michael-s-molina commented on a change in pull request #13753:
URL: https://github.com/apache/superset/pull/13753#discussion_r600825539



##########
File path: 
superset-frontend/src/explore/components/controls/FilterBoxItemControl/FilterBoxItemControl.test.tsx
##########
@@ -0,0 +1,78 @@
+/**
+ * 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 React from 'react';
+import { render, screen } from 'spec/helpers/testing-library';
+import userEvent from '@testing-library/user-event';
+import FilterBoxItemControl from '.';
+
+const datasource = {
+  columns: [],
+  metrics: [],
+};
+
+let props = {

Review comment:
       I think we have some options to improve the readability, especially when 
the default props are big trees of values:
   - For the tests where we have plain object props the spread operator 
`{...props}` is already guaranteeing immutability. In this case, we can define 
the default props as a `const` and override them in each test.
   - For more complex structures we could use Lodash `cloneDeep` and follow the 
same pattern.
   - If we want to use `beforeEach`, and assert that the default props have the 
correct type, we can do something like:
   
   ```
   const newDefaultProps = () => ({
     name: 'John',
     lastname: 'Doe',
     age: 10,
   });
   
   let defaultProps: ReturnType<typeof newDefaultProps>;
   
   beforeEach(() => {
     defaultProps = newDefaultProps();
   });
   ```




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