diff --git a/tests/base_api_tests.py b/tests/base_api_tests.py
index 5364b53d2f1e0..7a0481301a304 100644
--- a/tests/base_api_tests.py
+++ b/tests/base_api_tests.py
@@ -20,6 +20,7 @@
 from flask_appbuilder.models.sqla.interface import SQLAInterface
 import prison
 
+import tests.test_app
 from superset import db, security_manager
 from superset.extensions import appbuilder
 from superset.models.dashboard import Dashboard
diff --git a/tests/dashboard_api_tests.py b/tests/dashboard_api_tests.py
index 2f72b2ea9af7e..af16e5fbdeabc 100644
--- a/tests/dashboard_api_tests.py
+++ b/tests/dashboard_api_tests.py
@@ -14,12 +14,14 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Superset"""
 import json
 from typing import List
 
 import prison
 
+import tests.test_app
 from superset import db, security_manager
 from superset.models import core as models
 from superset.models.slice import Slice
diff --git a/tests/dashboard_tests.py b/tests/dashboard_tests.py
index 9ee6a32109cff..c4a7f49421216 100644
--- a/tests/dashboard_tests.py
+++ b/tests/dashboard_tests.py
@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Superset"""
 import json
 import unittest
@@ -22,6 +23,7 @@
 from flask import escape
 from sqlalchemy import func
 
+import tests.test_app
 from superset import db, security_manager
 from superset.connectors.sqla.models import SqlaTable
 from superset.models import core as models
diff --git a/tests/database_api_tests.py b/tests/database_api_tests.py
index 7baeb6ca3e7c5..adfc43f6447a9 100644
--- a/tests/database_api_tests.py
+++ b/tests/database_api_tests.py
@@ -14,11 +14,13 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Superset"""
 import json
 
 import prison
 
+import tests.test_app
 from superset import db
 from superset.models.core import Database
 from superset.utils.core import get_example_database
diff --git a/tests/dataframe_test.py b/tests/dataframe_test.py
index 71aff104780c6..fdb0207bba8cd 100644
--- a/tests/dataframe_test.py
+++ b/tests/dataframe_test.py
@@ -14,9 +14,11 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import numpy as np
 import pandas as pd
 
+import tests.test_app
 from superset.dataframe import df_to_records
 from superset.db_engine_specs import BaseEngineSpec
 from superset.result_set import SupersetResultSet
diff --git a/tests/druid_func_tests.py b/tests/druid_func_tests.py
index c1ac6a908210b..1ed7057bc7918 100644
--- a/tests/druid_func_tests.py
+++ b/tests/druid_func_tests.py
@@ -14,10 +14,12 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import json
 import unittest
 from unittest.mock import Mock
 
+import tests.test_app
 import superset.connectors.druid.models as models
 from superset.connectors.druid.models import DruidColumn, DruidDatasource, DruidMetric
 from superset.exceptions import SupersetException
diff --git a/tests/log_api_tests.py b/tests/log_api_tests.py
index 86ee1732f5f8b..dbf1084c1fd57 100644
--- a/tests/log_api_tests.py
+++ b/tests/log_api_tests.py
@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Superset"""
 import json
 from typing import Optional
@@ -21,6 +22,7 @@
 import prison
 from flask_appbuilder.security.sqla.models import User
 
+import tests.test_app
 from superset import db
 from superset.models.core import Log
 
diff --git a/tests/model_tests.py b/tests/model_tests.py
index 24a87b6e594d5..6c93ed807fe30 100644
--- a/tests/model_tests.py
+++ b/tests/model_tests.py
@@ -14,12 +14,14 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import textwrap
 import unittest
 
 import pandas
 from sqlalchemy.engine.url import make_url
 
+import tests.test_app
 from superset import app
 from superset.models.core import Database
 from superset.utils.core import get_example_database, QueryStatus
diff --git a/tests/result_set_tests.py b/tests/result_set_tests.py
index 6e7df13b69ce4..1f697cc814d58 100644
--- a/tests/result_set_tests.py
+++ b/tests/result_set_tests.py
@@ -14,11 +14,13 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 from datetime import datetime
 
