test: RTL overhaul - hackathon (#16626)

* CachedLabel_spec fully converted to RTL

* ColumnTypeLabel_spec fully converted to RTL

* MissingChart_spec fully converted to RTL

* RefreshIntervalModal_spec mostly converted to RTL

* HoverMenu_spec mostly converted to RTL

* ResizableContainer_spec fully converted to RTL

* ResizableHandle_spec fully converted to RTL

* AggregateOption_spec fully converted to RTL

* CheckboxControl_spec fully converted to RTL

* ColorPickerControl_spec to RTL

* Finished converting ColorPickerControl_spec to RTL/TS, also converted RefreshIntervalModal_spec to TS

* Added unknown type to ColumnTypeLabelProps

* Fixed ColumnTypeLabel_spec

superset-frontend/spec/javascripts/dashboard/components/menu/HoverMenu_spec.tsx

@@ -0,0 +1,30 @@
+/**
+ * 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 } from 'spec/helpers/testing-library';
+
+import HoverMenu from 'src/dashboard/components/menu/HoverMenu';
+
+describe('HoverMenu', () => {
+  it('should render a hover menu', () => {
+    const rendered = render(<HoverMenu />);
+    const hoverMenu = rendered.container.querySelector('.hover-menu');
+    expect(hoverMenu).toBeVisible();
+  });
+});