chore: convert feature flag tests to unit tests (#17689)

* chore: convert feature flag tests to unit tests

* Fix test

tests/unit_tests/feature_flag_test.py

@@ -0,0 +1,65 @@
+# 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.
+from pytest_mock import MockFixture
+
+from superset import is_feature_enabled
+
+
+def dummy_is_feature_enabled(feature_flag_name: str, default: bool = True) -> bool:
+    return True if feature_flag_name.startswith("True_") else default
+
+
+def test_existing_feature_flags(mocker: MockFixture) -> None:
+    """
+    Test that ``is_feature_enabled`` reads flags correctly.
+    """
+    mocker.patch.dict(
+        "superset.extensions.feature_flag_manager._feature_flags",
+        {"FOO": True},
+        clear=True,
+    )
+    assert is_feature_enabled("FOO") is True
+
+
+def test_nonexistent_feature_flags(mocker: MockFixture) -> None:
+    """
+    Test that ``is_feature_enabled`` returns ``False`` when flag not set.
+    """
+    mocker.patch.dict(
+        "superset.extensions.feature_flag_manager._feature_flags", {}, clear=True
+    )
+    assert is_feature_enabled("FOO") is False
+
+
+def test_is_feature_enabled(mocker: MockFixture) -> None:
+    """
+    Test ``_is_feature_enabled_func``.
+    """
+    mocker.patch.dict(
+        "superset.extensions.feature_flag_manager._feature_flags",
+        {"True_Flag1": False, "True_Flag2": True, "Flag3": False, "Flag4": True},
+        clear=True,
+    )
+    mocker.patch(
+        "superset.extensions.feature_flag_manager._is_feature_enabled_func",
+        dummy_is_feature_enabled,
+    )
+
+    assert is_feature_enabled("True_Flag1") is True
+    assert is_feature_enabled("True_Flag2") is True
+    assert is_feature_enabled("Flag3") is False
+    assert is_feature_enabled("Flag4") is True