Cleanup (#1909)

packages/code-studio/src/styleguide/StyleGuide.test.tsx

@@ -9,41 +9,36 @@ import StyleGuide from './StyleGuide';
 window.HTMLElement.prototype.scroll = jest.fn();
 window.HTMLElement.prototype.scrollIntoView = jest.fn();
 
-/*
- * React Spectrum `useVirtualizerItem` depends on `scrollWidth` and `scrollHeight`.
- * Mocking these to avoid React "Maximum update depth exceeded" errors.
- * https://github.com/adobe/react-spectrum/blob/0b2a838b36ad6d86eee13abaf68b7e4d2b4ada6c/packages/%40react-aria/virtualizer/src/useVirtualizerItem.ts#L49C3-L49C60
+/**
+ * Mock a dimension property of a ListView element.
  */
-function mockListViewDimension(value: number) {
-  return function getDimension() {
-    const isSpectrumListView =
-      this instanceof HTMLElement &&
-      this.className.includes('_react-spectrum-ListView');
+function mockListViewDimension(propName: keyof HTMLElement, value: number) {
+  jest
+    .spyOn(window.HTMLElement.prototype, propName, 'get')
+    .mockImplementation(function getDimension() {
+      const isSpectrumListView =
+        this instanceof HTMLElement &&
+        this.className.includes('_react-spectrum-ListView');
 
-    // For non ListView, just return zero which is the default value anyway.
-    return isSpectrumListView === true ? value : 0;
-  };
+      // For non ListView, just return zero which is the default value anyway.
+      return isSpectrumListView === true ? value : 0;
+    });
 }
 
 describe('<StyleGuide /> mounts', () => {
   test('h1 text of StyleGuide renders', () => {
     // Provide a non-null array to ThemeProvider to tell it to initialize
     const customThemes: ThemeData[] = [];
 
+    // React Spectrum `useVirtualizerItem` depends on `scrollWidth` and `scrollHeight`.
+    // Mocking these to avoid React "Maximum update depth exceeded" errors.
+    // https://github.com/adobe/react-spectrum/blob/0b2a838b36ad6d86eee13abaf68b7e4d2b4ada6c/packages/%40react-aria/virtualizer/src/useVirtualizerItem.ts#L49C3-L49C60
     // From preview docs: https://reactspectrum.blob.core.windows.net/reactspectrum/726a5e8f0ed50fc8d98e39c74bd6dfeb3660fbdf/docs/react-spectrum/testing.html#virtualized-components
     // The virtualizer will now think it has a visible area of 1000px x 1000px and that the items within it are 40px x 40px
-    jest
-      .spyOn(window.HTMLElement.prototype, 'clientWidth', 'get')
-      .mockImplementation(mockListViewDimension(1000));
-    jest
-      .spyOn(window.HTMLElement.prototype, 'clientHeight', 'get')
-      .mockImplementation(mockListViewDimension(1000));
-    jest
-      .spyOn(window.HTMLElement.prototype, 'scrollHeight', 'get')
-      .mockImplementation(mockListViewDimension(40));
-    jest
-      .spyOn(window.HTMLElement.prototype, 'scrollWidth', 'get')
-      .mockImplementation(mockListViewDimension(40));
+    mockListViewDimension('clientWidth', 1000);
+    mockListViewDimension('clientHeight', 1000);
+    mockListViewDimension('scrollHeight', 40);
+    mockListViewDimension('scrollWidth', 40);
 
     expect(() =>
       render(