test(webf): update webf_unit_test cases.

Author: CGQAQ

webf/test/src/css/inline_style_blink_fastpath_test.dart

@@ -52,9 +52,9 @@ void main() {
     box.setInlineStyle('fontSize', '-1px');
     expect(box.style.getPropertyValue('fontSize'), equals('16px'));
 
-    // Native-side (Blink) validated values should bypass Dart validation.
+    // Native-side (Blink) did not validating inline values thus should not bypass Dart validation.
     box.setInlineStyle('fontSize', '-2px', fromNative: true);
-    expect(box.style.getPropertyValue('fontSize'), equals('-2px'));
+    expect(box.style.getPropertyValue('fontSize'), equals('16px'));
   });
 
   testWidgets('Negative padding from native does not crash layout', (WidgetTester tester) async {
@@ -75,7 +75,8 @@ void main() {
 
     final box = prepared.getElementById('box');
     box.setInlineStyle('paddingBottom', '-10px', fromNative: true);
-    expect(box.style.getPropertyValue('paddingBottom'), equals('-10px'));
+    // negative paddings are invalid, and should not be set.
+    expect(box.style.getPropertyValue('paddingBottom'), equals(''));
 
     await tester.pump();
     await tester.pump(const Duration(milliseconds: 50));