diff --git a/packages/web-react/src/components/FileUploader/__tests__/FileUploaderInput.test.tsx b/packages/web-react/src/components/FileUploader/__tests__/FileUploaderInput.test.tsx
index fa3fb71524..69df65ddeb 100644
--- a/packages/web-react/src/components/FileUploader/__tests__/FileUploaderInput.test.tsx
+++ b/packages/web-react/src/components/FileUploader/__tests__/FileUploaderInput.test.tsx
@@ -1,4 +1,4 @@
-import { render, screen, act } from '@testing-library/react';
+import { render, screen, act, fireEvent, waitFor } from '@testing-library/react';
 import React from 'react';
 import ReactDOMServer from 'react-dom/server';
 import { classNamePrefixProviderTest } from '../../../../tests/providerTests/classNamePrefixProviderTest';
@@ -15,9 +15,9 @@ describe('FileUploaderInput', () => {
   validationTextPropsTest(FileUploaderInput, '.FileUploaderInput__validationText');
 
   it('should have drag-and-drop listeners in CSR when draggable is supported', () => {
-    render(<FileUploaderInput id="test-uploader" name="test-uploader" label="upload" />);
+    render(<FileUploaderInput id="test-uploader" name="test-uploader" label="upload" data-testid="test" />);
 
-    const dropZone = screen.getByLabelText(/upload/i).parentElement;
+    const dropZone = screen.getAllByTestId('test')[0];
 
     expect(dropZone).toHaveAttribute('ondragover');
     expect(dropZone).toHaveAttribute('ondragenter');
@@ -26,7 +26,7 @@ describe('FileUploaderInput', () => {
   });
 
   it('should not have drag-and-drop listeners in SSR', () => {
-    const ui = <FileUploaderInput id="test-uploader" name="test-uploader" label="upload" />;
+    const ui = <FileUploaderInput id="test-uploader" name="test-uploader" label="upload" data-testid="test" />;
     const container = document.createElement('div');
     document.body.appendChild(container);
     container.innerHTML = ReactDOMServer.renderToString(ui);
@@ -35,7 +35,7 @@ describe('FileUploaderInput', () => {
       render(ui, { hydrate: true, container });
     });
 
-    const dropZone = screen.getByLabelText(/upload/i).parentElement;
+    const dropZone = screen.getAllByTestId('test')[0];
 
     expect(dropZone).not.toHaveAttribute('ondragover');
     expect(dropZone).not.toHaveAttribute('ondragenter');
@@ -43,3 +43,71 @@ describe('FileUploaderInput', () => {
     expect(dropZone).not.toHaveAttribute('ondrop');
   });
 });
+
+describe('Listener approach', () => {
+  it('should not register onDragOver event listener during SSR', () => {
+    // Simulace addEventListener pomocí jest.spyOn
+    const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
+
+    // Simulujeme SSR renderováním pouze komponenty bez vykonání useEffect
+    // Abychom simulovali SSR, renderování komponenty nebude obsahovat "hydration" logiku.
+    render(<FileUploaderInput name="bagr" id="pokus" data-testid="test" />, { hydrate: false });
+
+    // Ověřujeme, že event listener nebyl zaregistrován
+    expect(addEventListenerSpy).not.toHaveBeenCalledWith('dragover', expect.any(Function));
+
+    // Vyčistíme spy
+    addEventListenerSpy.mockRestore();
+  });
+
+  it('should register onDragOver event listener during CSR', () => {
+    const addEventListenerSpy = jest.spyOn(document, 'addEventListener');
+
+    // Simulujeme CSR renderováním komponenty s vykonáním useEffect
+    render(<FileUploaderInput name="bagr" id="pokus" data-testid="test" />, { hydrate: true });
+
+    expect(addEventListenerSpy).toHaveBeenCalledWith('dragover', expect.any(Function));
+
+    addEventListenerSpy.mockRestore();
+  });
+});
+
+describe('mock useeffect approach', () => {
+  it('should not register onDragOver event listener during SSR', () => {
+    jest.spyOn(React, 'useEffect').mockImplementation(() => {});
+    const addEventListenerSpy = jest.spyOn(window, 'addEventListener');
+
+    // Simulujeme SSR renderování komponenty
+    render(<FileUploaderInput name="bagr" id="pokus" data-testid="test" />);
+
+    // Kontrolujeme, že během SSR nebyl zaregistrován žádný onDragOver listener
+    expect(addEventListenerSpy).not.toHaveBeenCalledWith('dragover', expect.any(Function));
+
+    addEventListenerSpy.mockRestore();
+  });
+
+  it('should register onDragOver event listener during CSR', () => {
+    const addEventListenerSpy = jest.spyOn(window, 'addEventListener');
+
+    // Simulujeme CSR renderování komponenty
+    render(<FileUploaderInput name="bagr" id="pokus" data-testid="test" />);
+
+    // Kontrolujeme, že během CSR byl zaregistrován onDragOver listener
+    expect(addEventListenerSpy).toHaveBeenCalledWith('dragover', expect.any(Function));
+
+    addEventListenerSpy.mockRestore();
+  });
+});
+
+describe('is-dragging class on drag vent', () => {
+  it('should have is-dragging class on dragOver', () => {
+    render(<FileUploaderInput name="bagr" id="pokus" data-testid="test" />);
+    const dropZone = screen.getAllByTestId('test')[0];
+
+    fireEvent.dragOver(dropZone);
+
+    waitFor(() => {
+      expect(dropZone).toHaveClass('is-dragging');
+    });
+  });
+});