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/superset_test_config_thumbnails.py

@@ -0,0 +1,88 @@
+# 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.
+# type: ignore
+from copy import copy
+
+from superset.config import *
+
+AUTH_USER_REGISTRATION_ROLE = "alpha"
+SQLALCHEMY_DATABASE_URI = "sqlite:///" + os.path.join(
+    DATA_DIR, "unittests.integration_tests.db"
+)
+DEBUG = True
+SUPERSET_WEBSERVER_PORT = 8081
+
+# Allowing SQLALCHEMY_DATABASE_URI to be defined as an env var for
+# continuous integration
+if "SUPERSET__SQLALCHEMY_DATABASE_URI" in os.environ:
+    SQLALCHEMY_DATABASE_URI = os.environ["SUPERSET__SQLALCHEMY_DATABASE_URI"]
+
+if "sqlite" in SQLALCHEMY_DATABASE_URI:
+    logger.warning(
+        "SQLite Database support for metadata databases will be removed \
+        in a future version of Superset."
+    )
+
+SQL_SELECT_AS_CTA = True
+SQL_MAX_ROW = 666
+
+
+def GET_FEATURE_FLAGS_FUNC(ff):
+    ff_copy = copy(ff)
+    ff_copy["super"] = "set"
+    return ff_copy
+
+
+TESTING = True
+WTF_CSRF_ENABLED = False
+PUBLIC_ROLE_LIKE = "Gamma"
+AUTH_ROLE_PUBLIC = "Public"
+EMAIL_NOTIFICATIONS = False
+
+CACHE_CONFIG = {"CACHE_TYPE": "simple"}
+
+REDIS_HOST = os.environ.get("REDIS_HOST", "localhost")
+REDIS_PORT = os.environ.get("REDIS_PORT", "6379")
+REDIS_CELERY_DB = os.environ.get("REDIS_CELERY_DB", 2)
+REDIS_RESULTS_DB = os.environ.get("REDIS_RESULTS_DB", 3)
+
+
+class CeleryConfig(object):
+    BROKER_URL = f"redis://{REDIS_HOST}:{REDIS_PORT}/{REDIS_CELERY_DB}"
+    CELERY_IMPORTS = ("superset.sql_lab", "superset.tasks.thumbnails")
+    CELERY_ANNOTATIONS = {"sql_lab.add": {"rate_limit": "10/s"}}
+    CONCURRENCY = 1
+
+
+CELERY_CONFIG = CeleryConfig
+
+FEATURE_FLAGS = {
+    "foo": "bar",
+    "KV_STORE": False,
+    "SHARE_QUERIES_VIA_KV_STORE": False,
+    "THUMBNAILS": True,
+    "THUMBNAILS_SQLA_LISTENERS": False,
+}
+
+THUMBNAIL_CACHE_CONFIG = {
+    "CACHE_TYPE": "redis",
+    "CACHE_DEFAULT_TIMEOUT": 10000,
+    "CACHE_KEY_PREFIX": "superset_thumbnails_",
+    "CACHE_REDIS_HOST": REDIS_HOST,
+    "CACHE_REDIS_PORT": REDIS_PORT,
+    "CACHE_REDIS_DB": REDIS_CELERY_DB,
+}