yardz commented on a change in pull request #13656:
URL: https://github.com/apache/superset/pull/13656#discussion_r602332393



##########
File path: 
superset-frontend/src/explore/components/controls/CollectionControl/CollectionControl.test.tsx
##########
@@ -0,0 +1,171 @@
+/**
+ * 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 userEvent from '@testing-library/user-event';
+import React from 'react';
+import { render, screen } from 'spec/helpers/testing-library';
+import CollectionControl from '.';
+
+jest.mock('@superset-ui/chart-controls', () => ({
+  InfoTooltipWithTrigger: (props: any) => (
+    <button
+      onClick={props.onClick}
+      type="button"
+      data-icon={props.icon}
+      data-tooltip={props.tooltip}
+    >
+      {props.label}
+    </button>
+  ),
+}));
+
+jest.mock('..', () => ({
+  __esModule: true,
+  default: {
+    TestControl: (props: any) => (
+      <button
+        type="button"
+        onClick={() => props.onChange(0, 'update')}
+        data-test="TestControl"
+      >
+        TestControl
+      </button>
+    ),
+  },
+}));
+
+let defaultProps = {
+  actions: {
+    addDangerToast: jest.fn(),
+    addInfoToast: jest.fn(),
+    addSuccessToast: jest.fn(),
+    addWarningToast: jest.fn(),
+    createNewSlice: jest.fn(),
+    fetchDatasourcesStarted: jest.fn(),
+    fetchDatasourcesSucceeded: jest.fn(),
+    fetchFaveStar: jest.fn(),
+    saveFaveStar: jest.fn(),
+    setControlValue: jest.fn(),
+    setDatasource: jest.fn(),
+    setDatasourceType: jest.fn(),
+    setDatasources: jest.fn(),
+    setExploreControls: jest.fn(),
+    sliceUpdated: jest.fn(),
+    toggleFaveStar: jest.fn(),
+    updateChartTitle: jest.fn(),
+  },
+  addTooltip: 'Add an item',
+  controlName: 'TestControl',
+  description: null,
+  hovered: false,
+  itemGenerator: jest.fn(),
+  keyAccessor: jest.fn(),
+  label: 'Time series columns',
+  name: 'column_collection',
+  onChange: jest.fn(),
+  placeholder: 'Empty collection',
+  type: 'CollectionControl',
+  validationErrors: [],
+  validators: [jest.fn()],
+  value: [{ key: 'hrYAZ5iBH' }],
+};
+
+beforeEach(() => {
+  defaultProps = {
+    actions: {
+      addDangerToast: jest.fn(),
+      addInfoToast: jest.fn(),
+      addSuccessToast: jest.fn(),
+      addWarningToast: jest.fn(),
+      createNewSlice: jest.fn(),
+      fetchDatasourcesStarted: jest.fn(),
+      fetchDatasourcesSucceeded: jest.fn(),
+      fetchFaveStar: jest.fn(),
+      saveFaveStar: jest.fn(),
+      setControlValue: jest.fn(),
+      setDatasource: jest.fn(),
+      setDatasourceType: jest.fn(),
+      setDatasources: jest.fn(),
+      setExploreControls: jest.fn(),
+      sliceUpdated: jest.fn(),
+      toggleFaveStar: jest.fn(),
+      updateChartTitle: jest.fn(),
+    },
+    addTooltip: 'Add an item',
+    controlName: 'TestControl',
+    description: null,
+    hovered: false,
+    itemGenerator: jest.fn(),
+    keyAccessor: jest.fn(),
+    label: 'Time series columns',
+    name: 'column_collection',
+    onChange: jest.fn(),
+    placeholder: 'Empty collection',
+    type: 'CollectionControl',
+    validationErrors: [],
+    validators: [jest.fn()],
+    value: [{ key: 'hrYAZ5iBH' }],
+  };
+});
+
+test('Should render', () => {
+  render(<CollectionControl {...defaultProps} />);
+  expect(screen.getByTestId('CollectionControl')).toBeInTheDocument();

Review comment:
       @rusackas It was not in this specific case. But in the past I've had 
problems that `container` had a very different result than `screen`. As 
`screen` is theoretically the HTML that will be rendered in the browser, I 
prefer to use it. Any change in behavior or configuration will not change the 
test result. That way I'm **sure** the test is right.
   
   I only use `container` when I'm doing unit tests, and even in these cases I 
avoid it as much as possible.




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