chore: add unit tests for button

Author: markw-deriv

lib/components/Button/__test__/Button.spec.tsx

@@ -64,8 +64,8 @@ describe('Button component', () => {
   });
 
   it('applies the correct rounded class based on the "rounded" prop', () => {
-    const { container } = render(<Button rounded="lg">Test Button</Button>);
-    expect(container.firstChild).toHaveClass('deriv-button__rounded--lg');
+    const { container } = render(<Button rounded="md">Test Button</Button>);
+    expect(container.firstChild).toHaveClass('deriv-button__rounded--md');
   });
 
   it('shows the icon when provided and not loading', () => {

lib/components/Button/index.tsx

@@ -84,7 +84,7 @@ export const Button = ({
                 className,
             )}
             disabled={rest.disabled || isLoading}
-            aria-label={rest.children}
+            aria-label={rest.children && typeof rest.children === 'string' ? rest.children : ''}
             {...rest}
         >
             {isLoading && (