Add basic test case for debounce

tests/utils/decorators_tests.py

@@ -0,0 +1,43 @@
+# 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 unittest.mock import Mock
+
+from superset.utils import decorators
+from tests.base_tests import SupersetTestCase
+
+
+class UtilsDecoratorsTests(SupersetTestCase):
+    def test_debounce(self):
+        mock = Mock()
+
+        @decorators.debounce()
+        def myfunc(arg1: int, arg2: int, kwarg1: str = "abc", kwarg2: int = 2):
+            mock(arg1, kwarg1)
+            return arg1 + arg2 + kwarg2
+
+        # should be called only once when arguments don't change
+        myfunc(1, 1)
+        myfunc(1, 1)
+        result = myfunc(1, 1)
+        mock.assert_called_once_with(1, "abc")
+        self.assertEqual(result, 4)
+
+        # kwarg order shouldn't matter
+        myfunc(1, 0, kwarg2=2, kwarg1="haha")
+        result = myfunc(1, 0, kwarg1="haha", kwarg2=2)
+        mock.assert_has_calls([call(1, "abc"), call(1, "haha")])
+        self.assertEqual(result, 3)