 
     for attrib in user_account_dict.keys():
         if attrib == "account_created" or attrib == "account_expires" \
-            or attrib == "credential_last_changed" or attrib == "account_first_login" \
+                or attrib == "credential_last_changed" or attrib == "account_first_login" \
                 or attrib == "account_last_login":
-                    assert stix2.utils.parse_into_datetime(user_account_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
-                    continue
+            assert stix2.utils.parse_into_datetime(user_account_dict[attrib]) == stix2.utils.parse_into_datetime(
+                read_obj[attrib],
+            )
+            continue
         assert user_account_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_windows_registry.py b/stix2/test/v21/test_windows_registry.py
index 582a1ced..f2864548 100644
--- a/stix2/test/v21/test_windows_registry.py
+++ b/stix2/test/v21/test_windows_registry.py
@@ -1,8 +1,5 @@
-import datetime as dt
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -14,14 +11,14 @@
     "key": "hkey_local_machine\\system\\bar\\foo",
     "values": [
         {
-        "name": "Foo",
-        "data": "qwerty",
-        "data_type": "REG_SZ",
+            "name": "Foo",
+            "data": "qwerty",
+            "data_type": "REG_SZ",
         },
         {
-        "name": "Bar",
-        "data": "42",
-        "data_type": "REG_DWORD",
+            "name": "Bar",
+            "data": "42",
+            "data_type": "REG_DWORD",
         },
     ],
     "modified_time": "2018-01-20T12:31:12Z",
@@ -30,12 +27,13 @@
 }
 
 store = RelationalDBStore(
-        "postgresql://postgres:admin@localhost/postgres",
-        False,
-        None,
-        True,
+    "postgresql://postgres:admin@localhost/postgres",
+    False,
+    None,
+    True,
 )
 
+
 def test_windows_registry():
     store.sink.generate_stix_schema()
     windows_registry_stix_object = stix2.parse(windows_registry_dict)
@@ -43,10 +41,11 @@ def test_windows_registry():
     read_obj = json.loads(store.get(windows_registry_stix_object['id']).serialize())
 
     for attrib in windows_registry_dict.keys():
-        if attrib == "values": # skip multiple table join
+        if attrib == "values":  # skip multiple table join
             continue
         if attrib == "modified_time":
-            assert stix2.utils.parse_into_datetime(windows_registry_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
+            assert stix2.utils.parse_into_datetime(windows_registry_dict[attrib]) == stix2.utils.parse_into_datetime(
+                read_obj[attrib],
+            )
             continue
         assert windows_registry_dict[attrib] == read_obj[attrib]
-
diff --git a/stix2/test/v21/test_x509_certificates.py b/stix2/test/v21/test_x509_certificates.py
index d3ec5b7f..1847dbc2 100644
--- a/stix2/test/v21/test_x509_certificates.py
+++ b/stix2/test/v21/test_x509_certificates.py
@@ -1,7 +1,5 @@
 import json
 
-import pytest
-
 import stix2
 from stix2.datastore.relational_db.relational_db import RelationalDBStore
 import stix2.properties
@@ -20,41 +18,42 @@
 }
 
