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/db_engine_specs/snowflake_tests.py

@@ -0,0 +1,85 @@
+# 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.
+import json
+
+from superset.db_engine_specs.snowflake import SnowflakeEngineSpec
+from superset.errors import ErrorLevel, SupersetError, SupersetErrorType
+from superset.models.core import Database
+from tests.integration_tests.db_engine_specs.base_tests import TestDbEngineSpec
+
+
+class TestSnowflakeDbEngineSpec(TestDbEngineSpec):
+    def test_convert_dttm(self):
+        dttm = self.get_dttm()
+
+        test_cases = {
+            "DATE": "TO_DATE('2019-01-02')",
+            "DATETIME": "CAST('2019-01-02T03:04:05.678900' AS DATETIME)",
+            "TIMESTAMP": "TO_TIMESTAMP('2019-01-02T03:04:05.678900')",
+        }
+
+        for type_, expected in test_cases.items():
+            self.assertEqual(SnowflakeEngineSpec.convert_dttm(type_, dttm), expected)
+
+    def test_database_connection_test_mutator(self):
+        database = Database(sqlalchemy_uri="snowflake://abc")
+        SnowflakeEngineSpec.mutate_db_for_connection_test(database)
+        engine_params = json.loads(database.extra or "{}")
+
+        self.assertDictEqual(
+            {"engine_params": {"connect_args": {"validate_default_parameters": True}}},
+            engine_params,
+        )
+
+    def test_extract_errors(self):
+        msg = "Object dumbBrick does not exist or not authorized."
+        result = SnowflakeEngineSpec.extract_errors(Exception(msg))
+        assert result == [
+            SupersetError(
+                message="dumbBrick does not exist in this database.",
+                error_type=SupersetErrorType.OBJECT_DOES_NOT_EXIST_ERROR,
+                level=ErrorLevel.ERROR,
+                extra={
+                    "engine_name": "Snowflake",
+                    "issue_codes": [
+                        {
+                            "code": 1029,
+                            "message": "Issue 1029 - The object does not exist in the given database.",
+                        }
+                    ],
+                },
+            )
+        ]
+
+        msg = "syntax error line 1 at position 10 unexpected 'limmmited'."
+        result = SnowflakeEngineSpec.extract_errors(Exception(msg))
+        assert result == [
+            SupersetError(
+                message='Please check your query for syntax errors at or near "limmmited". Then, try running your query again.',
+                error_type=SupersetErrorType.SYNTAX_ERROR,
+                level=ErrorLevel.ERROR,
+                extra={
+                    "engine_name": "Snowflake",
+                    "issue_codes": [
+                        {
+                            "code": 1030,
+                            "message": "Issue 1030 - The query has a syntax error.",
+                        }
+                    ],
+                },
+            )
+        ]