refactor(tests): decouple unittests from integration tests (#15473)

* refactor move all tests to be under integration_tests package

* refactor decouple unittests from integration tests - commands

* add unit_tests package

* fix celery_tests.py

* fix wrong FIXTURES_DIR value

tests/integration_tests/security/api_tests.py

@@ -0,0 +1,57 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# isort:skip_file
+# pylint: disable=too-many-public-methods, no-self-use, invalid-name, too-many-arguments
+"""Unit tests for Superset"""
+import json
+
+from tests.integration_tests.base_tests import SupersetTestCase
+from flask_wtf.csrf import generate_csrf
+
+
+class TestSecurityApi(SupersetTestCase):
+    resource_name = "security"
+
+    def _assert_get_csrf_token(self):
+        uri = f"api/v1/{self.resource_name}/csrf_token/"
+        response = self.client.get(uri)
+        assert response.status_code == 200
+        data = json.loads(response.data.decode("utf-8"))
+        assert data["result"] == generate_csrf()
+
+    def test_get_csrf_token(self):
+        """
+        Security API: Test get CSRF token
+        """
+        self.login(username="admin")
+        self._assert_get_csrf_token()
+
+    def test_get_csrf_token_gamma(self):
+        """
+        Security API: Test get CSRF token by gamma
+        """
+        self.login(username="gamma")
+        self._assert_get_csrf_token()
+
+    def test_get_csrf_unauthorized(self):
+        """
+        Security API: Test get CSRF no login
+        """
+        self.logout()
+        uri = f"api/v1/{self.resource_name}/csrf_token/"
+        response = self.client.get(uri)
+        self.assertEqual(response.status_code, 401)