 extensions_x509_certificate_dict = {
-    "type":"x509-certificate",
+    "type": "x509-certificate",
     "spec_version": "2.1",
     "id": "x509-certificate--b595eaf0-0b28-5dad-9e8e-0fab9c1facc9",
-    "issuer":"C=ZA, ST=Western Cape, L=Cape Town, O=Thawte Consulting cc, OU=Certification \
+    "issuer": "C=ZA, ST=Western Cape, L=Cape Town, O=Thawte Consulting cc, OU=Certification \
     Services Division, CN=Thawte Server CA/emailAddress=server-certs@thawte.com",
-    "validity_not_before":"2016-03-12T12:00:00Z",
-    "validity_not_after":"2016-08-21T12:00:00Z",
-    "subject":"C=US, ST=Maryland, L=Pasadena, O=Brent Baccala, OU=FreeSoft, \
+    "validity_not_before": "2016-03-12T12:00:00Z",
+    "validity_not_after": "2016-08-21T12:00:00Z",
+    "subject": "C=US, ST=Maryland, L=Pasadena, O=Brent Baccala, OU=FreeSoft, \
     CN=www.freesoft.org/emailAddress=baccala@freesoft.org",
     "serial_number": "02:08:87:83:f2:13:58:1f:79:52:1e:66:90:0a:02:24:c9:6b:c7:dc",
-    "x509_v3_extensions":{
-        "basic_constraints":"critical,CA:TRUE, pathlen:0",
-        "name_constraints":"permitted;IP:192.168.0.0/255.255.0.0",
-        "policy_constraints":"requireExplicitPolicy:3",
-        "key_usage":"critical, keyCertSign",
-        "extended_key_usage":"critical,codeSigning,1.2.3.4",
-        "subject_key_identifier":"hash",
-        "authority_key_identifier":"keyid,issuer",
-        "subject_alternative_name":"email:my@other.address,RID:1.2.3.4",
-        "issuer_alternative_name":"issuer:copy",
-        "crl_distribution_points":"URI:http://myhost.com/myca.crl",
-        "inhibit_any_policy":"2",
-        "private_key_usage_period_not_before":"2016-03-12T12:00:00Z",
-        "private_key_usage_period_not_after":"2018-03-12T12:00:00Z",
-        "certificate_policies":"1.2.4.5, 1.1.3.4",
+    "x509_v3_extensions": {
+        "basic_constraints": "critical,CA:TRUE, pathlen:0",
+        "name_constraints": "permitted;IP:192.168.0.0/255.255.0.0",
+        "policy_constraints": "requireExplicitPolicy:3",
+        "key_usage": "critical, keyCertSign",
+        "extended_key_usage": "critical,codeSigning,1.2.3.4",
+        "subject_key_identifier": "hash",
+        "authority_key_identifier": "keyid,issuer",
+        "subject_alternative_name": "email:my@other.address,RID:1.2.3.4",
+        "issuer_alternative_name": "issuer:copy",
+        "crl_distribution_points": "URI:http://myhost.com/myca.crl",
+        "inhibit_any_policy": "2",
+        "private_key_usage_period_not_before": "2016-03-12T12:00:00Z",
+        "private_key_usage_period_not_after": "2018-03-12T12:00:00Z",
+        "certificate_policies": "1.2.4.5, 1.1.3.4",
     },
 }
 
 store = RelationalDBStore(
-        "postgresql://postgres:admin@localhost/postgres",
-        False,
-        None,
-        True,
+    "postgresql://postgres:admin@localhost/postgres",
+    False,
+    None,
+    True,
 )
 
+
 def test_basic_x509_certificate():
     store.sink.generate_stix_schema()
     basic_x509_certificate_stix_object = stix2.parse(basic_x509_certificate_dict)
@@ -63,10 +62,13 @@ def test_basic_x509_certificate():
 
     for attrib in basic_x509_certificate_dict.keys():
         if attrib == "validity_not_before" or attrib == "validity_not_after":
-            assert stix2.utils.parse_into_datetime(basic_x509_certificate_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
+            assert stix2.utils.parse_into_datetime(
+                basic_x509_certificate_dict[attrib],
+            ) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert basic_x509_certificate_dict[attrib] == read_obj[attrib]
 
+
 def test_x509_certificate_with_extensions():
     store.sink.generate_stix_schema()
     extensions_x509_certificate_stix_object = stix2.parse(extensions_x509_certificate_dict)
@@ -74,11 +76,11 @@ def test_x509_certificate_with_extensions():
     read_obj = json.loads(store.get(extensions_x509_certificate_stix_object['id']).serialize())
 
     for attrib in extensions_x509_certificate_dict.keys():
-        if attrib == "x509_v3_extensions": # skipping multi-table join
+        if attrib == "x509_v3_extensions":  # skipping multi-table join
             continue
         if attrib == "validity_not_before" or attrib == "validity_not_after":
-            assert stix2.utils.parse_into_datetime(extensions_x509_certificate_dict[attrib]) == stix2.utils.parse_into_datetime(read_obj[attrib])
+            assert stix2.utils.parse_into_datetime(
+                extensions_x509_certificate_dict[attrib],
+            ) == stix2.utils.parse_into_datetime(read_obj[attrib])
             continue
         assert extensions_x509_certificate_dict[attrib] == read_obj[attrib]
-
-