added unit tests

Author: Mash707

packages/react-core/src/components/Button/__tests__/Button.test.tsx

@@ -249,12 +249,27 @@ test(`Renders basic button`, () => {
   expect(asFragment()).toMatchSnapshot();
 });
 
-test('Renders favorite icon with class pf-m-favorite when isFavorited = false', () => {
+test(`Renders with class ${styles.modifiers.favorite} when isFavorite is true`, () => {
   render(<Button isFavorite />);
-  expect(screen.getByRole('button')).toHaveClass('pf-m-favorite');
+  expect(screen.getByRole('button')).toHaveClass(styles.modifiers.favorite);
 });
 
-test('Renders favorite icon with class pf-m-favorite when isFavorited = true', () => {
+test(`Renders with class ${styles.modifiers.favorited} when isFavorite is true and isFavorited is true`, () => {
   render(<Button isFavorite isFavorited />);
-  expect(screen.getByRole('button')).toHaveClass('pf-m-favorited');
+  expect(screen.getByRole('button')).toHaveClass(styles.modifiers.favorited);
+});
+
+test(`Does not render with class ${styles.modifiers.favorite} when isFavorite is false`, () => {
+  render(<Button />);
+  expect(screen.getByRole('button')).not.toHaveClass(styles.modifiers.favorite);
+});
+
+test(`Does not render with class ${styles.modifiers.favorited} when isFavorite is true and isFavorited is false`, () => {
+  render(<Button isFavorite />);
+  expect(screen.getByRole('button')).not.toHaveClass(styles.modifiers.favorited);
+});
+
+test('Overrides icon prop when isFavorite is true', () => {
+  render(<Button isFavorite icon={<div>Icon content</div>} />);
+  expect(screen.queryByText('Icon content')).not.toBeInTheDocument();
 });