test(background-image): remove unecessary tests

Author: zeroedin

elements/pf-v6-background-image/README.md

@@ -17,7 +17,3 @@ The element uses fixed positioning and sits behind all other content at `z-index
 | React prop  | Notes                                          |
 |-------------|-------------------------------------------------|
 | `className` | Not needed; shadow DOM provides encapsulation. |
-
-### Changed API
-
-No changed APIs. The `src` attribute maps directly to the React `src` prop.

elements/pf-v6-background-image/test/pf-background-image.spec.ts

@@ -48,20 +48,6 @@ describe('<pf-v6-background-image>', function() {
       expect(styles.getPropertyValue('background-image')).to.contain('/test/image.jpg');
     });
 
-    it('should reflect src attribute', function() {
-      expect(element.getAttribute('src')).to.equal('/test/image.jpg');
-    });
-
-    it('should use fixed positioning', function() {
-      const styles = getComputedStyle(element);
-      expect(styles.position).to.equal('fixed');
-    });
-
-    it('should have a negative z-index', function() {
-      const styles = getComputedStyle(element);
-      expect(Number(styles.zIndex)).to.be.lessThan(0);
-    });
-
     it('should update background image when src changes dynamically', async function() {
       element.src = '/test/other-image.jpg';
       await element.updateComplete;