chore: Register dynamic plugins and add feature checks (#14650)

* chore: Register dynamic plugins and add feature checks

* Disable pylint warning

tests/dynamic_plugins_tests.py

@@ -0,0 +1,40 @@
+# 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 .base_tests import SupersetTestCase
+from .conftest import with_feature_flags
+
+
+class TestDynamicPlugins(SupersetTestCase):
+    @with_feature_flags(DYNAMIC_PLUGINS=False)
+    def test_dynamic_plugins_disabled(self):
+        """
+        Dynamic Plugins: Responds not found when disabled
+        """
+        self.login(username="admin")
+        uri = "/dynamic-plugins/api"
+        rv = self.client.get(uri)
+        self.assertEqual(rv.status_code, 404)
+
+    @with_feature_flags(DYNAMIC_PLUGINS=True)
+    def test_dynamic_plugins_enabled(self):
+        """
+        Dynamic Plugins: Responds successfully when enabled
+        """
+        self.login(username="admin")
+        uri = "/dynamic-plugins/api"
+        rv = self.client.get(uri)
+        self.assertEqual(rv.status_code, 200)