added test case for header button

client/src/workspace/HeaderButton/HeaderButton.test.js

@@ -0,0 +1,75 @@
+import React from 'react';
+import { render, fireEvent, screen } from '@testing-library/react';
+import HeaderButton from './index';
+import DownloadIcon from '@mui/icons-material/Download';
+import '@testing-library/jest-dom';
+
+// Mock useIconDictionary hook
+jest.mock('../icon-dictionary.js', () => ({
+  useIconDictionary: () => ({}), // Mocking an empty object since iconMapping is directly used
+}));
+
+describe('HeaderButton', () => {
+  it('renders button with icon and label', () => {
+    const handleClick = jest.fn();
+    render(
+      <HeaderButton
+        key={"download-button"}
+        name={"Download"}
+        label={"Download"}
+        onClick={handleClick}
+        icon={<DownloadIcon />}
+      />
+    );
+
+    // Verify icon
+    expect(screen.getByRole('button').querySelector('svg')).toBeInTheDocument();
+
+    // Verify label
+    expect(screen.getByText('Download')).toBeInTheDocument();
+
+    // Verify button is enabled
+    expect(screen.getByRole('button')).not.toBeDisabled();
+
+    // Click the button and verify onClick callback
+    fireEvent.click(screen.getByRole('button'));
+    expect(handleClick).toHaveBeenCalled();
+  });
+
+  it('renders button with custom icon', () => {
+    const handleClick = jest.fn();
+    render(
+      <HeaderButton
+        key={"custom-button"}
+        name={"Custom"}
+        label={"Custom"}
+        onClick={handleClick}
+        icon={<span data-testid="custom-icon">Custom Icon</span>}
+      />
+    );
+
+    // Verify custom icon
+    expect(screen.getByRole('button').querySelector('[data-testid="custom-icon"]')).toBeInTheDocument();
+  });
+
+  it('renders button as disabled', () => {
+    const handleClick = jest.fn();
+    render(
+      <HeaderButton
+        key={"disabled-button"}
+        name={"Disabled"}
+        label={"Disabled"}
+        onClick={handleClick}
+        disabled
+        icon={<DownloadIcon />}
+      />
+    );
+
+    // Verify button is disabled
+    expect(screen.getByRole('button')).toBeDisabled();
+
+    // Click should not invoke onClick callback
+    fireEvent.click(screen.getByRole('button'));
+    expect(handleClick).not.toHaveBeenCalled();
+  });
+});