 import numpy as np
 import pandas as pd
 
+import tests.test_app
 from superset.dataframe import df_to_records
 from superset.db_engine_specs import BaseEngineSpec
 from superset.result_set import dedup, SupersetResultSet
diff --git a/tests/security_tests.py b/tests/security_tests.py
index 864d28eacf36e..a0718fd1e7602 100644
--- a/tests/security_tests.py
+++ b/tests/security_tests.py
@@ -14,12 +14,14 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import inspect
 import unittest
 from unittest.mock import Mock, patch
 
 import prison
 
+import tests.test_app
 from superset import app, appbuilder, db, security_manager, viz
 from superset.connectors.druid.models import DruidCluster, DruidDatasource
 from superset.connectors.sqla.models import SqlaTable
diff --git a/tests/sql_validator_tests.py b/tests/sql_validator_tests.py
index 553e799039fa8..4cf2956bae748 100644
--- a/tests/sql_validator_tests.py
+++ b/tests/sql_validator_tests.py
@@ -14,12 +14,14 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Sql Lab"""
 import unittest
 from unittest.mock import MagicMock, patch
 
 from pyhive.exc import DatabaseError
 
+import tests.test_app
 from superset import app
 from superset.sql_validators import SQLValidationAnnotation
 from superset.sql_validators.base import BaseSQLValidator
diff --git a/tests/sqla_models_tests.py b/tests/sqla_models_tests.py
index b927ce8402742..e959989b33d9d 100644
--- a/tests/sqla_models_tests.py
+++ b/tests/sqla_models_tests.py
@@ -14,6 +14,8 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
+import tests.test_app
 from superset.connectors.sqla.models import SqlaTable, TableColumn
 from superset.db_engine_specs.druid import DruidEngineSpec
 from superset.utils.core import get_example_database
diff --git a/tests/sqllab_tests.py b/tests/sqllab_tests.py
index be452c558781a..27be7f157832c 100644
--- a/tests/sqllab_tests.py
+++ b/tests/sqllab_tests.py
@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Sql Lab"""
 import json
 from datetime import datetime, timedelta
@@ -21,6 +22,7 @@
 
 import prison
 
+import tests.test_app
 from superset import db, security_manager
 from superset.connectors.sqla.models import SqlaTable
 from superset.dataframe import df_to_records
diff --git a/tests/strategy_tests.py b/tests/strategy_tests.py
index 31a6bdfb3c6e7..e39a2bc32dfaa 100644
--- a/tests/strategy_tests.py
+++ b/tests/strategy_tests.py
@@ -14,10 +14,12 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 """Unit tests for Superset cache warmup"""
 import json
 from unittest.mock import MagicMock
 
+import tests.test_app
 from superset import db
 from superset.models.core import Log
 from superset.models.tags import get_tag, ObjectTypes, TaggedObject, TagTypes
diff --git a/tests/utils_tests.py b/tests/utils_tests.py
index 67363ac6a4790..81cc37cbd2013 100644
--- a/tests/utils_tests.py
+++ b/tests/utils_tests.py
@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import unittest
 import uuid
 from datetime import date, datetime, time, timedelta
@@ -25,6 +26,7 @@
 from flask_caching import Cache
 from sqlalchemy.exc import ArgumentError
 
+import tests.test_app
 from superset import app, db, security_manager
 from superset.exceptions import SupersetException
 from superset.models.core import Database
diff --git a/tests/viz_tests.py b/tests/viz_tests.py
index b9edb5670e491..2b1752daa6fae 100644
--- a/tests/viz_tests.py
+++ b/tests/viz_tests.py
@@ -14,6 +14,7 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
+# isort:skip_file
 import uuid
 from datetime import datetime
 from math import nan
@@ -22,6 +23,7 @@
 import numpy as np
 import pandas as pd
 
+import tests.test_app
 import superset.viz as viz
 from superset import app
 from superset.constants import NULL_STRING
diff --git a/tox.ini b/tox.ini
index 8da0d30306148..ad46503b5391a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,7 +19,7 @@ commands =
     {toxinidir}/superset/bin/superset db upgrade
     {toxinidir}/superset/bin/superset init
     nosetests tests/load_examples_test.py
-    nosetests -e load_examples_test tests {posargs}
+    nosetests --exclude=load_examples_test {posargs:tests}
 deps =
     -rrequirements.txt
     -rrequirements-dev.txt