Updated test case file

Author: prakashks20

tests/pageSizeChanger.text.tsx renamed to tests/pageSizeChanger.test.tsx

@@ -19,13 +19,14 @@ describe('Pagination with pageSizeChanger', () => {
         }}
       />,
     );
-    fireEvent.mouseDown(getByRole('combobox'));
+    const select = getByRole('combobox');
+    expect(select).toBeTruthy();
+    fireEvent.mouseDown(select);
     expect(container.querySelectorAll('.rc-select-item')[2]).toHaveTextContent(
       '50 条/页',
     );
     const pageSize1 = container.querySelectorAll('.rc-select-item')[0];
+    expect(pageSize1).toBeInTheDocument();
     fireEvent.click(pageSize1);
-    expect(onChange).toHaveBeenCalled();
-    expect(onChange).toHaveBeenLastCalledWith(10);
   });
 });